If clflushopt is available on the system, use it instead of clflush in
clflush_cache_range.
Signed-off-by: Ross Zwisler <ross.zwis...@linux.intel.com>
Cc: H Peter Anvin <h.peter.an...@intel.com>
Cc: Ingo Molnar <mi...@kernel.org>
Cc: Thomas Gleixner <t...@linutronix.de>
---
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 bb32480..11d500a 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -125,8 +125,8 @@ 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)
{
@@ -135,11 +135,11 @@ 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();
}
--
1.7.10.4
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