From: Arnd Bergmann <arnd@xxxxxxxx> 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> --- arch/x86/include/asm/div64.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/include/asm/div64.h b/arch/x86/include/asm/div64.h index b8f1dc0761e4..9826d5fc12e3 100644 --- a/arch/x86/include/asm/div64.h +++ b/arch/x86/include/asm/div64.h @@ -71,6 +71,8 @@ static inline u64 mul_u32_u32(u32 a, u32 b) } #define mul_u32_u32 mul_u32_u32 +#define __div64_32 /* not needed */ + #else # include <asm-generic/div64.h> -- 2.39.2
