On Fri, 25 Sep 2015, Hidehiro Kawai wrote: > This patch introduces new boot option "noextnmi" which disables > external NMI. This option is useful for the dump capture kernel > so that an HA application or administrator wouldn't mistakenly > shoot down the kernel by NMI. > > Currently, only x86 supports this option.
You might add that is can be used for debugging purposes as well. External NMIs can be their own source of trouble. :) > Signed-off-by: Hidehiro Kawai <hidehiro.kawai...@hitachi.com> > Cc: Thomas Gleixner <t...@linutronix.de> > Cc: Ingo Molnar <mi...@redhat.com> > Cc: "H. Peter Anvin" <h...@zytor.com> > Cc: Jonathan Corbet <cor...@lwn.net> > --- > Documentation/kernel-parameters.txt | 4 ++++ > arch/x86/kernel/apic/apic.c | 17 ++++++++++++++++- > 2 files changed, 20 insertions(+), 1 deletion(-) > > diff --git a/Documentation/kernel-parameters.txt > b/Documentation/kernel-parameters.txt > index 22a4b68..8bcaccd 100644 > --- a/Documentation/kernel-parameters.txt > +++ b/Documentation/kernel-parameters.txt > @@ -2379,6 +2379,10 @@ bytes respectively. Such letter suffixes can also be > entirely omitted. > noexec=on: enable non-executable mappings (default) > noexec=off: disable non-executable mappings > > + noextnmi [X86] > + Mask external NMI. This option is useful for a > + dump capture kernel to be shot down by NMI. That should read: "...not to be shot down", right? Other than that. Acked-by: Thomas Gleixner <t...@linutronix.de> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
