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quicklist: Set tlb->need_flush if pages are remaining in quicklist 0

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This ensures that the quicklists are drained. Otherwise draining may only
occur when the processor reaches an idle state.

Fixes fatal leakage of pgd_t's on 2.6.22 and later.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Reported-by: Dhaval Giani <dhaval@linux.vnet.ibm.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Lameter 2007-12-17 16:20:27 -08:00 committed by Linus Torvalds
parent 3811dbf671
commit 421d991935
1 changed files with 4 additions and 0 deletions
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4
include/asm-generic/tlb.h
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@ -14,6 +14,7 @@
#define _ASM_GENERIC__TLB_H
#include <linux/swap.h>
#include <linux/quicklist.h>
#include <asm/pgalloc.h>
#include <asm/tlbflush.h>
@ -85,6 +86,9 @@ tlb_flush_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
static inline void
tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
{
#ifdef CONFIG_QUICKLIST
tlb->need_flush += &__get_cpu_var(quicklist)[0].nr_pages != 0;
#endif
tlb_flush_mmu(tlb, start, end);
/* keep the page table cache within bounds */