mirror of https://github.com/hak5/openwrt.git
853 lines
29 KiB
Diff
853 lines
29 KiB
Diff
From 9b2c282b348dfe966bbba967dc7a45ce817cce50 Mon Sep 17 00:00:00 2001
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From: Tom Rini <trini@konsulko.com>
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Date: Mon, 29 Feb 2016 11:34:15 -0500
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Subject: [PATCH] compiler*.h: sync include/linux/compiler*.h with Linux
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4.5-rc6
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Copy these from Linux v4.5-rc6 tag.
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This is needed so that we can keep up with newer gcc versions. Note
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that we don't have the uapi/ hierarchy from the kernel so continue to
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use <linux/types.h>
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Signed-off-by: Tom Rini <trini@konsulko.com>
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---
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include/linux/compiler-gcc.h | 266 ++++++++++++++++++++++++++++++++++------
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include/linux/compiler-gcc3.h | 21 ----
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include/linux/compiler-gcc4.h | 63 ----------
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include/linux/compiler-intel.h | 45 +++++++
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include/linux/compiler.h | 270 +++++++++++++++++++++++++++++++++++++++--
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5 files changed, 534 insertions(+), 131 deletions(-)
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delete mode 100644 include/linux/compiler-gcc3.h
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delete mode 100644 include/linux/compiler-gcc4.h
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create mode 100644 include/linux/compiler-intel.h
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diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
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index 9896e54..22ab246 100644
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--- a/include/linux/compiler-gcc.h
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+++ b/include/linux/compiler-gcc.h
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@@ -5,11 +5,28 @@
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/*
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* Common definitions for all gcc versions go here.
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*/
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-
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+#define GCC_VERSION (__GNUC__ * 10000 \
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+ + __GNUC_MINOR__ * 100 \
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+ + __GNUC_PATCHLEVEL__)
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/* Optimization barrier */
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+
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/* The "volatile" is due to gcc bugs */
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#define barrier() __asm__ __volatile__("": : :"memory")
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+/*
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+ * This version is i.e. to prevent dead stores elimination on @ptr
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+ * where gcc and llvm may behave differently when otherwise using
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+ * normal barrier(): while gcc behavior gets along with a normal
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+ * barrier(), llvm needs an explicit input variable to be assumed
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+ * clobbered. The issue is as follows: while the inline asm might
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+ * access any memory it wants, the compiler could have fit all of
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+ * @ptr into memory registers instead, and since @ptr never escaped
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+ * from that, it proofed that the inline asm wasn't touching any of
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+ * it. This version works well with both compilers, i.e. we're telling
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+ * the compiler that the inline asm absolutely may see the contents
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+ * of @ptr. See also: https://llvm.org/bugs/show_bug.cgi?id=15495
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+ */
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+#define barrier_data(ptr) __asm__ __volatile__("": :"r"(ptr) :"memory")
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/*
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* This macro obfuscates arithmetic on a variable address so that gcc
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@@ -29,41 +46,63 @@
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* the inline assembly constraint from =g to =r, in this particular
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* case either is valid.
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*/
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-#define RELOC_HIDE(ptr, off) \
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- ({ unsigned long __ptr; \
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- __asm__ ("" : "=r"(__ptr) : "0"(ptr)); \
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- (typeof(ptr)) (__ptr + (off)); })
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+#define RELOC_HIDE(ptr, off) \
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+({ \
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+ unsigned long __ptr; \
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+ __asm__ ("" : "=r"(__ptr) : "0"(ptr)); \
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+ (typeof(ptr)) (__ptr + (off)); \
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+})
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+
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+/* Make the optimizer believe the variable can be manipulated arbitrarily. */
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+#define OPTIMIZER_HIDE_VAR(var) \
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+ __asm__ ("" : "=r" (var) : "0" (var))
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+#ifdef __CHECKER__
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+#define __must_be_array(a) 0
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+#else
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/* &a[0] degrades to a pointer: a different type from an array */
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-#define __must_be_array(a) \
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- BUILD_BUG_ON_ZERO(__builtin_types_compatible_p(typeof(a), typeof(&a[0])))
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+#define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
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+#endif
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/*
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* Force always-inline if the user requests it so via the .config,
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* or if gcc is too old:
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*/
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-#if !defined(CONFIG_ARCH_SUPPORTS_OPTIMIZED_INLINING) || \
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+#if !defined(CONFIG_ARCH_SUPPORTS_OPTIMIZED_INLINING) || \
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!defined(CONFIG_OPTIMIZE_INLINING) || (__GNUC__ < 4)
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-# define inline inline __attribute__((always_inline))
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-# define __inline__ __inline__ __attribute__((always_inline))
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-# define __inline __inline __attribute__((always_inline))
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+#define inline inline __attribute__((always_inline)) notrace
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+#define __inline__ __inline__ __attribute__((always_inline)) notrace
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+#define __inline __inline __attribute__((always_inline)) notrace
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+#else
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+/* A lot of inline functions can cause havoc with function tracing */
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+#define inline inline notrace
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+#define __inline__ __inline__ notrace
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+#define __inline __inline notrace
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#endif
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-#define __deprecated __attribute__((deprecated))
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-#ifndef __packed
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-# define __packed __attribute__((packed))
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-#endif
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-#define __weak __attribute__((weak))
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+#define __always_inline inline __attribute__((always_inline))
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+#define noinline __attribute__((noinline))
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+
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+#define __deprecated __attribute__((deprecated))
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+#define __packed __attribute__((packed))
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+#define __weak __attribute__((weak))
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+#define __alias(symbol) __attribute__((alias(#symbol)))
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/*
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- * it doesn't make sense on ARM (currently the only user of __naked) to trace
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- * naked functions because then mcount is called without stack and frame pointer
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- * being set up and there is no chance to restore the lr register to the value
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- * before mcount was called.
