Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Subject: Re: [PATCH] mm/thp: Make ARCH_ENABLE_SPLIT_PMD_PTLOCK dependent on
 PGTABLE_LEVELS > 2
To:     Peter Zijlstra <peterz@infradead.org>
Cc:     linux-mm@kvack.org, akpm@linux-foundation.org,
        Heiko Carstens <hca@linux.ibm.com>,
        Vasily Gorbik <gor@linux.ibm.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, x86@kernel.org,
        linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org
References: <1620621345-29176-1-git-send-email-anshuman.khandual@arm.com>
 <20210510085313.GB5618@worktop.programming.kicks-ass.net>
From:   Anshuman Khandual <anshuman.khandual@arm.com>
Message-ID: <843e545a-ca0c-6a1e-2ab0-28ccca182400@arm.com>
Date:   Mon, 10 May 2021 15:36:29 +0530
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101
 Thunderbird/68.10.0
MIME-Version: 1.0
In-Reply-To: <20210510085313.GB5618@worktop.programming.kicks-ass.net>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Precedence: bulk


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 ?