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s390/irq: simplify do_softirq_own_stack()

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do_softirq_own_stack() is always called from task context and
therefore it is not necessary to check if the async stack is
currently used.
Remove the check and directly switch to async stack.

Reviewed-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2021-07-05 22:26:26 +02:00 committed by Vasily Gorbik
parent 4516f355c5
commit 938e02beb3
1 changed files with 1 additions and 11 deletions
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12
arch/s390/kernel/irq.c
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@ -270,17 +270,7 @@ unsigned int arch_dynirq_lower_bound(unsigned int from)
*/
void do_softirq_own_stack(void)
{
unsigned long old, new;
old = current_stack_pointer();
/* Check against async. stack address range. */
new = S390_lowcore.async_stack;
if (((new - old) >> (PAGE_SHIFT + THREAD_SIZE_ORDER)) != 0) {
CALL_ON_STACK(__do_softirq, new, 0);
} else {
/* We are already on the async stack. */
__do_softirq();
}
CALL_ON_STACK(__do_softirq, S390_lowcore.async_stack, 0);
}
/*