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sched/rt, ARM: Use CONFIG_PREEMPTION

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CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by CONFIG_PREEMPT_RT.
Both PREEMPT and PREEMPT_RT require the same functionality which today
depends on CONFIG_PREEMPT.

Switch the entry code, cache over to use CONFIG_PREEMPTION and add output
in show_stack() for PREEMPT_RT.

[bigeasy: +traps.c]

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20191015191821.11479-2-bigeasy@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Thomas Gleixner
2019-10-15 21:17:48 +02:00
committed by Ingo Molnar
parent 4f797f56c3
commit e7289c6de8
5 changed files with 9 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
arch/arm/kernel/entry-armv.S
View File

@@ -211,7 +211,7 @@ __irq_svc:
svc_entry
irq_handler
#ifdef CONFIG_PREEMPT
#ifdef CONFIG_PREEMPTION
ldr r8, [tsk, #TI_PREEMPT] @ get preempt count
ldr r0, [tsk, #TI_FLAGS] @ get flags
teq r8, #0 @ if preempt count != 0
@@ -226,7 +226,7 @@ ENDPROC(__irq_svc)
.ltorg
#ifdef CONFIG_PREEMPT
#ifdef CONFIG_PREEMPTION
svc_preempt:
mov r8, lr
1: bl preempt_schedule_irq @ irq en/disable is done inside

2
arch/arm/kernel/traps.c
View File

@@ -248,6 +248,8 @@ void show_stack(struct task_struct *tsk, unsigned long *sp)
#ifdef CONFIG_PREEMPT
#define S_PREEMPT " PREEMPT"
#elif defined(CONFIG_PREEMPT_RT)
#define S_PREEMPT " PREEMPT_RT"
#else
#define S_PREEMPT ""
#endif