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

From: Don Zickus
Date: Tue Jul 19 2011 - 14:54:34 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.
> @@ -1081,6 +1083,7 @@ void crash_kexec(struct pt_regs *regs)
> crash_setup_regs(&fixed_regs, regs);
> crash_save_vmcoreinfo();
> machine_crash_shutdown(&fixed_regs);
> + pstore_kmsg_dump_in_interrupt(KMSG_DUMP_KEXEC);
> Seiji

Another interesting question is do we need to log anything in the kdump
path? Isn't kdump generating the same info? What added value do we get
over kdump?

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