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--- a/arch/x86/include/asm/percpu.h
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+++ b/arch/x86/include/asm/percpu.h
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@@ -76,7 +76,7 @@ extern void __bad_percpu_size(void);
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do { \
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typedef typeof(var) T__; \
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if (0) { \
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- T__ tmp__; \
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+ T__ tmp__ __maybe_unused; \
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tmp__ = (val); \
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} \
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switch (sizeof(var)) { \
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