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[SPARC64]: Disable preemption during flush_tlb_pending().

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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>
This commit is contained in:
David S. Miller 2006-04-30 22:54:27 -07:00
parent 1241140f51
commit c9f2946fbe
1 changed files with 5 additions and 0 deletions
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5
arch/sparc64/mm/tlb.c
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@ -8,6 +8,7 @@
#include <linux/percpu.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/preempt.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
@ -24,6 +25,8 @@ void flush_tlb_pending(void)
{
struct mmu_gather *mp = &__get_cpu_var(mmu_gathers);
preempt_disable();
if (mp->tlb_nr) {
flush_tsb_user(mp);
@ -38,6 +41,8 @@ void flush_tlb_pending(void)
}
mp->tlb_nr = 0;
}
preempt_enable();
}
void tlb_batch_add(struct mm_struct *mm, unsigned long vaddr, pte_t *ptep, pte_t orig)