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+ * it doesn't make sense on ARM (currently the only user of __naked)
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+ * to trace naked functions because then mcount is called without
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+ * stack and frame pointer being set up and there is no chance to
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+ * restore the lr register to the value before mcount was called.
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+ *
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+ * The asm() bodies of naked functions often depend on standard calling
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+ * conventions, therefore they must be noinline and noclone.
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+ *
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+ * GCC 4.[56] currently fail to enforce this, so we must do so ourselves.
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+ * See GCC PR44290.
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*/
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-#define __naked __attribute__((naked)) notrace
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+#define __naked __attribute__((naked)) noinline __noclone notrace
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-#define __noreturn __attribute__((noreturn))
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+#define __noreturn __attribute__((noreturn))
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/*
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* From the GCC manual:
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@@ -75,19 +114,170 @@
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* would be.
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* [...]
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*/
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-#ifndef __pure
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-# define __pure __attribute__((pure))
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-#endif
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-#ifndef __aligned
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-# define __aligned(x) __attribute__((aligned(x)))
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-#endif
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-#define __printf(a,b) __attribute__((format(printf,a,b)))
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-#define noinline __attribute__((noinline))
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-#define __attribute_const__ __attribute__((__const__))
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-#define __maybe_unused __attribute__((unused))
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-#define __always_unused __attribute__((unused))
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-
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-#define __gcc_header(x) #x
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-#define _gcc_header(x) __gcc_header(linux/compiler-gcc##x.h)
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-#define gcc_header(x) _gcc_header(x)
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-#include gcc_header(__GNUC__)
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+#define __pure __attribute__((pure))
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+#define __aligned(x) __attribute__((aligned(x)))
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+#define __printf(a, b) __attribute__((format(printf, a, b)))
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+#define __scanf(a, b) __attribute__((format(scanf, a, b)))
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+#define __attribute_const__ __attribute__((__const__))
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+#define __maybe_unused __attribute__((unused))
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+#define __always_unused __attribute__((unused))
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+
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+/* gcc version specific checks */
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+
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+#if GCC_VERSION < 30200
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+# error Sorry, your compiler is too old - please upgrade it.
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+#endif
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+
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+#if GCC_VERSION < 30300
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+# define __used __attribute__((__unused__))
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+#else
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+# define __used __attribute__((__used__))
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+#endif
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+
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+#ifdef CONFIG_GCOV_KERNEL
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+# if GCC_VERSION < 30400
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+# error "GCOV profiling support for gcc versions below 3.4 not included"
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+# endif /* __GNUC_MINOR__ */
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+#endif /* CONFIG_GCOV_KERNEL */
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+
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+#if GCC_VERSION >= 30400
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+#define __must_check __attribute__((warn_unused_result))
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+#endif
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+
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+#if GCC_VERSION >= 40000
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+
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+/* GCC 4.1.[01] miscompiles __weak */
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+#ifdef __KERNEL__
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+# if GCC_VERSION >= 40100 && GCC_VERSION <= 40101
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+# error Your version of gcc miscompiles the __weak directive
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+# endif
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+#endif
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+
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+#define __used __attribute__((__used__))
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+#define __compiler_offsetof(a, b) \
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+ __builtin_offsetof(a, b)
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+
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+#if GCC_VERSION >= 40100 && GCC_VERSION < 40600
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+# define __compiletime_object_size(obj) __builtin_object_size(obj, 0)
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+#endif
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+
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+#if GCC_VERSION >= 40300
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+/* Mark functions as cold. gcc will assume any path leading to a call
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+ * to them will be unlikely. This means a lot of manual unlikely()s
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+ * are unnecessary now for any paths leading to the usual suspects
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+ * like BUG(), printk(), panic() etc. [but let's keep them for now for
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+ * older compilers]
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+ *
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+ * Early snapshots of gcc 4.3 don't support this and we can't detect this
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+ * in the preprocessor, but we can live with this because they're unreleased.
