powerpc/nvram: Don't overwrite oops/panic report on normal shutdown (15d260b3) · Commits · 戴 / test

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>

arch/powerpc/platforms/pseries/nvram.c

+24 −0

Original line number	Original line	Diff line number	Diff line
	@@ -480,8 +480,32 @@ static void oops_to_nvram(struct kmsg_dumper *dumper,
	const char *new_msgs, unsigned long new_len)		const char *new_msgs, unsigned long new_len)
	{		{
	static unsigned int oops_count = 0;		static unsigned int oops_count = 0;
			static bool panicking = false;
	size_t text_len;		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())		if (clobbering_unread_rtas_event())
	return;		return;

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