linux-kernel - RE: [PATCH v12] x86/split_lock: Enable split lock detection by kernel

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Date:   Wed, 22 Jan 2020 20:03:28 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Borislav Petkov <bp@...en8.de>
CC:     Thomas Gleixner <tglx@...utronix.de>,
        "Christopherson, Sean J" <sean.j.christopherson@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        "Ingo Molnar" <mingo@...hat.com>, H Peter Anvin <hpa@...or.com>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        linux-kernel <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>
Subject: RE: [PATCH v12] x86/split_lock: Enable split lock detection by
 kernel

>> +#define X86_FEATURE_SPLIT_LOCK_DETECT	( 7*32+31) /* #AC for split lock */
>
> That word is already full in tip:
> ...
> use word 11 instead.

Will rebase against tip/master and move to word 11.

>> +#define MSR_IA32_CORE_CAPABILITIES			  0x000000cf
>> +#define MSR_IA32_CORE_CAPABILITIES_SPLIT_LOCK_DETECT_BIT  5
>> +#define MSR_IA32_CORE_CAPABILITIES_SPLIT_LOCK_DETECT	  BIT(MSR_IA32_CORE_CAPABILITIES_SPLIT_LOCK_DETECT_BIT)
>
> Any chance making those shorter?

I could abbreviate CAPABILITIES as "CAP", that would save 9 characters. Is that enough?

I'm not fond of the "remove the vowels": SPLT_LCK_DTCT, but that is sort of readable
and would save 4 more. What do you think?

-Tony