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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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04c6862c05
We need to know the reason why system rebooted in support service. However, we can't inform our customers of the reason because final messages are lost on current Linux kernel. This patch improves the situation above because the final messages are saved by adding kmsg_dump() to reboot, halt, poweroff and emergency_restart path. Signed-off-by: Seiji Aguchi <seiji.aguchi@hds.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Marco Stornelli <marco.stornelli@gmail.com> Reviewed-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
/*
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* linux/include/kmsg_dump.h
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*
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* Copyright (C) 2009 Net Insight AB
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*
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* Author: Simon Kagstrom <simon.kagstrom@netinsight.net>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#ifndef _LINUX_KMSG_DUMP_H
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#define _LINUX_KMSG_DUMP_H
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#include <linux/list.h>
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enum kmsg_dump_reason {
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KMSG_DUMP_OOPS,
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KMSG_DUMP_PANIC,
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KMSG_DUMP_KEXEC,
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KMSG_DUMP_RESTART,
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KMSG_DUMP_HALT,
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KMSG_DUMP_POWEROFF,
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KMSG_DUMP_EMERG,
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};
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/**
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* struct kmsg_dumper - kernel crash message dumper structure
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* @dump: The callback which gets called on crashes. The buffer is passed
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* as two sections, where s1 (length l1) contains the older
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* messages and s2 (length l2) contains the newer.
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* @list: Entry in the dumper list (private)
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* @registered: Flag that specifies if this is already registered
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*/
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struct kmsg_dumper {
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void (*dump)(struct kmsg_dumper *dumper, enum kmsg_dump_reason reason,
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const char *s1, unsigned long l1,
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const char *s2, unsigned long l2);
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struct list_head list;
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int registered;
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};
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#ifdef CONFIG_PRINTK
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void kmsg_dump(enum kmsg_dump_reason reason);
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int kmsg_dump_register(struct kmsg_dumper *dumper);
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int kmsg_dump_unregister(struct kmsg_dumper *dumper);
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#else
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static inline void kmsg_dump(enum kmsg_dump_reason reason)
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{
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}
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static inline int kmsg_dump_register(struct kmsg_dumper *dumper)
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{
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return -EINVAL;
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}
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static inline int kmsg_dump_unregister(struct kmsg_dumper *dumper)
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{
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return -EINVAL;
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}
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#endif
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#endif /* _LINUX_KMSG_DUMP_H */
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