Hidehiro Kawai <hidehiro.kawai.ez@xxxxxxxxxxx> writes:
> You can call panic notifiers and kmsg dumpers before kdump by
> specifying "crash_kexec_post_notifiers" as a boot parameter.
> However, it doesn't make sense if kdump is not available. In that
> case, disable "crash_kexec_post_notifiers" boot parameter so that
> you can't change the value of the parameter.
Nacked-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
You are confusing kexec on panic and CONFIG_CRASH_DUMP
which is about the tools for reading the state of the previous kernel.
Eric
> Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@xxxxxxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Cc: Eric Biederman <ebiederm@xxxxxxxxxxxx>
> Cc: Vivek Goyal <vgoyal@xxxxxxxxxx>
> ---
> kernel/panic.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/kernel/panic.c b/kernel/panic.c
> index 04e91ff..5252331 100644
> --- a/kernel/panic.c
> +++ b/kernel/panic.c
> @@ -502,12 +502,14 @@ __visible void __stack_chk_fail(void)
> core_param(pause_on_oops, pause_on_oops, int, 0644);
> core_param(panic_on_warn, panic_on_warn, int, 0644);
>
> +#ifdef CONFIG_CRASH_DUMP
> static int __init setup_crash_kexec_post_notifiers(char *s)
> {
> crash_kexec_post_notifiers = true;
> return 0;
> }
> early_param("crash_kexec_post_notifiers", setup_crash_kexec_post_notifiers);
> +#endif
>
> static int __init oops_setup(char *s)
> {
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