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Commit 421d9919 authored by Christoph Lameter's avatar Christoph Lameter Committed by Linus Torvalds
Browse files

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



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: default avatarChristoph Lameter <clameter@sgi.com>
Reported-by: default avatarDhaval Giani <dhaval@linux.vnet.ibm.com>
Cc: <stable@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 3811dbf6

include/asm-generic/tlb.h

+4 −0
Original line number Diff line number Diff line
@@ -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 */