s390/hibernate: Save and restore absolute zero pages

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Since commit 5f954c34 ([S390] hibernation: fix lowcore handling)
the absolute zero lowcore is lost during suspend/resume.
For example, this leads to the problem that the re-IPL device
for kdump is no longer set after resume.

With this patch during suspend a buffer is allocated in the new PM
notifier "suspend_pm_cb" and then the absolute zero lowcore is saved
to that buffer. The resume code then copies back this buffer to
absolute zero and afterwards the PM notifier releases the memory.

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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This commit is contained in:

Michael Holzheu 2013-04-08 16:09:31 +02:00 • committed by Martin Schwidefsky

parent 5294ee00a1

commit 91c15a9510

3 changed files with 58 additions and 3 deletions

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1

arch/s390/kernel/entry.h

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31

arch/s390/kernel/suspend.c

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29

arch/s390/kernel/swsusp_asm64.S

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