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>
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@ -480,8 +480,32 @@ static void oops_to_nvram(struct kmsg_dumper *dumper,
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const char *new_msgs, unsigned long new_len)
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{
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static unsigned int oops_count = 0;
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static bool panicking = false;
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size_t text_len;
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switch (reason) {
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case KMSG_DUMP_RESTART:
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case KMSG_DUMP_HALT:
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case KMSG_DUMP_POWEROFF:
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/* These are almost always orderly shutdowns. */
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return;
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case KMSG_DUMP_OOPS:
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case KMSG_DUMP_KEXEC:
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break;
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case KMSG_DUMP_PANIC:
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panicking = true;
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break;
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case KMSG_DUMP_EMERG:
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if (panicking)
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/* Panic report already captured. */
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return;
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break;
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default:
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pr_err("%s: ignoring unrecognized KMSG_DUMP_* reason %d\n",
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__FUNCTION__, (int) reason);
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return;
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}
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if (clobbering_unread_rtas_event())
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return;
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