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| author |   Michael Holzheu <holzheu@linux.vnet.ibm.com> | 2010-03-24 11:49:50 +0100 |
|---|---|---|
| committer |   Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2010-03-24 11:49:53 +0100 |
| commit | 92fe31329cb3a2b02f1c7616965872d6a34bcf08 (patch) | |
| tree | 678d046b5864d302e424a2377cf1974b95b1d1f8 /arch/s390/include | |
| parent | Fix up prototype for sys_ipc breakage (diff) | |
| download | linux-dev-92fe31329cb3a2b02f1c7616965872d6a34bcf08.tar.xz linux-dev-92fe31329cb3a2b02f1c7616965872d6a34bcf08.zip | |
[S390] zcore: CPU registers are not saved under LPAR
To save the registers for all CPUs a sigp "store status" is done that
stores the registers to address absolute zero. To access storage at
absolute zero, normally the address of the prefix register of the
accessing CPU has to be used. This does not work when large pages are
active (currently only under LPAR). In order to fix that problem,
instead of memcpy memcpy_real is used, which switches to real mode
where prefixing works.
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include')
| -rw-r--r-- | arch/s390/include/asm/system.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/include/asm/system.h b/arch/s390/include/asm/system.h index 67ee6c3c6bb3..12be42baa055 100644 --- a/arch/s390/include/asm/system.h +++ b/arch/s390/include/asm/system.h @@ -110,6 +110,7 @@ extern void pfault_fini(void); #endif /* CONFIG_PFAULT */ extern void cmma_init(void); +extern int memcpy_real(void *, void *, size_t); #define finish_arch_switch(prev) do { \ set_fs(current->thread.mm_segment); \ |