linux-kernel - Re: [PATCH v9 6/7] kgdb: Provide a stub kgdb_nmicallback() if !CONFIG

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Date:   Mon, 26 Jun 2023 15:30:38 +0100
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Doug Anderson <dianders@...omium.org>
Cc:     Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Sumit Garg <sumit.garg@...aro.org>,
        Marc Zyngier <maz@...nel.org>,
        linux-perf-users@...r.kernel.org, ito-yuichi@...itsu.com,
        Chen-Yu Tsai <wens@...e.org>, Ard Biesheuvel <ardb@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-arm-kernel@...ts.infradead.org,
        kgdb-bugreport@...ts.sourceforge.net,
        Masayoshi Mizuma <msys.mizuma@...il.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Lecopzer Chen <lecopzer.chen@...iatek.com>,
        Jason Wessel <jason.wessel@...driver.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 6/7] kgdb: Provide a stub kgdb_nmicallback() if
 !CONFIG_KGDB

On Thu, Jun 15, 2023 at 11:14:18AM -0700, Doug Anderson wrote:
> Daniel,
>
> On Thu, Jun 1, 2023 at 2:37 PM Douglas Anderson <dianders@...omium.org> wrote:
> >
> > To save architectures from needing to wrap the call in #ifdefs, add a
> > stub no-op version of kgdb_nmicallback(), which returns 1 if it didn't
> > handle anything.
> >
> > Reviewed-by: Daniel Thompson <daniel.thompson@...aro.org>
> > Signed-off-by: Douglas Anderson <dianders@...omium.org>
> > ---
> > In v9 this is the only kgdb dependency. I'm assuming it could go
> > through the arm64 tree? If that's not a good idea, we could always
> > change the patch ("arm64: kgdb: Roundup cpus using IPI as NMI") not to
> > depend on it by only calling kgdb_nmicallback() if CONFIG_KGDB is not
> > defined.
> >
> > Changes in v9:
> > - Added missing "inline"
> >
> > Changes in v8:
> > - "Provide a stub kgdb_nmicallback() if !CONFIG_KGDB" new for v8
> >
> >  include/linux/kgdb.h | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/include/linux/kgdb.h b/include/linux/kgdb.h
> > index 258cdde8d356..76e891ee9e37 100644
> > --- a/include/linux/kgdb.h
> > +++ b/include/linux/kgdb.h
> > @@ -365,5 +365,6 @@ extern void kgdb_free_init_mem(void);
> >  #define dbg_late_init()
> >  static inline void kgdb_panic(const char *msg) {}
> >  static inline void kgdb_free_init_mem(void) { }
> > +static inline int kgdb_nmicallback(int cpu, void *regs) { return 1; }
>
> What do you think about landing just ${SUBJECT} patch in kgdb right
> now so it can end up in v6.5-rc1? It seems like this series is
> currently blocked on Mark getting a spare moment and it seems unlikely
> that'll happen this cycle. If we at least land the kgdb patch then it
> would make things all that much easier to land in the next cycle. The
> kgdb patch feels like it can make sense on its own...

Yes, grabbing this one should be fine!


Daniel.