From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 207E2C3F2D2 for ; Mon, 2 Mar 2020 11:20:35 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id BF7E920842 for ; Mon, 2 Mar 2020 11:20:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=gmx.net header.i=@gmx.net header.b="hTNTiGkP" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BF7E920842 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=gmx.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 4AD3B6B0007; Mon, 2 Mar 2020 06:20:34 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 45F0C6B0008; Mon, 2 Mar 2020 06:20:34 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 3269A6B000A; Mon, 2 Mar 2020 06:20:34 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0180.hostedemail.com [216.40.44.180]) by kanga.kvack.org (Postfix) with ESMTP id 1AB926B0007 for ; Mon, 2 Mar 2020 06:20:34 -0500 (EST) Received: from smtpin01.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 079678248076 for ; Mon, 2 Mar 2020 11:20:34 +0000 (UTC) X-FDA: 76550179188.01.soup03_4d2da0e0473d X-HE-Tag: soup03_4d2da0e0473d X-Filterd-Recvd-Size: 9917 Received: from mout.gmx.net (mout.gmx.net [212.227.17.21]) by imf03.hostedemail.com (Postfix) with ESMTP for ; Mon, 2 Mar 2020 11:20:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1583147984; bh=W0AEuRxwaNTM1wIbdflqt1mDaAQNU2XGAUPwGpFwfWw=; h=X-UI-Sender-Class:Subject:To:Cc:References:From:Date:In-Reply-To; b=hTNTiGkPrHFpfzTv92CxoDj+m/u7w8wulahh2YNUZ3ilgCKTOf7jYgAY8yD9Ao4qv SytwzZHwpUWQzFzBhJtl2DIhQoCUV/ToAeRl5zIDJgbyNck2JHuucSsXxomLmXYLp/ +Dei76MRo/TXrQDxaEk4FvqRCIn9xEsmVcXYatHg= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from [10.20.71.51] ([193.16.224.3]) by mail.gmx.com (mrgmx105 [212.227.17.168]) with ESMTPSA (Nemesis) id 1MOREc-1ijv5y1FTa-00PwQk; Mon, 02 Mar 2020 12:19:44 +0100 Subject: Re: [PATCH] mm/special: Create generic fallbacks for pte_special() and pte_mkspecial() To: Anshuman Khandual , linux-mm@kvack.org Cc: Richard Henderson , Ivan Kokshaysky , Matt Turner , Russell King , Guo Ren , Brian Cain , Tony Luck , Fenghua Yu , Geert Uytterhoeven , Sam Creasey , Michal Simek , Ralf Baechle , Paul Burton , Nick Hu , Greentime Hu , Vincent Chen , Ley Foon Tan , Jonas Bonn , Stefan Kristiansson , Stafford Horne , "James E.J. Bottomley" , "David S. Miller" , Jeff Dike , Richard Weinberger , Anton Ivanov , Guan Xuetao , Chris Zankel , Max Filippov , Andrew Morton , linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, nios2-dev@lists.rocketboards.