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x86/asm: Clobber flags in clear_page() 

All clear_page() implementations use XOR which resets flags.

Judging by allyesconfig disassembly no code is affected.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Reviewed-by: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20180113185048.GA23111@avx2
Signed-off-by: Ingo Molnar <mingo@kernel.org>
hifive-unleashed-5.1
Alexey Dobriyan 2018-01-13 21:50:48 +03:00 committed by Ingo Molnar
parent 178e834c47
commit 1acdbf7ea8
1 changed files with 1 additions and 1 deletions
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2
arch/x86/include/asm/page_64.h
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@ -47,7 +47,7 @@ static inline void clear_page(void *page)
clear_page_erms, X86_FEATURE_ERMS,
"=D" (page),
"0" (page)
: "memory", "rax", "rcx");
: "cc", "memory", "rax", "rcx");
}
void copy_page(void *to, void *from);