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s390/smp: only send external call ipi if needed

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If the per cpu ec_mask bit of the receiving cpu is already set there is
no need to send an ipi, since a different cpu has already sent an ipi
and the receiving cpu has not yet executed the external call ipi handler.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2013-12-03 10:06:29 +01:00 committed by Martin Schwidefsky
parent e6b2551425
commit dea24190fb
1 changed files with 3 additions and 3 deletions
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6
arch/s390/kernel/smp.c
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@ -159,9 +159,9 @@ static void pcpu_ec_call(struct pcpu *pcpu, int ec_bit)
{
int order;
set_bit(ec_bit, &pcpu->ec_mask);
order = pcpu_running(pcpu) ?
SIGP_EXTERNAL_CALL : SIGP_EMERGENCY_SIGNAL;
if (test_and_set_bit(ec_bit, &pcpu->ec_mask))
return;
order = pcpu_running(pcpu) ? SIGP_EXTERNAL_CALL : SIGP_EMERGENCY_SIGNAL;
pcpu_sigp_retry(pcpu, order, 0);
}