linux-kernel - Re: [PATCH v4 1/2] x86/mce: Check for writes ignored in MCA

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Message-ID: <YlcwbuOZ2qaPLPR5@zn.tnic>
Date:   Wed, 13 Apr 2022 22:19:58 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
Cc:     x86@...nel.org, linux-edac@...r.kernel.org,
        linux-kernel@...r.kernel.org, Tony Luck <tony.luck@...el.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        Yazen Ghannam <yazen.ghannam@....com>
Subject: Re: [PATCH v4 1/2] x86/mce: Check for writes ignored in MCA_STATUS
 register

On Wed, Apr 13, 2022 at 12:16:26PM -0700, Smita Koralahalli wrote:
> > diff --git a/arch/x86/kernel/cpu/mce/internal.h b/arch/x86/kernel/cpu/mce/internal.h
> > index 4ae0e603f7fa..7e03f5b7f6bd 100644
> > --- a/arch/x86/kernel/cpu/mce/internal.h
> > +++ b/arch/x86/kernel/cpu/mce/internal.h
> > @@ -211,7 +211,7 @@ noinstr u64 mce_rdmsrl(u32 msr);
> >   static __always_inline u32 mca_msr_reg(int bank, enum mca_msr reg)
> >   {
> > -	if (mce_flags.smca) {
> > +	if (cpu_feature_enabled(X86_FEATURE_SMCA)) {
> Should this change be part of this patch series? Also, why mce_flags.smca
> check won't work?

Because you'd need to export it to modules and mca_flags is not
something I'd want to export to anything.

-- 
Regards/Gruss,
    Boris.

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