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Message-Id: <20230725134837.1534228-3-arnd@kernel.org>
Date: Tue, 25 Jul 2023 15:48:34 +0200
From: Arnd Bergmann <arnd@...nel.org>
To: linux-kernel@...r.kernel.org, x86@...nel.org
Cc: Arnd Bergmann <arnd@...db.de>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>,
"H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH 2/5] [RESEND] x86: avoid unneeded __div64_32 function definition
From: Arnd Bergmann <arnd@...db.de>
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@...db.de>
---
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 b8f1dc0761e4b..9826d5fc12e34 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
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