linux-kernel - Re: [PATCH] [RFC] arm64: export this_cpu_has

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Date:   Fri, 29 Oct 2021 09:12:33 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Suzuki K Poulose <suzuki.poulose@....com>
Cc:     Arnd Bergmann <arnd@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Arnd Bergmann <arnd@...db.de>, Marc Zyngier <maz@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        David Brazdil <dbrazdil@...gle.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] [RFC] arm64: export this_cpu_has_cap

On Fri, 29 Oct 2021 at 07:31, Suzuki K Poulose <suzuki.poulose@....com> wrote:
>
> Hi Arnd
>
> Thanks for the fix.
>
> On 29/10/2021 12:30, Arnd Bergmann wrote:
> > From: Arnd Bergmann <arnd@...db.de>
> >
> > It's now used in a coresight driver that can be a loadable module:
> >
> > ERROR: modpost: "this_cpu_has_cap" [drivers/hwtracing/coresight/coresight-trbe.ko] undefined!
> >
> > Fixes: 8a1065127d95 ("coresight: trbe: Add infrastructure for Errata handling")
>
> Reviewed-by: Suzuki K Poulose <suzuki.poulose@....com>
> Tested-by: Suzuki K Poulose <suzuki.poulose@....com>
>
> Will, Catalin, Mathieu,
>
> Do you have a preference on how this fix can be pulled in ? This may
> be safe to go via coresight tree if it is not too late. Otherwise,
> it could go via the arm64 tree.

All the same to me.  It's in arm64 so I'll let Will and Catalin have
the final word.

>
> Suzuki
>
> > Signed-off-by: Arnd Bergmann <arnd@...db.de>
> > ---
> > Not sure if we actually want this to be exported, this is my local
> > workaround for the randconfig build bot.
> > ---
> >   arch/arm64/kernel/cpufeature.c | 1 +
> >   1 file changed, 1 insertion(+)
> >
> > diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
> > index ecbdff795f5e..beccbcfa7391 100644
> > --- a/arch/arm64/kernel/cpufeature.c
> > +++ b/arch/arm64/kernel/cpufeature.c
> > @@ -2864,6 +2864,7 @@ bool this_cpu_has_cap(unsigned int n)
> >
> >       return false;
> >   }
> > +EXPORT_SYMBOL(this_cpu_has_cap);
> >
> >   /*
> >    * This helper function is used in a narrow window when,
> >
>