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| author | Michael Holzheu <holzheu@linux.vnet.ibm.com> | 2013-04-08 16:09:31 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-04-17 14:07:30 +0200 |
| commit | 91c15a951091a64a5f048ff93292057e3b590b6f (patch) | |
| tree | 33e7f36ede3deaa958d14736d83b401b0bc03123 /arch/s390/kernel/entry.h | |
| parent | 5294ee00a16567355c85b849742e5219aad880d0 (diff) | |
| download | linux-91c15a951091a64a5f048ff93292057e3b590b6f.tar.gz linux-91c15a951091a64a5f048ff93292057e3b590b6f.tar.bz2 linux-91c15a951091a64a5f048ff93292057e3b590b6f.zip | |
s390/hibernate: Save and restore absolute zero pages
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>
Diffstat (limited to 'arch/s390/kernel/entry.h')
| -rw-r--r-- | arch/s390/kernel/entry.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/kernel/entry.h b/arch/s390/kernel/entry.h index c3a736a3ed44..aa0ab02e9595 100644 --- a/arch/s390/kernel/entry.h +++ b/arch/s390/kernel/entry.h @@ -7,6 +7,7 @@ #include <asm/cputime.h> extern void *restart_stack; +extern unsigned long suspend_zero_pages; void system_call(void); void pgm_check_handler(void); |