linux-kernel - Re: [PATCH] mm/thp: Make ARCH_ENABLE_SPLIT_PMD_PTLOCK dependent on PGTABLE

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Message-ID: <843e545a-ca0c-6a1e-2ab0-28ccca182400@arm.com>
Date:   Mon, 10 May 2021 15:36:29 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     linux-mm@...ck.org, akpm@...ux-foundation.org,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/thp: Make ARCH_ENABLE_SPLIT_PMD_PTLOCK dependent on
 PGTABLE_LEVELS > 2



On 5/10/21 2:23 PM, Peter Zijlstra wrote:
> On Mon, May 10, 2021 at 10:05:45AM +0530, Anshuman Khandual wrote:
>> -	select ARCH_ENABLE_SPLIT_PMD_PTLOCK if X86_64 || X86_PAE
>> +	select ARCH_ENABLE_SPLIT_PMD_PTLOCK if (PGTABLE_LEVELS > 2) && (X86_64 || X86_PAE)
> 
> It's still very early on a Monday, but IIRC this new condition is
> identical to the pre-existing one.

Did not get it, could you please elaborate ?