Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=cd8ddf1a2800026dd58433333cce7a65cbc6c6d2
Commit: cd8ddf1a2800026dd58433333cce7a65cbc6c6d2
Parent: af1e6844d60057774910a2d08bd75b67d73ba7d5
Author: Thomas Gleixner <[EMAIL PROTECTED]>
AuthorDate: Wed Jan 30 13:34:08 2008 +0100
Committer: Ingo Molnar <[EMAIL PROTECTED]>
CommitDate: Wed Jan 30 13:34:08 2008 +0100
x86: clflush_page_range needs mfence
clflush is an unordered operation with respect to other memory
traffic, including other CLFLUSH instructions. This needs proper
fencing with mfence.
Signed-off-by: Thomas Gleixner <[EMAIL PROTECTED]>
Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
---
arch/x86/mm/pageattr.c | 12 ++++++++++++
1 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index cdd2ea2..90b658a 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -25,12 +25,24 @@ within(unsigned long addr, unsigned long start, unsigned
long end)
/*
* Flushing functions
*/
+
+
+/**
+ * clflush_cache_range - flush a cache range with clflush
+ * @addr: virtual start address
+ * @size: number of bytes to flush
+ *
+ * clflush is an unordered instruction which needs fencing with mfence
+ * to avoid ordering issues.
+ */
void clflush_cache_range(void *addr, int size)
{
int i;
+ mb();
for (i = 0; i < size; i += boot_cpu_data.x86_clflush_size)
clflush(addr+i);
+ mb();
}
static void __cpa_flush_all(void *arg)
-
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