[PATCH 05/20] mm, powerpc: Dont use tlb_flush for external tlb flushes

[Peter Zijlstra <a.p.zijlstra@chello.nl>]

[-- Attachment #1: powerpc64-tlb_flush.patch --]
[-- Type: text/plain, Size: 1314 bytes --]

Both sparc64 and powerpc64 use tlb_flush() to flush their respective
hash-tables which is entirely different from what
flush_tlb_range()/flush_tlb_mm() would do.

Powerpc64 already uses arch_*_lazy_mmu_mode() to batch and flush these
so any tlb_flush() caller should already find an empty batch. So
remove this functionality from tlb_flush().

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
 arch/powerpc/mm/tlb_hash64.c |   10 ----------
 1 file changed, 10 deletions(-)
--- a/arch/powerpc/mm/tlb_hash64.c
+++ b/arch/powerpc/mm/tlb_hash64.c
@@ -155,16 +155,6 @@ void __flush_tlb_pending(struct ppc64_tl
 
 void tlb_flush(struct mmu_gather *tlb)
 {
-	struct ppc64_tlb_batch *tlbbatch = &get_cpu_var(ppc64_tlb_batch);
-
-	/* If there's a TLB batch pending, then we must flush it because the
-	 * pages are going to be freed and we really don't want to have a CPU
-	 * access a freed page because it has a stale TLB
-	 */
-	if (tlbbatch->index)
-		__flush_tlb_pending(tlbbatch);
-
-	put_cpu_var(ppc64_tlb_batch);
 }
 
 /**


--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>