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+ * Maketime probing would be overkill here.
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+ *
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+ * gcc also has a __attribute__((__hot__)) to move hot functions into
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+ * a special section, but I don't see any sense in this right now in
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+ * the kernel context
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+ */
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+#define __cold __attribute__((__cold__))
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+
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+#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
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+
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+#ifndef __CHECKER__
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+# define __compiletime_warning(message) __attribute__((warning(message)))
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+# define __compiletime_error(message) __attribute__((error(message)))
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+#endif /* __CHECKER__ */
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+#endif /* GCC_VERSION >= 40300 */
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+
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+#if GCC_VERSION >= 40500
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+/*
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+ * Mark a position in code as unreachable. This can be used to
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+ * suppress control flow warnings after asm blocks that transfer
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+ * control elsewhere.
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+ *
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+ * Early snapshots of gcc 4.5 don't support this and we can't detect
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+ * this in the preprocessor, but we can live with this because they're
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+ * unreleased. Really, we need to have autoconf for the kernel.
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+ */
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+#define unreachable() __builtin_unreachable()
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+
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+/* Mark a function definition as prohibited from being cloned. */
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+#define __noclone __attribute__((__noclone__))
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+
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+#endif /* GCC_VERSION >= 40500 */
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+
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+#if GCC_VERSION >= 40600
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+/*
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+ * When used with Link Time Optimization, gcc can optimize away C functions or
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+ * variables which are referenced only from assembly code. __visible tells the
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+ * optimizer that something else uses this function or variable, thus preventing
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+ * this.
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+ */
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+#define __visible __attribute__((externally_visible))
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+#endif
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+
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+
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+#if GCC_VERSION >= 40900 && !defined(__CHECKER__)
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+/*
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+ * __assume_aligned(n, k): Tell the optimizer that the returned
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+ * pointer can be assumed to be k modulo n. The second argument is
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+ * optional (default 0), so we use a variadic macro to make the
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+ * shorthand.
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+ *
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+ * Beware: Do not apply this to functions which may return
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+ * ERR_PTRs. Also, it is probably unwise to apply it to functions
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+ * returning extra information in the low bits (but in that case the
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+ * compiler should see some alignment anyway, when the return value is
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+ * massaged by 'flags = ptr & 3; ptr &= ~3;').
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+ */
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+#define __assume_aligned(a, ...) __attribute__((__assume_aligned__(a, ## __VA_ARGS__)))
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+#endif
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+
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+/*
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+ * GCC 'asm goto' miscompiles certain code sequences:
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+ *
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+ * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670
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+ *
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+ * Work it around via a compiler barrier quirk suggested by Jakub Jelinek.
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+ *
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+ * (asm goto is automatically volatile - the naming reflects this.)
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+ */
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+#define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0)
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+
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+#ifdef CONFIG_ARCH_USE_BUILTIN_BSWAP
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+#if GCC_VERSION >= 40400
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+#define __HAVE_BUILTIN_BSWAP32__
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+#define __HAVE_BUILTIN_BSWAP64__
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+#endif
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+#if GCC_VERSION >= 40800 || (defined(__powerpc__) && GCC_VERSION >= 40600)
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+#define __HAVE_BUILTIN_BSWAP16__
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+#endif
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+#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */
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+
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+#if GCC_VERSION >= 50000
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+#define KASAN_ABI_VERSION 4
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+#elif GCC_VERSION >= 40902
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+#define KASAN_ABI_VERSION 3
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+#endif
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+
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+#if GCC_VERSION >= 40902
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+/*
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+ * Tell the compiler that address safety instrumentation (KASAN)
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+ * should not be applied to that function.
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+ * Conflicts with inlining: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67368
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+ */
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+#define __no_sanitize_address __attribute__((no_sanitize_address))
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+#endif
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+
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+#endif /* gcc version >= 40000 specific checks */
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+
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+#if !defined(__noclone)
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+#define __noclone /* not needed */
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+#endif
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+
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+#if !defined(__no_sanitize_address)
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+#define __no_sanitize_address
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+#endif
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+
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+/*
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+ * A trick to suppress uninitialized variable warning without generating any
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+ * code
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+ */
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+#define uninitialized_var(x) x = x
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diff --git a/include/linux/compiler-gcc3.h b/include/linux/compiler-gcc3.h
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deleted file mode 100644
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index 2befe65..0000000
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--- a/include/linux/compiler-gcc3.h
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+++ /dev/null
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@@ -1,21 +0,0 @@
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-#ifndef __LINUX_COMPILER_H
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-#error "Please don't include <linux/compiler-gcc3.h> directly, include <linux/compiler.h> instead."
