github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-23 22:52:19 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

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

Browse Source 
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>
This commit is contained in:
Heiko Carstens 2023-02-27 18:56:10 +01:00
parent e7ec1d2eac
commit e688c6255b
1 changed files with 1 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/s390/kernel/smp.c
View File

@ -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;