From: Arnd Bergmann Date: Thu, 3 Aug 2023 08:26:15 +0000 (+0200) Subject: x86/asm: Avoid unneeded __div64_32 function definition X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=65412c8d72741cc6e6b082b478b8957d7e7c0480;p=linux.git x86/asm: Avoid unneeded __div64_32 function definition The __div64_32() function is provided for 32-bit architectures that don't have a custom do_div() implementation. x86_32 has one, and does not use the header file that declares the function prototype, so the definition causes a W=1 warning: lib/math/div64.c:31:32: error: no previous prototype for '__div64_32' [-Werror=missing-prototypes] Define an empty macro to prevent the function definition from getting built, which avoids the warning and saves a little .text space. Signed-off-by: Arnd Bergmann Signed-off-by: Borislav Petkov (AMD) Link: https://lore.kernel.org/r/20230803082619.1369127-4-arnd@kernel.org --- diff --git a/arch/x86/include/asm/div64.h b/arch/x86/include/asm/div64.h index b8f1dc0761e4b..9931e4c7d73f3 100644 --- a/arch/x86/include/asm/div64.h +++ b/arch/x86/include/asm/div64.h @@ -71,6 +71,12 @@ static inline u64 mul_u32_u32(u32 a, u32 b) } #define mul_u32_u32 mul_u32_u32 +/* + * __div64_32() is never called on x86, so prevent the + * generic definition from getting built. + */ +#define __div64_32 + #else # include