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authorVineet Gupta <Vineet.Gupta1@synopsys.com>2013-07-03 15:03:31 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-08-04 16:50:32 +0800
commit78077c226f0ab20fcd0a85a8f0de42b96973382b (patch)
treec134d799e44559f94c10865ffaa019a9345e2307 /mm
parent6f7bb6bafb3153e9b9383f3f44a0f23fc00318d9 (diff)
downloadvexpress-lsk-78077c226f0ab20fcd0a85a8f0de42b96973382b.tar.gz
mm: fix the TLB range flushed when __tlb_remove_page() runs out of slots
commit e6c495a96ce02574e765d5140039a64c8d4e8c9e upstream. zap_pte_range loops from @addr to @end. In the middle, if it runs out of batching slots, TLB entries needs to be flushed for @start to @interim, NOT @interim to @end. Since ARC port doesn't use page free batching I can't test it myself but this seems like the right thing to do. Observed this when working on a fix for the issue at thread: http://www.spinics.net/lists/linux-arch/msg21736.html Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Hugh Dickins <hughd@google.com> Cc: Rik van Riel <riel@redhat.com> Cc: David Rientjes <rientjes@google.com> Cc: Peter Zijlstra <peterz@infradead.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memory.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 61a262b08e5..5e5080005bc 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1101,6 +1101,7 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb,
spinlock_t *ptl;
pte_t *start_pte;
pte_t *pte;
+ unsigned long range_start = addr;
again:
init_rss_vec(rss);
@@ -1206,12 +1207,14 @@ again:
force_flush = 0;
#ifdef HAVE_GENERIC_MMU_GATHER
- tlb->start = addr;
- tlb->end = end;
+ tlb->start = range_start;
+ tlb->end = addr;
#endif
tlb_flush_mmu(tlb);
- if (addr != end)
+ if (addr != end) {
+ range_start = addr;
goto again;
+ }
}
return addr;