Commit 65412c8d authored by Arnd Bergmann's avatar Arnd Bergmann Committed by Borislav Petkov (AMD)
Browse files

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: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarBorislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230803082619.1369127-4-arnd@kernel.org
parent 22dc02f8

arch/x86/include/asm/div64.h

+6 −0
Original line number Diff line number Diff line
@@ -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>