Commit-ID: 7904ba8a66f400182a204893c92098994e22a88d
Gitweb: https://git.kernel.org/tip/7904ba8a66f400182a204893c92098994e22a88d
Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
AuthorDate: Wed, 19 Sep 2018 10:50:24 +0200
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Thu, 27 Sep 2018 20:39:42 +0200
x86/mm/cpa: Optimize __cpa_flush_range()
If we IPI for WBINDV, then we might as well kill the entire TLB too.
But if we don't have to invalidate cache, there is no reason not to
use a range TLB flush.
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Reviewed-by: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: Bin Yang <bin.yang@xxxxxxxxx>
Cc: Mark Gross <mark.gross@xxxxxxxxx>
Link: https://lkml.kernel.org/r/20180919085948.195633798@xxxxxxxxxxxxx
---
arch/x86/mm/pageattr.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index dc552824e86a..62bb30b4bd2a 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -291,7 +291,7 @@ static bool __cpa_flush_range(unsigned long start, int numpages, int cache)
WARN_ON(PAGE_ALIGN(start) != start);
- if (!static_cpu_has(X86_FEATURE_CLFLUSH)) {
+ if (cache && !static_cpu_has(X86_FEATURE_CLFLUSH)) {
cpa_flush_all(cache);
return true;
}
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