linux-kernel - Re: [PATCH v6 0/2] Add HARDLOCKUP_DETECTOR

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Message-ID: <CAD=FV=Vh-guJS+5BAqhao9aECtkRFgoqEjpzhuDYEsRVqtVA6w@mail.gmail.com>
Date: Fri, 14 Nov 2025 11:13:57 -0800
From: Doug Anderson <dianders@...omium.org>
To: Yunhui Cui <cuiyunhui@...edance.com>
Cc: akpm@...ux-foundation.org, alex@...ti.fr, anup@...infault.org, 
	aou@...s.berkeley.edu, atish.patra@...ux.dev, catalin.marinas@....com, 
	johannes@...solutions.net, lihuafei1@...wei.com, mark.rutland@....com, 
	masahiroy@...nel.org, maz@...nel.org, mingo@...nel.org, 
	nicolas.schier@...ux.dev, palmer@...belt.com, paul.walmsley@...ive.com, 
	suzuki.poulose@....com, thorsten.blum@...ux.dev, wangjinchao600@...il.com, 
	will@...nel.org, yangyicong@...ilicon.com, zhanjie9@...ilicon.com, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v6 0/2] Add HARDLOCKUP_DETECTOR_PERF support for RISC-V

Hi,

On Thu, Nov 13, 2025 at 7:33 PM Yunhui Cui <cuiyunhui@...edance.com> wrote:
>
> After discussion [1],[2], hardlockup_perf cannot be completely replaced by
> the hardlockup_buddy approach, so this patch is still being submitted.
>
> v1->v2:
> The contents of arch/arm64/watchdog_hld.c are directly consolidated into
> kernel/watchdog_perf.c.
>
>
> v2->v3:
> Add CONFIG_WATCHDOG_PERF_ADJUST_PERIOD to enclose the period update logic,
> select it by default on arm64 and riscv, without affecting other arches
> like x86 and PPC.
>
> v3->v4:
> Place the line "select WATCHDOG_PERF_ADJUST_PERIOD if HARDLOCKUP_DETECTOR_PERF && CPU_FREQ"
> in the Kconfig files for arm64 and riscv in one line, with no line breaks.
>
> v4->v5:
> Remove __weak from hw_nmi_get_sample_period()
>
> v5->v6:
> Removed the dependency on CPU_FREQ for WATCHDOG_PERF_ADJUST_PERIOD in Kconfig, which fixes the
> issue reported at: https://lore.kernel.org/oe-kbuild-all/202510240701.eB6r97V3-lkp@intel.com/

I haven't tried compiling this myself, but it seems like an OK
solution for the compile-time error to me.

-Doug