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-#endif
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-
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-#if __GNUC_MINOR__ >= 3
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-# define __used __attribute__((__used__))
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-#else
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-# define __used __attribute__((__unused__))
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-#endif
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-
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-#if __GNUC_MINOR__ >= 4
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-#define __must_check __attribute__((warn_unused_result))
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-#endif
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-
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-/*
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- * A trick to suppress uninitialized variable warning without generating any
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- * code
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- */
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-#define uninitialized_var(x) x = x
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-
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-#define __always_inline inline __attribute__((always_inline))
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diff --git a/include/linux/compiler-gcc4.h b/include/linux/compiler-gcc4.h
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deleted file mode 100644
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index 27d11ca..0000000
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--- a/include/linux/compiler-gcc4.h
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+++ /dev/null
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@@ -1,63 +0,0 @@
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-#ifndef __LINUX_COMPILER_H
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-#error "Please don't include <linux/compiler-gcc4.h> directly, include <linux/compiler.h> instead."
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-#endif
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-
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-/* GCC 4.1.[01] miscompiles __weak */
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-#ifdef __KERNEL__
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-# if __GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ <= 1
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-# error Your version of gcc miscompiles the __weak directive
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-# endif
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-#endif
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-
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-#define __used __attribute__((__used__))
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-#define __must_check __attribute__((warn_unused_result))
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-#define __compiler_offsetof(a,b) __builtin_offsetof(a,b)
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-#ifndef __always_inline
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-# define __always_inline inline __attribute__((always_inline))
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-#endif
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|
-
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-/*
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- * A trick to suppress uninitialized variable warning without generating any
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- * code
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- */
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-#define uninitialized_var(x) x = x
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-
|
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-#if __GNUC_MINOR__ >= 3
|
|
-/* Mark functions as cold. gcc will assume any path leading to a call
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|
- to them will be unlikely. This means a lot of manual unlikely()s
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|
- are unnecessary now for any paths leading to the usual suspects
|
|
- like BUG(), printk(), panic() etc. [but let's keep them for now for
|
|
- older compilers]
|
|
-
|
|
- Early snapshots of gcc 4.3 don't support this and we can't detect this
|
|
- in the preprocessor, but we can live with this because they're unreleased.
|
|
- Maketime probing would be overkill here.
|
|
-
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|
- gcc also has a __attribute__((__hot__)) to move hot functions into
|
|
- a special section, but I don't see any sense in this right now in
|
|
- the kernel context */
|
|
-#define __cold __attribute__((__cold__))
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|
-
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|
-
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-#if __GNUC_MINOR__ >= 5
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-/*
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|
- * Mark a position in code as unreachable. This can be used to
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|
- * suppress control flow warnings after asm blocks that transfer
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|
- * control elsewhere.
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|
- *
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|
- * Early snapshots of gcc 4.5 don't support this and we can't detect
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|
- * this in the preprocessor, but we can live with this because they're
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- * unreleased. Really, we need to have autoconf for the kernel.
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- */
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-#define unreachable() __builtin_unreachable()
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-#endif
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-
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-#endif
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-
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-#if __GNUC_MINOR__ > 0
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-#define __compiletime_object_size(obj) __builtin_object_size(obj, 0)
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-#endif
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-#if __GNUC_MINOR__ >= 4
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-#define __compiletime_warning(message) __attribute__((warning(message)))
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-#define __compiletime_error(message) __attribute__((error(message)))
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-#endif
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diff --git a/include/linux/compiler-intel.h b/include/linux/compiler-intel.h
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new file mode 100644
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|
index 0000000..d4c7113
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|
--- /dev/null
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|
+++ b/include/linux/compiler-intel.h
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|
@@ -0,0 +1,45 @@
|
|
+#ifndef __LINUX_COMPILER_H
|
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+#error "Please don't include <linux/compiler-intel.h> directly, include <linux/compiler.h> instead."
