ARM: entry: avoid enabling interrupts in prefetch/data abort handlers

Avoid enabling interrupts if the parent context had interrupts enabled
in the abort handler assembly code, and move this into the breakpoint/
page/alignment fault handlers instead.

This gets rid of some special-casing for the breakpoint fault handlers
from the low level abort handler path.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
index bc0e1d88fd3b..20e5d5120609 100644
--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -285,6 +285,10 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
         tsk = current;
         mm  = tsk->mm;
 
+        /* Enable interrupts if they were enabled in the parent context. */
+        if (interrupts_enabled(regs))
+                local_irq_enable();
+
         /*
          * If we're in an interrupt or have no user
          * context, we must not take the fault..