Re: [RFC][PATCH -mmotm 1/4] Add static function calls of pstore tokexec path

From: Matthew Garrett
Date: Tue Jul 19 2011 - 14:52:21 EST

On Tue, Jul 19, 2011 at 02:48:22PM -0400, Seiji Aguchi wrote:
> >How is this safe? What happens if there's a pstore access in process
> >when you hit this codepath?
> This will never happen because pstore_kmsg_dump_in_interrupt() is called after machine_crash_shutdown().
> Panicked cpu sends NMI to all other cpus in machine_crash_shutdown() and they stop.

And how does that handle the case where we're halfway through a pstore
access when the NMI arrives? ERST, at least, has a complex state
machine. You can't guarantee what starting one transaction without
completing one that was in process will do.

Matthew Garrett | mjg59@xxxxxxxxxxxxx
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