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>

1 files changed, 5 insertions, 2 deletions

diff --git a/arch/tile/mm/fault.c b/arch/tile/mm/fault.c
index a1da473c8555..22e58f51ed23 100644
--- a/arch/tile/mm/fault.c
+++ b/arch/tile/mm/fault.c
@@ -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;