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+#endif
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+
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+#ifdef __ECC
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+
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|
+/* Some compiler specific definitions are overwritten here
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+ * for Intel ECC compiler
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+ */
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+
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+#include <asm/intrinsics.h>
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+
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+/* Intel ECC compiler doesn't support gcc specific asm stmts.
|
|
+ * It uses intrinsics to do the equivalent things.
|
|
+ */
|
|
+#undef barrier
|
|
+#undef barrier_data
|
|
+#undef RELOC_HIDE
|
|
+#undef OPTIMIZER_HIDE_VAR
|
|
+
|
|
+#define barrier() __memory_barrier()
|
|
+#define barrier_data(ptr) barrier()
|
|
+
|
|
+#define RELOC_HIDE(ptr, off) \
|
|
+ ({ unsigned long __ptr; \
|
|
+ __ptr = (unsigned long) (ptr); \
|
|
+ (typeof(ptr)) (__ptr + (off)); })
|
|
+
|
|
+/* This should act as an optimization barrier on var.
|
|
+ * Given that this compiler does not have inline assembly, a compiler barrier
|
|
+ * is the best we can do.
|
|
+ */
|
|
+#define OPTIMIZER_HIDE_VAR(var) barrier()
|
|
+
|
|
+/* Intel ECC compiler doesn't support __builtin_types_compatible_p() */
|
|
+#define __must_be_array(a) 0
|
|
+
|
|
+#endif
|
|
+
|
|
+#ifndef __HAVE_BUILTIN_BSWAP16__
|
|
+/* icc has this, but it's called _bswap16 */
|
|
+#define __HAVE_BUILTIN_BSWAP16__
|
|
+#define __builtin_bswap16 _bswap16
|
|
+#endif
|
|
+
|
|
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
|
|
index 5be3dab..020ad16 100644
|
|
--- a/include/linux/compiler.h
|
|
+++ b/include/linux/compiler.h
|
|
@@ -5,16 +5,24 @@
|
|
|
|
#ifdef __CHECKER__
|
|
# define __user __attribute__((noderef, address_space(1)))
|
|
-# define __kernel /* default address space */
|
|
+# define __kernel __attribute__((address_space(0)))
|
|
# define __safe __attribute__((safe))
|
|
# define __force __attribute__((force))
|
|
# define __nocast __attribute__((nocast))
|
|
# define __iomem __attribute__((noderef, address_space(2)))
|
|
+# define __must_hold(x) __attribute__((context(x,1,1)))
|
|
# define __acquires(x) __attribute__((context(x,0,1)))
|
|
# define __releases(x) __attribute__((context(x,1,0)))
|
|
# define __acquire(x) __context__(x,1)
|
|
# define __release(x) __context__(x,-1)
|
|
# define __cond_lock(x,c) ((c) ? ({ __acquire(x); 1; }) : 0)
|
|
+# define __percpu __attribute__((noderef, address_space(3)))
|
|
+# define __pmem __attribute__((noderef, address_space(5)))
|
|
+#ifdef CONFIG_SPARSE_RCU_POINTER
|
|
+# define __rcu __attribute__((noderef, address_space(4)))
|
|
+#else
|
|
+# define __rcu
|
|
+#endif
|
|
extern void __chk_user_ptr(const volatile void __user *);
|
|
extern void __chk_io_ptr(const volatile void __iomem *);
|
|
#else
|
|
@@ -27,20 +35,32 @@ extern void __chk_io_ptr(const volatile void __iomem *);
|
|
# define __chk_user_ptr(x) (void)0
|
|
# define __chk_io_ptr(x) (void)0
|
|
# define __builtin_warning(x, y...) (1)
|
|
+# define __must_hold(x)
|
|
# define __acquires(x)
|
|
# define __releases(x)
|
|
# define __acquire(x) (void)0
|
|
# define __release(x) (void)0
|
|
# define __cond_lock(x,c) (c)
|
|
+# define __percpu
|
|
+# define __rcu
|
|
+# define __pmem
|
|
#endif
|
|
|
|
+/* Indirect macros required for expanded argument pasting, eg. __LINE__. */
|
|
+#define ___PASTE(a,b) a##b
|
|
+#define __PASTE(a,b) ___PASTE(a,b)
|
|
+
|
|
#ifdef __KERNEL__
|
|
|
|
#ifdef __GNUC__
|
|
#include <linux/compiler-gcc.h>
|
|
#endif
|
|
|
|
+#if defined(CC_USING_HOTPATCH) && !defined(__CHECKER__)
|
|
+#define notrace __attribute__((hotpatch(0,0)))
|
|
+#else
|
|
