Commit-ID: 8b80fd8b45458a7d0b726d454c51c5219e0fb2ee
Gitweb: http://git.kernel.org/tip/8b80fd8b45458a7d0b726d454c51c5219e0fb2ee
Author: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
AuthorDate: Wed, 26 Feb 2014 12:06:50 -0700
Committer: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
CommitDate: Thu, 27 Feb 2014 08:26:10 -0800
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@xxxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1393441612-19729-3-git-send-email-ross.zwisler@xxxxxxxxxxxxxxx
Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
---
arch/x86/mm/pageattr.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index b3b19f4..b1c4672 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();
}
--
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