From: Andrey Ryabinin Date: Fri, 16 Oct 2015 11:28:53 +0000 (+0300) Subject: x86, kasan: Fix build failure on KASAN=y && KMEMCHECK=y kernels X-Git-Tag: v5.15~14893^2~2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a75ca545e8d57473da47ece828ad98a10727ec6f;p=platform%2Fkernel%2Flinux-starfive.git x86, kasan: Fix build failure on KASAN=y && KMEMCHECK=y kernels Declaration of memcpy() is hidden under #ifndef CONFIG_KMEMCHECK. In asm/efi.h under #ifdef CONFIG_KASAN we #undef memcpy(), due to which the following happens: In file included from arch/x86/kernel/setup.c:96:0: ./arch/x86/include/asm/desc.h: In function ‘native_write_idt_entry’: ./arch/x86/include/asm/desc.h:122:2: error: implicit declaration of function ‘memcpy’ [-Werror=implicit-function-declaration] memcpy(&idt[entry], gate, sizeof(*gate)); ^ cc1: some warnings being treated as errors make[2]: *** [arch/x86/kernel/setup.o] Error 1 We will get rid of that #undef in asm/efi.h eventually. But in the meanwhile move memcpy() declaration out of #ifdefs to fix the build. Reported-by: Borislav Petkov Signed-off-by: Andrey Ryabinin Cc: Andy Lutomirski Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/1444994933-28328-1-git-send-email-aryabinin@virtuozzo.com Signed-off-by: Ingo Molnar --- diff --git a/arch/x86/include/asm/string_64.h b/arch/x86/include/asm/string_64.h index e466119..ff8b9a1 100644 --- a/arch/x86/include/asm/string_64.h +++ b/arch/x86/include/asm/string_64.h @@ -27,12 +27,11 @@ static __always_inline void *__inline_memcpy(void *to, const void *from, size_t function. */ #define __HAVE_ARCH_MEMCPY 1 +extern void *memcpy(void *to, const void *from, size_t len); extern void *__memcpy(void *to, const void *from, size_t len); #ifndef CONFIG_KMEMCHECK -#if (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) || __GNUC__ > 4 -extern void *memcpy(void *to, const void *from, size_t len); -#else +#if (__GNUC__ == 4 && __GNUC_MINOR__ < 3) || __GNUC__ < 4 #define memcpy(dst, src, len) \ ({ \ size_t __len = (len); \