#define notrace __attribute__((no_instrument_function))
|
|
+#endif
|
|
|
|
/* Intel compiler defines __GNUC__. So we will overwrite implementations
|
|
* coming from above header files here
|
|
@@ -49,6 +69,13 @@ extern void __chk_io_ptr(const volatile void __iomem *);
|
|
# include <linux/compiler-intel.h>
|
|
#endif
|
|
|
|
+/* Clang compiler defines __GNUC__. So we will overwrite implementations
|
|
+ * coming from above header files here
|
|
+ */
|
|
+#ifdef __clang__
|
|
+#include <linux/compiler-clang.h>
|
|
+#endif
|
|
+
|
|
/*
|
|
* Generic compiler-dependent macros required for kernel
|
|
* build go below this comment. Actual compiler/compiler version
|
|
@@ -117,7 +144,7 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);
|
|
*/
|
|
#define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )
|
|
#define __trace_if(cond) \
|
|
- if (__builtin_constant_p((cond)) ? !!(cond) : \
|
|
+ if (__builtin_constant_p(!!(cond)) ? !!(cond) : \
|
|
({ \
|
|
int ______r; \
|
|
static struct ftrace_branch_data \
|
|
@@ -144,6 +171,10 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);
|
|
# define barrier() __memory_barrier()
|
|
#endif
|
|
|
|
+#ifndef barrier_data
|
|
+# define barrier_data(ptr) barrier()
|
|
+#endif
|
|
+
|
|
/* Unreachable code */
|
|
#ifndef unreachable
|
|
# define unreachable() do { } while (1)
|
|
@@ -156,6 +187,135 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);
|
|
(typeof(ptr)) (__ptr + (off)); })
|
|
#endif
|
|
|
|
+#ifndef OPTIMIZER_HIDE_VAR
|
|
+#define OPTIMIZER_HIDE_VAR(var) barrier()
|
|
+#endif
|
|
+
|
|
+/* Not-quite-unique ID. */
|
|
+#ifndef __UNIQUE_ID
|
|
+# define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __LINE__)
|
|
+#endif
|
|
+
|
|
+#include <linux/types.h>
|
|
+
|
|
+#define __READ_ONCE_SIZE \
|
|
+({ \
|
|
+ switch (size) { \
|
|
+ case 1: *(__u8 *)res = *(volatile __u8 *)p; break; \
|
|
+ case 2: *(__u16 *)res = *(volatile __u16 *)p; break; \
|
|
+ case 4: *(__u32 *)res = *(volatile __u32 *)p; break; \
|
|
+ case 8: *(__u64 *)res = *(volatile __u64 *)p; break; \
|
|
+ default: \
|
|
+ barrier(); \
|
|
+ __builtin_memcpy((void *)res, (const void *)p, size); \
|
|
+ barrier(); \
|
|
+ } \
|
|
+})
|
|
+
|
|
+static __always_inline
|
|
+void __read_once_size(const volatile void *p, void *res, int size)
|
|
+{
|
|
+ __READ_ONCE_SIZE;
|
|
+}
|
|
+
|
|
+#ifdef CONFIG_KASAN
|
|
+/*
|
|
+ * This function is not 'inline' because __no_sanitize_address confilcts
|
|
+ * with inlining. Attempt to inline it may cause a build failure.
|
|
+ * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67368
|
|
+ * '__maybe_unused' allows us to avoid defined-but-not-used warnings.
|
|
+ */
|
|
+static __no_sanitize_address __maybe_unused
|
|
+void __read_once_size_nocheck(const volatile void *p, void *res, int size)
|
|
+{
|
|
+ __READ_ONCE_SIZE;
|
|
+}
|
|
+#else
|
|
+static __always_inline
|
|
+void __read_once_size_nocheck(const volatile void *p, void *res, int size)
|
|
+{
|
|
+ __READ_ONCE_SIZE;
|
|
+}
|
|
+#endif
|
|
+
|
|
+static __always_inline void __write_once_size(volatile void *p, void *res, int size)
|
|
+{
|
|
+ switch (size) {
|
|
+ case 1: *(volatile __u8 *)p = *(__u8 *)res; break;
|
|
+ case 2: *(volatile __u16 *)p = *(__u16 *)res; break;
|
|
+ case 4: *(volatile __u32 *)p = *(__u32 *)res; break;
|
|
+ case 8: *(volatile __u64 *)p = *(__u64 *)res; break;
|
|
+ default:
|
|
+ barrier();
|
|
+ __builtin_memcpy((void *)p, (const void *)res, size);
|
|
+ barrier();
|
|
+ }
|
|
+}
|
|
+
|
|
+/*
|
|
+ * Prevent the compiler from merging or refetching reads or writes. The
|
|
+ * compiler is also forbidden from reordering successive instances of
|
|
+ * READ_ONCE, WRITE_ONCE and ACCESS_ONCE (see below), but only when the
|
|
+ * compiler is aware of some particular ordering. One way to make the
|
|
+ * compiler aware of ordering is to put the two invocations of READ_ONCE,
|
|
+ * WRITE_ONCE or ACCESS_ONCE() in different C statements.
