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: Heiko Carstens <hca@linux.ibm.com>

diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 97961522b317a7b3448e51877badb5c880f49eb0..d4888453bbf8b180714e24ad9c685f26db3f3636 100644 (file)
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -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;