linux-kernel - Re: [External] Re: [PATCH 1/2] watchdog: refactor watchdog

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Message-ID: <CAEEQ3wmBvevbkP8XmwR0_q_1QWQsie5g0UUxTFm6ovS1m41pEQ@mail.gmail.com>
Date: Mon, 1 Sep 2025 13:57:20 +0800
From: yunhui cui <cuiyunhui@...edance.com>
To: Doug Anderson <dianders@...omium.org>
Cc: paul.walmsley@...ive.com, palmer@...belt.com, aou@...s.berkeley.edu, 
	alex@...ti.fr, atish.patra@...ux.dev, anup@...infault.org, will@...nel.org, 
	mark.rutland@....com, linux-riscv@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-perf-users@...r.kernel.org, catalin.marinas@....com, 
	masahiroy@...nel.org, suzuki.poulose@....com, maz@...nel.org, 
	zhanjie9@...ilicon.com, yangyicong@...ilicon.com, mingo@...nel.org, 
	lihuafei1@...wei.com, akpm@...ux-foundation.org, jpoimboe@...nel.org, 
	rppt@...nel.org, kees@...nel.org, thomas.weissschuh@...utronix.de
Subject: Re: [External] Re: [PATCH 1/2] watchdog: refactor watchdog_hld functionality

Hi Doug,

On Sat, Aug 30, 2025 at 5:34 AM Doug Anderson <dianders@...omium.org> wrote:
>
> Hi,
>
> On Wed, Aug 27, 2025 at 3:10 AM Yunhui Cui <cuiyunhui@...edance.com> wrote:
> >
> > Move watchdog_hld.c to kernel/, and rename arm_pmu_irq_is_nmi()
> > to arch_pmu_irq_is_nmi() for cross-arch reusability.
> >
> > Signed-off-by: Yunhui Cui <cuiyunhui@...edance.com>
> > ---
> >  arch/arm64/kernel/Makefile                   | 1 -
> >  drivers/perf/arm_pmu.c                       | 2 +-
> >  include/linux/nmi.h                          | 1 +
> >  include/linux/perf/arm_pmu.h                 | 2 --
> >  kernel/Makefile                              | 2 +-
> >  {arch/arm64/kernel => kernel}/watchdog_hld.c | 8 ++++++--
> >  6 files changed, 9 insertions(+), 7 deletions(-)
> >  rename {arch/arm64/kernel => kernel}/watchdog_hld.c (97%)
>
> I'm not a huge fan of the perf hardlockup detector and IMO we should
> maybe just delete it. Thus spreading it to support a new architecture
> isn't my favorite thing to do. Can't you use the buddy hardlockup
> detector?

Why is there a plan to remove CONFIG_HARDLOCKUP_DETECTOR_PERF? Could
you explain the specific reasons? Is the community's future plan to
favor CONFIG_HARDLOCKUP_DETECTOR_BUDDY?

>
> That being said, I did a quick look at your patch. I'm pretty sure you
> can't just move the arm64 "watchdog_hld.c" to be generic. Won't
> hw_nmi_get_sample_period() conflict with everyone else's (x86 and
> powerpc)?
>
> -Doug
>

Thanks,
Yunhui