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Commit 8b80fd8b authored by Ross Zwisler's avatar Ross Zwisler Committed by H. Peter Anvin
Browse files

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: default avatarRoss 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: default avatarH. Peter Anvin <hpa@linux.intel.com>
parent 171699f7

arch/x86/mm/pageattr.c

+4 −4
Original line number Diff line number Diff line
@@ -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();

}