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Commit dea24190 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
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s390/smp: only send external call ipi if needed 



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: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent e6b25514

arch/s390/kernel/smp.c

+3 −3
Original line number Diff line number Diff line
@@ -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);

}