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;
From:   Christophe Leroy <christophe.leroy@csgroup.eu>
To:     Kefeng Wang <wangkefeng.wang@huawei.com>,
        Jonathan Corbet <corbet@lwn.net>,
        Andrew Morton <akpm@linux-foundation.org>,
        "linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
        "linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
        "x86@kernel.org" <x86@kernel.org>,
        "linux-arm-kernel@lists.infradead.org" 
        <linux-arm-kernel@lists.infradead.org>
CC:     Nicholas Piggin <npiggin@gmail.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        Matthew Wilcox <willy@infradead.org>
Subject: Re: [PATCH v2 2/3] arm64: Support huge vmalloc mappings
Thread-Topic: [PATCH v2 2/3] arm64: Support huge vmalloc mappings
Thread-Index: AQHX+zD+yDp+cuhsWUOBkGxD6/Q9HKxj+JQA
Date:   Sat, 15 Jan 2022 10:05:55 +0000
Message-ID: <41f715ce-5597-b66a-e708-26d102668cf5@csgroup.eu>
References: <20211227145903.187152-1-wangkefeng.wang@huawei.com>
 <20211227145903.187152-3-wangkefeng.wang@huawei.com>
In-Reply-To: <20211227145903.187152-3-wangkefeng.wang@huawei.com>
Accept-Language: fr-FR, en-US
Content-Language: en-US
user-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101
 Thunderbird/91.4.0
x-ms-exchange-antispam-messagedata-chunkcount: 1
x-ms-exchange-antispam-messagedata-0: =?utf-8?B?VHpVUjYxdnZ5TktURGRsT1JiTWJIOUppVSttSldIcUJDYWlhZDAvM2RBODYv?=
 =?utf-8?B?Qmo0dllieG9DeGlqS2l5M2FleHQzTlAwUlBaQUY2QnZKYytuSGRXUjh2cXZD?=
 =?utf-8?B?NVlwMGJLTFNaRXlRVnEzSlkvNEN5NUhMWnBDRnEwc0tvYWNVS1RZOUxHUzBh?=
 =?utf-8?B?RGNFeUJqL0JuSXNzNXJ2WmpQTHpQQVRlOGhjemU4MmtOdVJOOVpFQmZnT3VV?=
 =?utf-8?B?MnFUZVNycTBLQm9PNXJZUERTVWFGczdWTEppZHRlWlo4QWdmOXRUelplOCsv?=
 =?utf-8?B?YldLZVRXVW95aGxFNVJrTEY5VWVhRHB3ZTdQZmZnYWxod2VGT08vN3ZQQUUw?=
 =?utf-8?B?ZHI4V0dMM2VNSk9EbS9PMkJCWnJtRjhmdHF1Q3ZCUzhmYUFrakRpcERockhI?=
 =?utf-8?B?WXdwUmcvank0SWYzeER6TDY1cTU1Yld5Z0NzaVJ5REpkaGpLNDAwYnRGS0hS?=
 =?utf-8?B?My8ydzdidVRhWC9SUmtCS2Q0SWo5SklPSnExTnlzSzF5Tll1cGs5TEdGRi9R?=
 =?utf-8?B?QytmbHNRSk1ybHhCUGRnUmQzL3g5dzdNcFZHYmZoWUNKbGRWVVJQaUlVYlRC?=
 =?utf-8?B?R3BuWnhLaUJ6NDd6VE4wZTc5OVFvRFBmQlRSSTV2Y2NvTTBtczhCY0tzN2NY?=
 =?utf-8?B?Q1hNNnY1VXRmWFd2UVNTdEhVREdFRkdnaUtCUnJGdnV5c2hFRkhnN3dPditW?=
 =?utf-8?B?RmlqQVBZVk1wbm9CaGlGZXpnQUlIMktMZ3hwNzVFbjIrR01LV00yUWR3TTAy?=
 =?utf-8?B?Z3gxQzFuS2RFUTVBczJOT2FVdEQwY2hyOUhVcFB0RzZValhYYkhJWEpYTFQv?=
 =?utf-8?B?V2VNNHFDUWQ0Nld2SmxsZHZtZFRoMkNwUkNsWmlFSFJmZ0lySnkrS0dXU3lz?=
 =?utf-8?B?em5IeDdkNzNkdFA5Y3Zaa2tzL3VVMk1vTGg2OEhtUm9zWW4xTUx6N0wvaDBN?=
