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| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-01-19 06:56:57 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-01-19 06:56:57 +0800 |
| commit | 3542f6b1836d8940615104e22248bb9b7cf54f5f (patch) | |
| tree | 6808fae6dfb12bb4b7e5e0df4efbe3e0dae8c537 /arch/x86/include/asm/vgtod.h | |
| parent | d885d4f3728f386034bb2f7a61b7f2054c49b2d4 (diff) | |
| parent | ec6f34e5b552fb0a52e6aae1a5afbbb1605cc6cc (diff) | |
| download | linux-3542f6b1836d8940615104e22248bb9b7cf54f5f.tar.gz linux-3542f6b1836d8940615104e22248bb9b7cf54f5f.tar.bz2 linux-3542f6b1836d8940615104e22248bb9b7cf54f5f.zip | |
Merge 3.19-rc5 into char-misc-next
We want the 3.19-rc5 fixes in here for our testing.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/x86/include/asm/vgtod.h')
| -rw-r--r-- | arch/x86/include/asm/vgtod.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/x86/include/asm/vgtod.h b/arch/x86/include/asm/vgtod.h index e7e9682a33e9..f556c4843aa1 100644 --- a/arch/x86/include/asm/vgtod.h +++ b/arch/x86/include/asm/vgtod.h @@ -80,9 +80,11 @@ static inline unsigned int __getcpu(void) /* * Load per CPU data from GDT. LSL is faster than RDTSCP and - * works on all CPUs. + * works on all CPUs. This is volatile so that it orders + * correctly wrt barrier() and to keep gcc from cleverly + * hoisting it out of the calling function. */ - asm("lsl %1,%0" : "=r" (p) : "r" (__PER_CPU_SEG)); + asm volatile ("lsl %1,%0" : "=r" (p) : "r" (__PER_CPU_SEG)); return p; } |