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org References: <1583114190-7678-1-git-send-email-anshuman.khandual@arm.com> From: Helge Deller Autocrypt: addr=deller@gmx.de; keydata= mQINBF3Ia3MBEAD3nmWzMgQByYAWnb9cNqspnkb2GLVKzhoH2QD4eRpyDLA/3smlClbeKkWT HLnjgkbPFDmcmCz5V0Wv1mKYRClAHPCIBIJgyICqqUZo2qGmKstUx3pFAiztlXBANpRECgwJ r+8w6mkccOM9GhoPU0vMaD/UVJcJQzvrxVHO8EHS36aUkjKd6cOpdVbCt3qx8cEhCmaFEO6u CL+k5AZQoABbFQEBocZE1/lSYzaHkcHrjn4cQjc3CffXnUVYwlo8EYOtAHgMDC39s9a7S90L 69l6G73lYBD/Br5lnDPlG6dKfGFZZpQ1h8/x+Qz366Ojfq9MuuRJg7ZQpe6foiOtqwKym/zV dVvSdOOc5sHSpfwu5+BVAAyBd6hw4NddlAQUjHSRs3zJ9OfrEx2d3mIfXZ7+pMhZ7qX0Axlq Lq+B5cfLpzkPAgKn11tfXFxP+hcPHIts0bnDz4EEp+HraW+oRCH2m57Y9zhcJTOJaLw4YpTY GRUlF076vZ2Hz/xMEvIJddRGId7UXZgH9a32NDf+BUjWEZvFt1wFSW1r7zb7oGCwZMy2LI/G aHQv/N0NeFMd28z+deyxd0k1CGefHJuJcOJDVtcE1rGQ43aDhWSpXvXKDj42vFD2We6uIo9D 1VNre2+uAxFzqqf026H6cH8hin9Vnx7p3uq3Dka/Y/qmRFnKVQARAQABtBxIZWxnZSBEZWxs ZXIgPGRlbGxlckBnbXguZGU+iQJRBBMBCAA7AhsDBQsJCAcCBhUKCQgLAgQWAgMBAh4BAheA FiEERUSCKCzZENvvPSX4Pl89BKeiRgMFAl3J1zsCGQEACgkQPl89BKeiRgNK7xAAg6kJTPje uBm9PJTUxXaoaLJFXbYdSPfXhqX/BI9Xi2VzhwC2nSmizdFbeobQBTtRIz5LPhjk95t11q0s uP5htzNISPpwxiYZGKrNnXfcPlziI2bUtlz4ke34cLK6MIl1kbS0/kJBxhiXyvyTWk2JmkMi REjR84lCMAoJd1OM9XGFOg94BT5aLlEKFcld9qj7B4UFpma8RbRUpUWdo0omAEgrnhaKJwV8 qt0ULaF/kyP5qbI8iA2PAvIjq73dA4LNKdMFPG7Rw8yITQ1Vi0DlDgDT2RLvKxEQC0o3C6O4 iQq7qamsThLK0JSDRdLDnq6Phv+Yahd7sDMYuk3gIdoyczRkXzncWAYq7XTWl7nZYBVXG1D8 gkdclsnHzEKpTQIzn/rGyZshsjL4pxVUIpw/vdfx8oNRLKj7iduf11g2kFP71e9v2PP94ik3 Xi9oszP+fP770J0B8QM8w745BrcQm41SsILjArK+5mMHrYhM4ZFN7aipK3UXDNs3vjN+t0zi qErzlrxXtsX4J6nqjs/mF9frVkpv7OTAzj7pjFHv0Bu8pRm4AyW6Y5/H6jOup6nkJdP/AFDu 5ImdlA0jhr3iLk9s9WnjBUHyMYu+HD7qR3yhX6uWxg2oB2FWVMRLXbPEt2hRGq09rVQS7DBy dbZgPwou7pD8MTfQhGmDJFKm2ju5Ag0EXchrcwEQAOsDQjdtPeaRt8EP2pc8tG+g9eiiX9Sh rX87SLSeKF6uHpEJ3VbhafIU6A7hy7RcIJnQz0hEUdXjH774B8YD3JKnAtfAyuIU2/rOGa/v UN4BY6U6TVIOv9piVQByBthGQh4YHhePSKtPzK9Pv/6rd8H3IWnJK/dXiUDQllkedrENXrZp