The following commit has been merged into the x86/cleanups branch of tip: Commit-ID: 65412c8d72741cc6e6b082b478b8957d7e7c0480 Gitweb: https://git.kernel.org/tip/65412c8d72741cc6e6b082b478b8957d7e7c0480 Author: Arnd Bergmann <arnd@xxxxxxxx> AuthorDate: Thu, 03 Aug 2023 10:26:15 +02:00 Committer: Borislav Petkov (AMD) <bp@xxxxxxxxx> CommitterDate: Thu, 03 Aug 2023 12:08:35 +02:00 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 <arnd@xxxxxxxx> Signed-off-by: Borislav Petkov (AMD) <bp@xxxxxxxxx> Link: https://lore.kernel.org/r/20230803082619.1369127-4-arnd@xxxxxxxxxx --- arch/x86/include/asm/div64.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/include/asm/div64.h b/arch/x86/include/asm/div64.h index b8f1dc0..9931e4c 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 <asm-generic/div64.h>
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