 =?utf-8?B?Q0RLNHRnQTk2MXk2ZW0yOThhTXRWSUFWSGxjVjNjTmpSTW9aRjN3a0xtK0ZT?=
 =?utf-8?B?RVM2bW8rcjRuQ3gyTDNnTFN2RCsySSsvYXRoNzZkZGg0RmMwRzlNL09jT1ha?=
 =?utf-8?B?b1A3bSt4VWxiaGNaOC84R09ucFV5aFhCVStrUXlNVWhCVGRTQUtNcG5lRFFm?=
 =?utf-8?B?bXZDM0VMaFhOaGNjaFhzS0RqcWJQeUpzVW14bnVnZVM1M1dXQkMwTzYvdXNB?=
 =?utf-8?B?U3FseGdnc2xQN2JwcVM2OTlJQkJqQjBaNHd6Wjdac2Ywd2xEOWtObU51YjdE?=
 =?utf-8?B?bGM0bWJ0UERWa2toNU11OUluVWd4MHJreTNoYkl0MjBDd09XMWtVTlVoSjlZ?=
 =?utf-8?B?QytZcnpoT29mWVVtZEM4NVBGMzRFQ1JyVGd4SkdFeVdBZUdJWHdZMEx4bmo2?=
 =?utf-8?B?bTJkQXU3K3dJQ21tcXVOWm5uVTZCV1l2dnZXYi80S3J5V29jQXEyTkRJd0Nh?=
 =?utf-8?B?ZkcxZ0NzWnFZbFpKWmwvSDRZcEFvTTQ1b2dtZGd5MVE1Rm42UGsrSytZSWU1?=
 =?utf-8?B?bERyVzFkaUZ2TExLdTNGT0JVYjBGTlpNWjdPTHpYZWsvTFVFSWZkMHdFNnVw?=
 =?utf-8?B?NmVaa3oxWm9JdnM2TjJYYUgrZzg3MWNrTVBhblhRRE9ndGNXMnFFaTZHZW1s?=
 =?utf-8?B?cEd5ZlJvaGx1RjVnZHdMNy9LOG9yd0cxakFHaEVwY05kdk1XcXZIMVRnb25H?=
 =?utf-8?B?dXlaU1B1MmN4eFhNMVFHSXlvUmVjU2R3NitUVlZudjZYY011aVdXREZ2RXVY?=
 =?utf-8?B?azY0SzJ2MlFpUlVrSE1YaVVMb1BQRnhBSEs0UTdpSngyd1dQYTREWjgyb25Y?=
 =?utf-8?B?S3JnblFxVDNLeVhrKzQ1WWZ3U2RSQzVtS0h2SnNRY3lGUUV0b2NXSGtqbklx?=
 =?utf-8?B?VnhxeFR1R0FQTHBYNVA0WGJlbU1ESHU2bnBWRUJvN3lEblkzeGFaMDdDb3FQ?=
 =?utf-8?B?Zk9vdFU4WXUrK1NuTlppano4cXlkc0g2cFZFV3BLNEVGbDVyZUN0b1kwVWVj?=
 =?utf-8?B?enR6LzRQcGlFMldzdEZaMEFCZktnVmhMMjBKRGM5dkRoNWVmbUtVVjkrempX?=
 =?utf-8?B?NGsvTVZLd1Q5VHlyaVF0RklJWjlqOFo4b0ppbStQcitsQnA2Y0hRSTNialRQ?=
 =?utf-8?B?dHg1RXo1S3hYMkFKNGQvUGN5OVpQYW1MN3lSQ1ErMC9ub214bjlDQ3phclJ5?=
 =?utf-8?B?Tnh2R3lxTHpsY3ZKOFZ2ZmU5YTRrbmJTS3F3NlgyMW5RYjF1NjFqb2lJV1JK?=
 =?utf-8?Q?MPw2riScYMFQixnsNOZIAAPGyxXltSoTUKyu9clO1A=3D?=
Content-Type: text/plain; charset="utf-8"
Content-ID: <3E31213F41AEA4438CCDA4F0600EE95C@FRAP264.PROD.OUTLOOK.COM>
Content-Transfer-Encoding: base64
MIME-Version: 1.0
X-OriginatorOrg: csgroup.eu
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-AuthSource: MR1P264MB2980.FRAP264.PROD.OUTLOOK.COM
X-MS-Exchange-CrossTenant-Network-Message-Id: 2e88415b-26b8-42dc-009f-08d9d80e9ead
X-MS-Exchange-CrossTenant-originalarrivaltime: 15 Jan 2022 10:05:55.1631
 (UTC)
X-MS-Exchange-CrossTenant-fromentityheader: Hosted
X-MS-Exchange-CrossTenant-id: 9914def7-b676-4fda-8815-5d49fb3b45c8
X-MS-Exchange-CrossTenant-mailboxtype: HOSTED
X-MS-Exchange-CrossTenant-userprincipalname: 3/9LBusWJxfE71nzpP6hbqTImmq5u0/MyzkOzM15mREEmBWu1mMu41LY6R6DbXejA+vnxejCIxk6p7YCKKke1QwzIUS4HMMfNJwmUaVFtpk=
X-MS-Exchange-Transport-CrossTenantHeadersStamped: MRXP264MB0263
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
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