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authorDavid S. Miller <davem@sunset.davemloft.net>2006-05-01 01:54:27 -0400
committerDavid S. Miller <davem@sunset.davemloft.net>2006-05-01 01:54:27 -0400
commitc9f2946fbec88d4baa3a6d47eb3a8e6b08b05cd9 (patch)
tree2b18303a2a69cf0c9d0224daebda5e5fc34308d8 /arch/sparc64
parent1241140f5183db38393556832198a3b109bf9085 (diff)
[SPARC64]: Disable preemption during flush_tlb_pending().
A context switch will force a call to flush_tlb_pending() (via switch_to()), so if we test tlb_nr to be non-zero, then sleep, it would become zero and later back at the original context we'll pass zero down into the TLB flushing code which should never see a nr argument of zero. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc64')
-rw-r--r--arch/sparc64/mm/tlb.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/sparc64/mm/tlb.c b/arch/sparc64/mm/tlb.c
index a079cf42505e..3f10fc921b00 100644
--- a/arch/sparc64/mm/tlb.c
+++ b/arch/sparc64/mm/tlb.c
@@ -8,6 +8,7 @@
8#include <linux/percpu.h> 8#include <linux/percpu.h>
9#include <linux/mm.h> 9#include <linux/mm.h>
10#include <linux/swap.h> 10#include <linux/swap.h>
11#include <linux/preempt.h>
11 12
12#include <asm/pgtable.h> 13#include <asm/pgtable.h>
13#include <asm/pgalloc.h> 14#include <asm/pgalloc.h>
@@ -24,6 +25,8 @@ void flush_tlb_pending(void)
24{ 25{
25 struct mmu_gather *mp = &__get_cpu_var(mmu_gathers); 26 struct mmu_gather *mp = &__get_cpu_var(mmu_gathers);
26 27
28 preempt_disable();
29
27 if (mp->tlb_nr) { 30 if (mp->tlb_nr) {
28 flush_tsb_user(mp); 31 flush_tsb_user(mp);
29 32
@@ -38,6 +41,8 @@ void flush_tlb_pending(void)
38 } 41 }
39 mp->tlb_nr = 0; 42 mp->tlb_nr = 0;
40 } 43 }
44
45 preempt_enable();
41} 46}
42 47
43void tlb_batch_add(struct mm_struct *mm, unsigned long vaddr, pte_t *ptep, pte_t orig) 48void tlb_batch_add(struct mm_struct *mm, unsigned long vaddr, pte_t *ptep, pte_t orig)