tile: ensure interrupts disabled for preempt_schedule_irq()

When coming from a page fault (for example), interrupts might
be enabled as we enter the code to return from interrupt.

Cc: stable@vger.kernel.org
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

diff --git a/arch/tile/kernel/intvec_32.S b/arch/tile/kernel/intvec_32.S
index 088d5c1..2cbe6d5 100644 (file)
--- a/arch/tile/kernel/intvec_32.S
+++ b/arch/tile/kernel/intvec_32.S
@@ -815,6 +815,9 @@ STD_ENTRY(interrupt_return)
        }
        bzt     r28, 1f
        bnz     r29, 1f
+       /* Disable interrupts explicitly for preemption. */
+       IRQ_DISABLE(r20,r21)
+       TRACE_IRQS_OFF
        jal     preempt_schedule_irq
        FEEDBACK_REENTER(interrupt_return)
 1:

diff --git a/arch/tile/kernel/intvec_64.S b/arch/tile/kernel/intvec_64.S
index ec755d3..b8fc497 100644 (file)
--- a/arch/tile/kernel/intvec_64.S
+++ b/arch/tile/kernel/intvec_64.S
@@ -841,6 +841,9 @@ STD_ENTRY(interrupt_return)
        }
        beqzt   r28, 1f
        bnez    r29, 1f
+       /* Disable interrupts explicitly for preemption. */
+       IRQ_DISABLE(r20,r21)
+       TRACE_IRQS_OFF
        jal     preempt_schedule_irq
        FEEDBACK_REENTER(interrupt_return)
 1: