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powerpc/nvram: Don't overwrite oops/panic report on normal shutdown 

For normal halt, reboot, and poweroff events, refrain from overwriting
the lnx,oops-log partition.  Also, don't save the dmesg buffer on an
emergency-restart event if we've already saved it earlier in panic().

Signed-off-by: Jim Keniston <jkenisto@us.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Jim Keniston 2011-03-25 12:47:58 +00:00 committed by Benjamin Herrenschmidt
parent ff56535d29
commit 15d260b36f
1 changed files with 24 additions and 0 deletions
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24
arch/powerpc/platforms/pseries/nvram.c
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@ -480,8 +480,32 @@ static void oops_to_nvram(struct kmsg_dumper *dumper,
const char *new_msgs, unsigned long new_len)
{
static unsigned int oops_count = 0;
static bool panicking = false;
size_t text_len;
switch (reason) {
case KMSG_DUMP_RESTART:
case KMSG_DUMP_HALT:
case KMSG_DUMP_POWEROFF:
/* These are almost always orderly shutdowns. */
return;
case KMSG_DUMP_OOPS:
case KMSG_DUMP_KEXEC:
break;
case KMSG_DUMP_PANIC:
panicking = true;
break;
case KMSG_DUMP_EMERG:
if (panicking)
/* Panic report already captured. */
return;
break;
default:
pr_err("%s: ignoring unrecognized KMSG_DUMP_* reason %d\n",
__FUNCTION__, (int) reason);
return;
}
if (clobbering_unread_rtas_event())
return;