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x86/asm: Avoid unneeded __div64_32 function definition

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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@arndb.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230803082619.1369127-4-arnd@kernel.org
This commit is contained in:
Arnd Bergmann 2023-08-03 10:26:15 +02:00 committed by Borislav Petkov (AMD)
parent 22dc02f81c
commit 65412c8d72
1 changed files with 6 additions and 0 deletions
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6
arch/x86/include/asm/div64.h
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@ -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>