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arch/tile: don't enable irqs unconditionally in page fault handler 

If we took a page fault while we had interrupts disabled, we
shouldn't enable them in the page fault handler.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
This commit is contained in:
Chris Metcalf 2012-03-29 15:40:50 -04:00
parent 12400f1f22
commit b230ff2d5c
1 changed files with 5 additions and 2 deletions
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7
arch/tile/mm/fault.c
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@ -342,9 +342,12 @@ static int handle_page_fault(struct pt_regs *regs,
/*
* If we're trying to touch user-space addresses, we must
* be either at PL0, or else with interrupts enabled in the
* kernel, so either way we can re-enable interrupts here.
* kernel, so either way we can re-enable interrupts here
* unless we are doing atomic access to user space with
* interrupts disabled.
*/
local_irq_enable();
if (!(regs->flags & PT_FLAGS_DISABLE_IRQ))
local_irq_enable();
mm = tsk->mm;