linux-kernel - Re: [PATCH] arm64: fix HARDLOCKUP

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Date:   Fri, 4 Dec 2020 09:27:11 +0000
From:   Will Deacon <will@...nel.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Sumit Garg <sumit.garg@...aro.org>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Mark Brown <broonie@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: fix HARDLOCKUP_DETECTOR dependency

Hi Arnd,

On Thu, Dec 03, 2020 at 11:27:26PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> When CONFIG_HW_PERF_EVENTS is disabled, the hardware lockup detector
> fails to link:
> 
> ld.lld: error: undefined symbol: hw_nmi_get_sample_period
> >>> referenced by watchdog_hld.c
> >>>               watchdog_hld.o:(hardlockup_detector_event_create) in archive kernel/built-in.a
> 
> Fix the dependency to refer to the Kconfig symbol that actually controls
> the feature.
> 
> Fixes: 367c820ef080 ("arm64: Enable perf events based hard lockup detector")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  arch/arm64/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 7599ad86e9a8..ecd900ad7755 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -176,7 +176,7 @@ config ARM64
>  	select HAVE_PATA_PLATFORM
>  	select HAVE_PERF_EVENTS
>  	select HAVE_PERF_EVENTS_NMI if ARM64_PSEUDO_NMI
> -	select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI
> +	select HAVE_HARDLOCKUP_DETECTOR_PERF if HW_PERF_EVENTS && HAVE_PERF_EVENTS_NMI
>  	select HAVE_PERF_REGS
>  	select HAVE_PERF_USER_STACK_DUMP
>  	select HAVE_REGS_AND_STACK_ACCESS_API

Cheers, although I already have a fix for this one queued locally [1].
I'll push it out in sec (ran out of time yesterday).

Will

[1] https://lore.kernel.org/r/202012031509.4O5ZoWNI-lkp@intel.com