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 <jkeni...@us.ibm.com>
---
arch/powerpc/platforms/pseries/nvram.c | 24 ++++++++++++++++++++++++
1 files changed, 24 insertions(+), 0 deletions(-)
diff --git a/arch/powerpc/platforms/pseries/nvram.c
b/arch/powerpc/platforms/pseries/nvram.c
index 419707b..00cc3a0 100644
--- a/arch/powerpc/platforms/pseries/nvram.c
+++ b/arch/powerpc/platforms/pseries/nvram.c
@@ -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;
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