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| author | Ross Zwisler <ross.zwisler@linux.intel.com> | 2014-02-26 12:06:50 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2014-02-27 08:26:10 -0800 |
| commit | 8b80fd8b45458a7d0b726d454c51c5219e0fb2ee (patch) | |
| tree | cdff4e4cb0156bb0304be33ec1c4513f22687ccf /arch/x86/mm/pageattr.c | |
| parent | 171699f7630c92d0a928f83e5fb3aeabe35398c0 (diff) | |
| download | lwn-8b80fd8b45458a7d0b726d454c51c5219e0fb2ee.tar.gz lwn-8b80fd8b45458a7d0b726d454c51c5219e0fb2ee.zip | |
x86: Use clflushopt in clflush_cache_range
If clflushopt is available on the system, use it instead of clflush in
clflush_cache_range.
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Link: http://lkml.kernel.org/r/1393441612-19729-3-git-send-email-ross.zwisler@linux.intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/mm/pageattr.c')
| -rw-r--r-- | arch/x86/mm/pageattr.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index b3b19f46c016..b1c46723b19b 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -126,8 +126,8 @@ within(unsigned long addr, unsigned long start, unsigned long end) * @vaddr: virtual start address * @size: number of bytes to flush * - * clflush is an unordered instruction which needs fencing with mfence - * to avoid ordering issues. + * clflushopt is an unordered instruction which needs fencing with mfence or + * sfence to avoid ordering issues. */ void clflush_cache_range(void *vaddr, unsigned int size) { @@ -136,11 +136,11 @@ void clflush_cache_range(void *vaddr, unsigned int size) mb(); for (; vaddr < vend; vaddr += boot_cpu_data.x86_clflush_size) - clflush(vaddr); + clflushopt(vaddr); /* * Flush any possible final partial cacheline: */ - clflush(vend); + clflushopt(vend); mb(); } |