[RFC PATCH 2/3] ARM: entry: Remove unneeded need_resched() loop
From: Valentin Schneider <hidden>
Date: 2019-01-31 18:24:08
Also in:
lkml
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
Since the enabling and disabling of IRQs within preempt_schedule_irq() is contained in a need_resched() loop, we don't need the outer arch code loop. Signed-off-by: Valentin Schneider <redacted> Cc: Russell King <linux@armlinux.org.uk> Cc: Thomas Gleixner <redacted> Cc: Will Deacon <redacted> Cc: Julien Thierry <redacted> Cc: linux-arm-kernel@lists.infradead.org --- arch/arm/kernel/entry-armv.S | 12 +----------- 1 file changed, 1 insertion(+), 11 deletions(-)
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index e85a3af9ddeb..a7ac22e09bb2 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S@@ -220,7 +220,7 @@ __irq_svc: teq r8, #0 @ if preempt count != 0 movne r0, #0 @ force flags to 0 tst r0, #_TIF_NEED_RESCHED - blne svc_preempt + blne preempt_schedule_irq @ irq en/disable is done inside #endif svc_exit r5, irq = 1 @ return from exception
@@ -229,16 +229,6 @@ ENDPROC(__irq_svc) .ltorg -#ifdef CONFIG_PREEMPT -svc_preempt: - mov r8, lr -1: bl preempt_schedule_irq @ irq en/disable is done inside - ldr r0, [tsk, #TI_FLAGS] @ get new tasks TI_FLAGS - tst r0, #_TIF_NEED_RESCHED - reteq r8 @ go again - b 1b -#endif - __und_fault: @ Correct the PC such that it is pointing at the instruction @ which caused the fault. If the faulting instruction was ARM
--
2.20.1
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel