Commit e688c625 authored by Heiko Carstens's avatar Heiko Carstens
Browse files

s390/smp: perform cpu reset before delegating work to target cpu 



Clear CPU state (e.g. all TLB entries, prefetched instructions, etc.)
of the target CPU, however without clearing register contents before
starting any work on it.

This puts the target CPU in a more defined state compared to the
current Stop + Restart sigp orders.

Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
parent e7ec1d2e

arch/s390/kernel/smp.c

+1 −0
Original line number Diff line number Diff line
@@ -333,6 +333,7 @@ static void pcpu_delegate(struct pcpu *pcpu, 
	}

	/* Stop target cpu (if func returns this stops the current cpu). */

	pcpu_sigp_retry(pcpu, SIGP_STOP, 0);

	pcpu_sigp_retry(pcpu, SIGP_CPU_RESET, 0);

	/* Restart func on the target cpu and stop the current cpu. */

	if (lc) {

		lc->restart_stack = stack;