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arch/*: Disable softirq stacks on PREEMPT_RT.

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PREEMPT_RT preempts softirqs and the current implementation avoids
do_softirq_own_stack() and only uses __do_softirq().

Disable the unused softirqs stacks on PREEMPT_RT to save some memory and
ensure that do_softirq_own_stack() is not used bwcause it is not expected.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Sebastian Andrzej Siewior
2022-06-14 20:18:14 +02:00
committed by Arnd Bergmann
parent b13baccc38
commit f2c5092190
7 changed files with 15 additions and 3 deletions
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3
arch/s390/include/asm/softirq_stack.h
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@@ -5,9 +5,10 @@
#include <asm/lowcore.h>
#include <asm/stacktrace.h>
#ifndef CONFIG_PREEMPT_RT
static inline void do_softirq_own_stack(void)
{
call_on_stack(0, S390_lowcore.async_stack, void, __do_softirq);
}
#endif
#endif /* __ASM_S390_SOFTIRQ_STACK_H */