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Thu, 23 Apr 2020 06:12:25 -0700 (PDT) Received: from N-20L6PF1KTYA2 ([131.228.2.21]) by smtp.gmail.com with ESMTPSA id q19sm1734368ljj.84.2020.04.23.06.12.23 (version=TLS1_2 cipher=AES128-GCM-SHA256 bits=128/128); Thu, 23 Apr 2020 06:12:25 -0700 (PDT) Date: Thu, 23 Apr 2020 21:12:23 +0800 From: "Li Xinhai" To: "linux-mm@kvack.org" Cc: "Mike Kravetz" , akpm Subject: Re: [PATCH] mm/hugetlb: avoid unnecessary check on pud and pmd entry in huge_pte_offset References: <1587646154-26276-1-git-send-email-lixinhai.lxh@gmail.com> X-Priority: 3 X-GUID: 4155ACF0-069F-4554-970F-B45EBCFB01B6 X-Has-Attach: no X-Mailer: Foxmail 7.2.13.365[cn] Mime-Version: 1.0 Message-ID: <202004232112215571429@gmail.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000339, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: T24gMjAyMC0wNC0yM8KgYXQgMjA6NDnCoExpIFhpbmhhacKgd3JvdGU6Cj5XaGVuIGh1Z2VfcHRl X29mZnNldCgpIGlzIGNhbGxlZCwgdGhlIHBhcmFtZXRlciBzeiBjYW4gb25seSBiZSBQVURfU0la RQo+b3IgUE1EX1NJWkUuCj5JZiBzeiBpcyBQVURfU0laRSBhbmQgY29kZSBjYW4gcmVhY2ggcHVk LCB0aGVuICpwdWQgbXVzdCBiZSBub25lLCBvcgo+bm9ybWFsIGh1Z2V0bGIgZW50cnksIG9yIG5v bi1wcmVzZW50IChtaWdyYXRpb24gb3IgaHdwb2lzb25lZCkgaHVnZXRsYgo+ZW50cnksIGFuZCB3 ZSBjYW4gZGlyZWN0bHkgcmV0dXJuIHB1ZC4KPldoZW4gc3ogaXMgUE1EX1NJWkUsIHB1ZCBtdXN0 IGJlIG5vbmUgb3IgcHJlc2VudCwgYW5kIGlmIGNvZGUgY2FuIHJlYWNoCj5wbWQsIHdlIGNhbiBk aXJlY3RseSByZXR1cm4gcG1kLgo+Cj5TbywgYWZ0ZXIgdGhpcyBwYXRjaCwgdGhlIGNvZGUgaXMg c2ltcGxpZmllZCBieSBmaXJzdCBjaGVjayBvbiB0aGUKPnBhcmFtZXRlciBzeiwgYW5kIGF2b2lk IHVubmVjZXNzYXJ5IGNoZWNrcyBpbiBjdXJyZW50IGNvZGUuCj4KPlNpZ25lZC1vZmYtYnk6IExp IFhpbmhhaSA8bGl4aW5oYWkubHhoQGdtYWlsLmNvbT4KPkNjOiBNaWtlIEtyYXZldHogPG1pa2Uu a3JhdmV0ekBvcmFjbGUuY29tPgo+Q2M6IEFuZHJldyBNb3J0b24gPGFrcG1AbGludXgtZm91bmRh dGlvbi5vcmc+IAoKU2luY2UgdGhpcyBodWdlX3B0ZV9vZmZzZXQoKSBpcyB1bmRlcsKgQ09ORklH X0FSQ0hfV0FOVF9HRU5FUkFMX0hVR0VUTEIswqAKSSBvbmx5IGhhdmUgY2hhbmNlIHRvIHRlc3Qg d2l0aCB4ODZfNjQsIGJ1dCB0aGUgbG9naWNhbCBzaG91bGQgaG9sZCBmb3IgYWxsIG90aGVyCmNh c2VzIHdoaWNoIHVzaW5nIHRoaXMgZ2VuZXJhbCBpbXBsZW1lbnRhdGlvbi4KClRoZSBleHNpdGlu ZyBjb2RlIHBhdGggd2FzIGludHJvZHVjZWQgYnnCoGNvbW1pdCA5YjE5ZGYyOTJjNiAobW0vaHVn ZXRsYi5jOgptYWtlIGh1Z2VfcHRlX29mZnNldCgpIGNvbnNpc3RlbnQgYW5kIGRvY3VtZW50IGJl aGF2aW91ciksIGFuZCB0aGUgc2VtYXRpY3MKaXPCoG1haW50YWluZWQgYWZ0ZXIgY3VycmVudCBw YXRjaCBhcHBsaWVkLgoK