|
|
+ *
|
|
+ * In contrast to ACCESS_ONCE these two macros will also work on aggregate
|
|
+ * data types like structs or unions. If the size of the accessed data
|
|
+ * type exceeds the word size of the machine (e.g., 32 bits or 64 bits)
|
|
+ * READ_ONCE() and WRITE_ONCE() will fall back to memcpy and print a
|
|
+ * compile-time warning.
|
|
+ *
|
|
+ * Their two major use cases are: (1) Mediating communication between
|
|
+ * process-level code and irq/NMI handlers, all running on the same CPU,
|
|
+ * and (2) Ensuring that the compiler does not fold, spindle, or otherwise
|
|
+ * mutilate accesses that either do not require ordering or that interact
|
|
+ * with an explicit memory barrier or atomic instruction that provides the
|
|
+ * required ordering.
|
|
+ */
|
|
+
|
|
+#define __READ_ONCE(x, check) \
|
|
+({ \
|
|
+ union { typeof(x) __val; char __c[1]; } __u; \
|
|
+ if (check) \
|
|
+ __read_once_size(&(x), __u.__c, sizeof(x)); \
|
|
+ else \
|
|
+ __read_once_size_nocheck(&(x), __u.__c, sizeof(x)); \
|
|
+ __u.__val; \
|
|
+})
|
|
+#define READ_ONCE(x) __READ_ONCE(x, 1)
|
|
+
|
|
+/*
|
|
+ * Use READ_ONCE_NOCHECK() instead of READ_ONCE() if you need
|
|
+ * to hide memory access from KASAN.
|
|
+ */
|
|
+#define READ_ONCE_NOCHECK(x) __READ_ONCE(x, 0)
|
|
+
|
|
+#define WRITE_ONCE(x, val) \
|
|
+({ \
|
|
+ union { typeof(x) __val; char __c[1]; } __u = \
|
|
+ { .__val = (__force typeof(x)) (val) }; \
|
|
+ __write_once_size(&(x), __u.__c, sizeof(x)); \
|
|
+ __u.__val; \
|
|
+})
|
|
+
|
|
+/**
|
|
+ * smp_cond_acquire() - Spin wait for cond with ACQUIRE ordering
|
|
+ * @cond: boolean expression to wait for
|
|
+ *
|
|
+ * Equivalent to using smp_load_acquire() on the condition variable but employs
|
|
+ * the control dependency of the wait to reduce the barrier on many platforms.
|
|
+ *
|
|
+ * The control dependency provides a LOAD->STORE order, the additional RMB
|
|
+ * provides LOAD->LOAD order, together they provide LOAD->{LOAD,STORE} order,
|
|
+ * aka. ACQUIRE.
|
|
+ */
|
|
+#define smp_cond_acquire(cond) do { \
|
|
+ while (!(cond)) \
|
|
+ cpu_relax(); \
|
|
+ smp_rmb(); /* ctrl + rmb := acquire */ \
|
|
+} while (0)
|
|
+
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
@@ -228,7 +388,7 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);
|
|
|
|
/*
|
|
* Rather then using noinline to prevent stack consumption, use
|
|
- * noinline_for_stack instead. For documentaiton reasons.
|
|
+ * noinline_for_stack instead. For documentation reasons.
|
|
*/
|
|
#define noinline_for_stack noinline
|
|
|
|
@@ -270,11 +430,28 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);
|
|
# define __section(S) __attribute__ ((__section__(#S)))
|
|
#endif
|
|
|
|
+#ifndef __visible
|
|
+#define __visible
|
|
+#endif
|
|
+
|
|
+/*
|
|
+ * Assume alignment of return value.
|
|
+ */
|
|
+#ifndef __assume_aligned
|
|
+#define __assume_aligned(a, ...)
|
|
+#endif
|
|
+
|
|
+
|
|
/* Are two types/vars the same type (ignoring qualifiers)? */
|
|
#ifndef __same_type
|
|
# define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
|
|
#endif
|
|
|
|
+/* Is this type a native word size -- useful for atomic operations */
|
|
+#ifndef __native_word
|
|
+# define __native_word(t) (sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || sizeof(t) == sizeof(int) || sizeof(t) == sizeof(long))
|
|
+#endif
|
|
+
|
|
/* Compile time object size, -1 for unknown */
|
|
#ifndef __compiletime_object_size
|
|
# define __compiletime_object_size(obj) -1
|
|
@@ -284,7 +461,48 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);
|
|
#endif
|
|
#ifndef __compiletime_error
|
|
# define __compiletime_error(message)
|
|
+/*
|
|
+ * Sparse complains of variable sized arrays due to the temporary variable in
|
|
+ * __compiletime_assert. Unfortunately we can't just expand it out to make
|
|
+ * sparse see a constant array size without breaking compiletime_assert on old
|
|
+ * versions of GCC (e.g. 4.2.4), so hide the array from sparse altogether.
