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Date:   Thu, 4 Apr 2019 20:14:08 +0200 (CEST)
From:   Thomas Gleixner <tglx@linutronix.de>
To:     Fenghua Yu <fenghua.yu@intel.com>
cc:     Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        H Peter Anvin <hpa@zytor.com>,
        Dave Hansen <dave.hansen@intel.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Ashok Raj <ashok.raj@intel.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Kalle Valo <kvalo@codeaurora.org>,
        Xiaoyao Li <xiaoyao.li@intel.com>,
        Michael Chan <michael.chan@broadcom.com>,
        Ravi V Shankar <ravi.v.shankar@intel.com>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        x86 <x86@kernel.org>, linux-wireless@vger.kernel.org,
        netdev@vger.kernel.org, kvm@vger.kernel.org
Subject: Re: [PATCH v6 13/20] x86/split_lock: Enable split lock detection by
 default
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References: <1554326526-172295-1-git-send-email-fenghua.yu@intel.com> <1554326526-172295-14-git-send-email-fenghua.yu@intel.com> <alpine.DEB.2.21.1904041932500.1802@nanos.tec.linutronix.de>
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On Thu, 4 Apr 2019, Thomas Gleixner wrote:
> On Wed, 3 Apr 2019, Fenghua Yu wrote:
> > +static void init_split_lock_detect(struct cpuinfo_x86 *c)
> > +{
> > +	if (cpu_has(c, X86_FEATURE_SPLIT_LOCK_DETECT)) {
> > +		u32 l, h;
> > +
> > +		mutex_lock(&split_lock_detect_mutex);

The mutex protects what exactly in the cpu bringup code?

Thanks,

	tglx