[PATCH] nios2: Use preempt_schedule_irq

From: Tobias Klauser
Date: Tue Dec 30 2014 - 09:02:43 EST

Follow aa0d53260596 ("ia64: Use preempt_schedule_irq") and use
preempt_schedule_irq instead of enabling/disabling interrupts and messing around
with PREEMPT_ACTIVE in the nios2 low-level preemption code ourselves. Also get
rid of the now needless re-check for TIF_NEED_RESCHED, preempt_schedule_irq
will already take care of rescheduling.

This also fixes the following build error when building with CONFIG_PREEMPT:

arch/nios2/kernel/built-in.o: In function `need_resched':
arch/nios2/kernel/entry.S:374: undefined reference to `PREEMPT_ACTIVE'

Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Tobias Klauser <tklauser@xxxxxxxxxx>
arch/nios2/kernel/entry.S | 20 ++------------------
1 file changed, 2 insertions(+), 18 deletions(-)

diff --git a/arch/nios2/kernel/entry.S b/arch/nios2/kernel/entry.S
index 83bca17..0bdfd13 100644
--- a/arch/nios2/kernel/entry.S
+++ b/arch/nios2/kernel/entry.S
@@ -365,30 +365,14 @@ ENTRY(ret_from_interrupt)
ldw r4, TI_PREEMPT_COUNT(r1)
bne r4, r0, restore_all
ldw r4, TI_FLAGS(r1) /* ? Need resched set */
BTBZ r10, r4, TIF_NEED_RESCHED, restore_all
ldw r4, PT_ESTATUS(sp) /* ? Interrupts off */
andi r10, r4, ESTATUS_EPIE
beq r10, r0, restore_all
- movia r4, PREEMPT_ACTIVE
- stw r4, TI_PREEMPT_COUNT(r1)
- rdctl r10, status /* enable intrs again */
- ori r10, r10 ,STATUS_PIE
- wrctl status, r10
- PUSH r1
- call schedule
- POP r1
- mov r4, r0
- stw r4, TI_PREEMPT_COUNT(r1)
- rdctl r10, status /* disable intrs */
- andi r10, r10, %lo(~STATUS_PIE)
- wrctl status, r10
- br need_resched
- br restore_all
+ call preempt_schedule_irq
+ br restore_all

* A few syscall wrappers

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