linux-kernel - Re: [PATCH 4/6] x86/bugs: Use ALTERNATIVE() instead of mds_user

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Message-ID: <20231023210920.p53cxpxptocpgcw4@desk>
Date:   Mon, 23 Oct 2023 14:09:20 -0700
From:   Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
To:     Josh Poimboeuf <jpoimboe@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>, tony.luck@...el.com,
        ak@...ux.intel.com, tim.c.chen@...ux.intel.com,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        kvm@...r.kernel.org,
        Alyssa Milburn <alyssa.milburn@...ux.intel.com>,
        Daniel Sneddon <daniel.sneddon@...ux.intel.com>,
        antonio.gomez.iglesias@...ux.intel.com
Subject: Re: [PATCH  4/6] x86/bugs: Use ALTERNATIVE() instead of
 mds_user_clear static key

On Mon, Oct 23, 2023 at 11:48:44AM -0700, Josh Poimboeuf wrote:
> On Fri, Oct 20, 2023 at 01:45:15PM -0700, Pawan Gupta wrote:
> > @@ -484,11 +484,11 @@ static void __init md_clear_update_mitigation(void)
> >  	if (cpu_mitigations_off())
> >  		return;
> >  
> > -	if (!static_key_enabled(&mds_user_clear))
> > +	if (!boot_cpu_has(X86_FEATURE_USER_CLEAR_CPU_BUF))
> >  		goto out;
> >  
> >  	/*
> > -	 * mds_user_clear is now enabled. Update MDS, TAA and MMIO Stale Data
> > +	 * X86_FEATURE_USER_CLEAR_CPU_BUF is now enabled. Update MDS, TAA and MMIO Stale Data
> >  	 * mitigation, if necessary.
> >  	 */
> 
> This comment line got long, the paragraph can be reformatted.

Yes, will fix.