summary refs log tree commit diff
path: root/arch
diff options
context:
space:
mode:
authorHeiko Carstens <heiko.carstens@de.ibm.com>2015-03-21 12:43:08 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2015-03-25 11:47:07 +0100
commit1833c9f647e9bda1cd24653ff8f9c207b5f5b911 (patch)
tree5fa693217bb108ac1350e7dcd469401fbaf77e46 /arch
parente143fa93c28669a7f0851e6850b1da5b1945fd53 (diff)
downloadlinux-1833c9f647e9bda1cd24653ff8f9c207b5f5b911.tar.gz
s390/smp: reenable smt after resume
After a suspend/resume cycle we missed to enable smt again, which leads
to all sorts of bugs, since the kernel assumes smt is enabled, while the
hardware thinks it is not.

Reported-and-tested-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reported-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/s390/kernel/swsusp_asm64.S11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/s390/kernel/swsusp_asm64.S b/arch/s390/kernel/swsusp_asm64.S
index 6b09fdffbd2f..ca6294645dd3 100644
--- a/arch/s390/kernel/swsusp_asm64.S
+++ b/arch/s390/kernel/swsusp_asm64.S
@@ -177,6 +177,17 @@ restart_entry:
 	lhi	%r1,1
 	sigp	%r1,%r0,SIGP_SET_ARCHITECTURE
 	sam64
+#ifdef CONFIG_SMP
+	larl	%r1,smp_cpu_mt_shift
+	icm	%r1,15,0(%r1)
+	jz	smt_done
+	llgfr	%r1,%r1
+smt_loop:
+	sigp	%r1,%r0,SIGP_SET_MULTI_THREADING
+	brc	8,smt_done			/* accepted */
+	brc	2,smt_loop			/* busy, try again */
+smt_done:
+#endif
 	larl	%r1,.Lnew_pgm_check_psw
 	lpswe	0(%r1)
 pgm_check_entry: