From 8b80fd8b45458a7d0b726d454c51c5219e0fb2ee Mon Sep 17 00:00:00 2001
From: Ross Zwisler <ross.zwisler@linux.intel.com>
Date: Wed, 26 Feb 2014 12:06:50 -0700
Subject: [PATCH] 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>
---
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 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();
}
--
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