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| author | Michael Holzheu <holzheu@linux.vnet.ibm.com> | 2015-05-26 19:05:23 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2015-06-25 09:39:26 +0200 |
| commit | 1592a8e456436024b6c662f423ce672e672169bb (patch) | |
| tree | 2afa9f14819db46b7e11e918e5f69124dc31f71c /drivers/s390/char/zcore.c | |
| parent | 1d1858d2444770154d311e8df5849d44f957dba3 (diff) | |
| download | linux-stable-1592a8e456436024b6c662f423ce672e672169bb.tar.gz linux-stable-1592a8e456436024b6c662f423ce672e672169bb.tar.bz2 linux-stable-1592a8e456436024b6c662f423ce672e672169bb.zip | |
s390/kdump: fix nosmt kernel parameter
It turned out that SIGP set-multi-threading can only be done once.
Therefore switching to a different MT level after switching to
sclp.mtid_prev in the dump case fails.
As a symptom specifying the "nosmt" parameter currently fails for
the kdump kernel and the kernel starts with multi-threading enabled.
So fix this and issue diag 308 subcode 1 call after collecting the
CPU states for the dump. Also enhance the diag308_reset() function to
be usable also with enabled lowcore protection and prefix register != 0.
After the reset it is possible to switch the MT level again. We have
to do the reset very early in order not to kill the already initialized
console. Therefore instead of kmalloc() the corresponding memblock
functions have to be used. To avoid copying the sclp cpu code into
sclp_early, we now use the simple sigp loop method for CPU detection.
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/char/zcore.c')
| -rw-r--r-- | drivers/s390/char/zcore.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/s390/char/zcore.c b/drivers/s390/char/zcore.c index 9a3dd95029cc..823f41fc4bbd 100644 --- a/drivers/s390/char/zcore.c +++ b/drivers/s390/char/zcore.c @@ -154,7 +154,7 @@ static int __init init_cpu_info(enum arch_id arch) /* get info for boot cpu from lowcore, stored in the HSA */ - sa_ext = dump_save_area_create(0); + sa_ext = dump_save_areas.areas[0]; if (!sa_ext) return -ENOMEM; if (memcpy_hsa_kernel(&sa_ext->sa, sys_info.sa_base, |