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sparc64: Need to disable preemption around smp_tsb_sync().

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Based upon a bug report by Mariusz Kozlowski

It uses smp_call_function_masked() now, which has a preemption-disabled
requirement.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2008-08-03 00:01:05 -07:00
parent 8f616cd524
commit a3cf5e6b6f
1 changed files with 4 additions and 1 deletions
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5
arch/sparc64/mm/tsb.c
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@ -1,9 +1,10 @@
/* arch/sparc64/mm/tsb.c
*
* Copyright (C) 2006 David S. Miller <davem@davemloft.net>
* Copyright (C) 2006, 2008 David S. Miller <davem@davemloft.net>
*/
#include <linux/kernel.h>
#include <linux/preempt.h>
#include <asm/system.h>
#include <asm/page.h>
#include <asm/tlbflush.h>
@ -415,7 +416,9 @@ void tsb_grow(struct mm_struct *mm, unsigned long tsb_index, unsigned long rss)
tsb_context_switch(mm);
/* Now force other processors to do the same. */
preempt_disable();
smp_tsb_sync(mm);
preempt_enable();
/* Now it is safe to free the old tsb. */
kmem_cache_free(tsb_caches[old_cache_index], old_tsb);