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s390/suspend: fix stack setup in swsusp_arch_suspend 

The patch that added support for the virtually mapped kernel stacks changed
swsusp_arch_suspend to switch to the nodat-stack as the vmap stack is not
available while going in and out of suspend.

Unfortunately the switch to the nodat-stack is incorrect which breaks
suspend to disk.

Cc: stable@vger.kernel.org # v4.20
Fixes: ce3dc44749 ("s390: add support for virtually mapped kernel stacks")
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2019-01-17 11:20:28 +01:00
parent f17b5f06cb
commit 634692ab70
1 changed files with 2 additions and 2 deletions
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4
arch/s390/kernel/swsusp.S
View File

@ -30,10 +30,10 @@
.section .text
ENTRY(swsusp_arch_suspend)
lg %r1,__LC_NODAT_STACK
aghi %r1,-STACK_FRAME_OVERHEAD
stmg %r6,%r15,__SF_GPRS(%r1)
aghi %r1,-STACK_FRAME_OVERHEAD
stg %r15,__SF_BACKCHAIN(%r1)
lgr %r1,%r15
lgr %r15,%r1
/* Store FPU registers */
brasl %r14,save_fpu_regs