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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@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Dave Hansen <dave.hansen@intel.com>
Cc: Bin Yang <bin.yang@intel.com>
Cc: Mark Gross <mark.gross@intel.com>
Link: https://lkml.kernel.org/r/20180919085948.195633798@infradead.org
This commit is contained in:
Peter Zijlstra 2018-09-19 10:50:24 +02:00 committed by Thomas Gleixner
parent 47e262ac5b
commit 7904ba8a66
1 changed files with 1 additions and 1 deletions
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arch/x86/mm/pageattr.c
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@ -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;
}