|
|
+ */
|
|
+# ifndef __CHECKER__
|
|
+# define __compiletime_error_fallback(condition) \
|
|
+ do { ((void)sizeof(char[1 - 2 * condition])); } while (0)
|
|
+# endif
|
|
#endif
|
|
+#ifndef __compiletime_error_fallback
|
|
+# define __compiletime_error_fallback(condition) do { } while (0)
|
|
+#endif
|
|
+
|
|
+#define __compiletime_assert(condition, msg, prefix, suffix) \
|
|
+ do { \
|
|
+ bool __cond = !(condition); \
|
|
+ extern void prefix ## suffix(void) __compiletime_error(msg); \
|
|
+ if (__cond) \
|
|
+ prefix ## suffix(); \
|
|
+ __compiletime_error_fallback(__cond); \
|
|
+ } while (0)
|
|
+
|
|
+#define _compiletime_assert(condition, msg, prefix, suffix) \
|
|
+ __compiletime_assert(condition, msg, prefix, suffix)
|
|
+
|
|
+/**
|
|
+ * compiletime_assert - break build and emit msg if condition is false
|
|
+ * @condition: a compile-time constant condition to check
|
|
+ * @msg: a message to emit if condition is false
|
|
+ *
|
|
+ * In tradition of POSIX assert, this macro will break the build if the
|
|
+ * supplied condition is *false*, emitting the supplied error message if the
|
|
+ * compiler has support to do so.
|
|
+ */
|
|
+#define compiletime_assert(condition, msg) \
|
|
+ _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
|
|
+
|
|
+#define compiletime_assert_atomic_type(t) \
|
|
+ compiletime_assert(__native_word(t), \
|
|
+ "Need native word sized stores/loads for atomicity.")
|
|
|
|
/*
|
|
* Prevent the compiler from merging or refetching accesses. The compiler
|
|
@@ -293,11 +511,45 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);
|
|
* to make the compiler aware of ordering is to put the two invocations of
|
|
* ACCESS_ONCE() in different C statements.
|
|
*
|
|
- * This macro does absolutely -nothing- to prevent the CPU from reordering,
|
|
- * merging, or refetching absolutely anything at any time. Its main intended
|
|
- * use is to mediate communication between process-level code and irq/NMI
|
|
- * handlers, all running on the same CPU.
|
|
+ * ACCESS_ONCE will only work on scalar types. For union types, ACCESS_ONCE
|
|
+ * on a union member will work as long as the size of the member matches the
|
|
+ * size of the union and the size is smaller than word size.
|
|
+ *
|
|
+ * The major use cases of ACCESS_ONCE used to be (1) Mediating communication
|
|
+ * between process-level code and irq/NMI handlers, all running on the same CPU,
|
|
+ * and (2) Ensuring that the compiler does not fold, spindle, or otherwise
|
|
+ * mutilate accesses that either do not require ordering or that interact
|
|
+ * with an explicit memory barrier or atomic instruction that provides the
|
|
+ * required ordering.
|
|
+ *
|
|
+ * If possible use READ_ONCE()/WRITE_ONCE() instead.
|
|
*/
|
|
-#define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
|
|
-
|
|
+#define __ACCESS_ONCE(x) ({ \
|
|
+ __maybe_unused typeof(x) __var = (__force typeof(x)) 0; \
|
|
+ (volatile typeof(x) *)&(x); })
|
|
+#define ACCESS_ONCE(x) (*__ACCESS_ONCE(x))
|
|
+
|
|
+/**
|
|
+ * lockless_dereference() - safely load a pointer for later dereference
|
|
+ * @p: The pointer to load
|
|
+ *
|
|
+ * Similar to rcu_dereference(), but for situations where the pointed-to
|
|
+ * object's lifetime is managed by something other than RCU. That
|
|
+ * "something other" might be reference counting or simple immortality.
|
|
+ */
|
|
+#define lockless_dereference(p) \
|
|
+({ \
|
|
+ typeof(p) _________p1 = READ_ONCE(p); \
|
|
+ smp_read_barrier_depends(); /* Dependency order vs. p above. */ \
|
|
+ (_________p1); \
|
|
+})
|
|
+
|
|
+/* Ignore/forbid kprobes attach on very low level functions marked by this attribute: */
|
|
+#ifdef CONFIG_KPROBES
|
|
+# define __kprobes __attribute__((__section__(".kprobes.text")))
|
|
+# define nokprobe_inline __always_inline
|
|
+#else
|
|
+# define __kprobes
|
|
+# define nokprobe_inline inline
|
|
+#endif
|
|
#endif /* __LINUX_COMPILER_H */
|
|
--
|
|
2.7.4
|
|
|