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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
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@ -291,7 +291,7 @@ static bool __cpa_flush_range(unsigned long start, int numpages, int cache)
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WARN_ON(PAGE_ALIGN(start) != start);
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if (!static_cpu_has(X86_FEATURE_CLFLUSH)) {
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if (cache && !static_cpu_has(X86_FEATURE_CLFLUSH)) {
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cpa_flush_all(cache);
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return true;
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}
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