Hi Guenter,
Thanks for the review.
> On 02/29/2016 05:50 PM, Hidehiro Kawai wrote:
> > commit 58c5661f2144 ("panic, x86: Allow CPUs to save registers even
> > if looping in NMI context") introduced nmi_panic() which prevents
> > concurrent/recursive execution of panic(). It also saves registers
> > for the crash dump on x86.
> >
> > hpwdt driver can call panic() from NMI handler, so replace it with
> > nmi_panic().
> >
> > Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@xxxxxxxxxxx>
> > Cc: Thomas Mingarelli <thomas.mingarelli@xxxxxxx>
> > Cc: Wim Van Sebroeck <wim@xxxxxxxxx>
> > Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
> > Cc: linux-watchdog@xxxxxxxxxxxxxxx
> > ---
> > drivers/watchdog/hpwdt.c | 12 ++++++++++--
> > 1 file changed, 10 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c
> > index 92443c3..fd0486f 100644
> > --- a/drivers/watchdog/hpwdt.c
> > +++ b/drivers/watchdog/hpwdt.c
> > @@ -496,11 +496,12 @@ static int hpwdt_pretimeout(unsigned int ulReason, struct pt_regs *regs)
> >
> > if (!is_icru && !is_uefi) {
> > if (cmn_regs.u1.ral == 0) {
> > - panic("An NMI occurred, "
> > + nmi_panic(regs, "An NMI occurred, "
> > "but unable to determine source.\n");
>
> This message should really be in a single line.
> Sure, strictly speaking that should be done in a separate patch,
> but since you touch the line you might as well fix it.
OK, I'll combine them.
> > + goto handled;
>
> The goto is unnecessary. Just return NMI_HANDLED.
Sure, I'll do that.
>
> > }
> > }
> > - panic("An NMI occurred. Depending on your system the reason "
> > + nmi_panic(regs, "An NMI occurred. Depending on your system the reason "
> > "for the NMI is logged in any one of the following "
> > "resources:\n"
> > "1. Integrated Management Log (IML)\n"
> > @@ -508,6 +509,13 @@ static int hpwdt_pretimeout(unsigned int ulReason, struct pt_regs *regs)
> > "3. OA Forward Progress Log\n"
> > "4. iLO Event Log");
> >
> > +handled:
> > + /*
> > + * Returning from nmi_panic() means this CPU was processing panic()
> > + * before NMI. Return NMI_HANDLED and go back to panic routines.
> > + */
>
> I don't think this comment adds much if any value.
So, I remove this comment. NMI_HANDLED would be self-explanatory.
> > + return NMI_HANDLED;
> > +
> > out:
>
> Any goto to this label does no longer serve a useful purpose (if it ever served one),
> and should be replaced with "return NMI_DONE;"
I'll fix it. It will become a bit simpler.
Thanks,
--
Hidehiro Kawai
Hitachi, Ltd. Research & Development Group
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