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Date:   Thu, 18 Apr 2019 00:47:24 +0200 (CEST)
From:   Thomas Gleixner <>
To:     Fenghua Yu <>
cc:     Ingo Molnar <>, Borislav Petkov <>,
        H Peter Anvin <>,
        Paolo Bonzini <>,
        Dave Hansen <>,
        Ashok Raj <>,
        Peter Zijlstra <>,
        Ravi V Shankar <>,
        Xiaoyao Li <>,
        Christopherson Sean J <>,
        Kalle Valo <>,
        Michael Chan <>,
        linux-kernel <>,
        x86 <>,,,
Subject: Re: [PATCH v7 15/21] x86/split_lock: Add a sysfs interface to
 enable/disable split lock detection during run time

On Wed, 17 Apr 2019, Fenghua Yu wrote:

> The interface /sys/device/system/cpu/split_lock_detect is added
> to allow user to control split lock detection and show current split
> lock detection setting.
> Writing [yY1] or [oO][nN] to the file enables split lock detection and
> writing [nN0] or [oO][fF] disables split lock detection. Split lock
> detection is enabled or disabled on all CPUs.
> Reading the file returns current global split lock detection setting:
> 0: disabled
> 1: enabled

Again, You explain WHAT this patch does and still there is zero
justification why this sysfs knob is needed at all. I still do not see any
reason why this knob should exist.



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