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kernel/panic.c: add "crash_kexec_post_notifiers" option for kdump aft…
…er panic_notifers Add a "crash_kexec_post_notifiers" boot option to run kdump after running panic_notifiers and dump kmsg. This can help rare situations where kdump fails because of unstable crashed kernel or hardware failure (memory corruption on critical data/code), or the 2nd kernel is already broken by the 1st kernel (it's a broken behavior, but who can guarantee that the "crashed" kernel works correctly?). Usage: add "crash_kexec_post_notifiers" to kernel boot option. Note that this actually increases risks of the failure of kdump. This option should be set only if you worry about the rare case of kdump failure rather than increasing the chance of success. Signed-off-by: Masami Hiramatsu <[email protected]> Acked-by: Motohiro Kosaki <[email protected]> Acked-by: Vivek Goyal <[email protected]> Cc: Eric Biederman <[email protected]> Cc: Yoshihiro YUNOMAE <[email protected]> Cc: Satoru MORIYA <[email protected]> Cc: Tomoki Sekiyama <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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