diff options
| author | Andy Lutomirski <luto@kernel.org> | 2015-10-06 03:47:50 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-10-07 12:34:06 +0300 |
| commit | 7e0f51cb445be8d3aee80e433ed8da4a33ad0157 (patch) | |
| tree | 2f8bca37150f24440dc9753ae3dec3a2c53a283f /arch/x86/include/asm/uaccess.h | |
| parent | a76cf66e948afbaeda8e3ecc861f29c47a026c27 (diff) | |
| download | linux-7e0f51cb445be8d3aee80e433ed8da4a33ad0157.tar.xz | |
x86/uaccess: Add unlikely() to __chk_range_not_ok() failure paths
This should improve code quality a bit. It also shrinks the kernel text:
Before:
text data bss dec filename
21828379 5194760 1277952 28301091 vmlinux
After:
text data bss dec filename
21827997 5194760 1277952 28300709 vmlinux
... by 382 bytes.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/f427b8002d932e5deab9055e0074bb4e7e80ee39.1444091584.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/include/asm/uaccess.h')
| -rw-r--r-- | arch/x86/include/asm/uaccess.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h index 3e911c68876e..09b1b0ab94b7 100644 --- a/arch/x86/include/asm/uaccess.h +++ b/arch/x86/include/asm/uaccess.h @@ -51,13 +51,13 @@ static inline bool __chk_range_not_ok(unsigned long addr, unsigned long size, un * limit, not add it to the address). */ if (__builtin_constant_p(size)) - return addr > limit - size; + return unlikely(addr > limit - size); /* Arbitrary sizes? Be careful about overflow */ addr += size; - if (addr < size) + if (unlikely(addr < size)) return true; - return addr > limit; + return unlikely(addr > limit); } #define __range_not_ok(addr, size, limit) \ |