eLUjhyp94ooo9XqRl44YqlsrSUh+BzW7wqwfmu26UjmAzIZYVCPCq5IjD96QrhLf6naY6En3 ++tqCAWPkqKvWfRdXPOz4GK08uhcBp3jZHTVkcbo5qahVpv8Y8mzOvSIAxnIjb+cklVxjyY9 dVlrhfKiK5L+zA2fWUreVBqLs1SjfHm5OGuQ2qqzVcMYJGH/uisJn22VXB1c48yYyGv2HUN5 lC1JHQUV9734I5cczA2Gfo27nTHy3zANj4hy+s/q1adzvn7hMokU7OehwKrNXafFfwWVK3OG 1dSjWtgIv5KJi1XZk5TV6JlPZSqj4D8pUwIx3KSp0cD7xTEZATRfc47Yc+cyKcXG034tNEAc xZNTR1kMi9njdxc1wzM9T6pspTtA0vuD3ee94Dg+nDrH1As24uwfFLguiILPzpl0kLaPYYgB wumlL2nGcB6RVRRFMiAS5uOTEk+sJ/tRiQwO3K8vmaECaNJRfJC7weH+jww1Dzo0f1TP6rUa fTBRABEBAAGJAjYEGAEIACAWIQRFRIIoLNkQ2+89Jfg+Xz0Ep6JGAwUCXchrcwIbDAAKCRA+ Xz0Ep6JGAxtdEAC54NQMBwjUNqBNCMsh6WrwQwbg9tkJw718QHPw43gKFSxFIYzdBzD/YMPH l+2fFiefvmI4uNDjlyCITGSM+T6b8cA7YAKvZhzJyJSS7pRzsIKGjhk7zADL1+PJei9p9idy RbmFKo0dAL+ac0t/EZULHGPuIiavWLgwYLVoUEBwz86ZtEtVmDmEsj8ryWw75ZIarNDhV74s BdM2ffUJk3+vWe25BPcJiaZkTuFt+xt2CdbvpZv3IPrEkp9GAKof2hHdFCRKMtgxBo8Kao6p Ws/Vv68FusAi94ySuZT3fp1xGWWf5+1jX4ylC//w0Rj85QihTpA2MylORUNFvH0MRJx4mlFk XN6G+5jIIJhG46LUucQ28+VyEDNcGL3tarnkw8ngEhAbnvMJ2RTx8vGh7PssKaGzAUmNNZiG MB4mPKqvDZ02j1wp7vthQcOEg08z1+XHXb8ZZKST7yTVa5P89JymGE8CBGdQaAXnqYK3/yWf FwRDcGV6nxanxZGKEkSHHOm8jHwvQWvPP73pvuPBEPtKGLzbgd7OOcGZWtq2hNC6cRtsRdDx 4TAGMCz4j238m+2mdbdhRh3iBnWT5yPFfnv/2IjFAk+sdix1Mrr+LIDF++kiekeq0yUpDdc4 ExBy2xf6dd+tuFFBp3/VDN4U0UfG4QJ2fg19zE5Z8dS4jGIbLrgzBF3IbakWCSsGAQQB2kcP AQEHQNdEF2C6q5MwiI+3akqcRJWo5mN24V3vb3guRJHo8xbFiQKtBBgBCAAgFiEERUSCKCzZ ENvvPSX4Pl89BKeiRgMFAl3IbakCGwIAgQkQPl89BKeiRgN2IAQZFggAHRYhBLzpEj4a0p8H wEm73vcStRCiOg9fBQJdyG2pAAoJEPcStRCiOg9fto8A/3cti96iIyCLswnSntdzdYl72SjJ HnsUYypLPeKEXwCqAQDB69QCjXHPmQ/340v6jONRMH6eLuGOdIBx8D+oBp8+BGLiD/9qu5H/ eGe0rrmE5lLFRlnm5QqKKi4gKt2WHMEdGi7fXggOTZbuKJA9+DzPxcf9ShuQMJRQDkgzv/VD V1fvOdaIMlM1EjMxIS2fyyI+9KZD7WwFYK3VIOsC7PtjOLYHSr7o7vDHNqTle7JYGEPlxuE6 hjMU7Ew2Ni4SBio8PILVXE+dL/BELp5JzOcMPnOnVsQtNbllIYvXRyX0qkTD6XM2Jbh+xI9P xajC+ojJ/cqPYBEALVfgdh6MbA8rx3EOCYj/n8cZ/xfo+wR/zSQ+m9wIhjxI4XfbNz8oGECm xeg1uqcyxfHx+N/pdg5Rvw9g+rtlfmTCj8JhNksNr0NcsNXTkaOy++4Wb9lKDAUcRma7TgMk Yq21O5RINec5Jo3xeEUfApVwbueBWCtq4bljeXG93iOWMk4cYqsRVsWsDxsplHQfh5xHk2Zf GAUYbm/rX36cdDBbaX2+rgvcHDTx9fOXozugEqFQv9oNg3UnXDWyEeiDLTC/0Gei/Jd/YL1p XzCscCr+pggvqX7kI33AQsxo1DT19sNYLU5dJ5Qxz1+zdNkB9kK9CcTVFXMYehKueBkk5MaU ou0ZH9LCDjtnOKxPuUWstxTXWzsinSpLDIpkP//4fN6asmPo2cSXMXE0iA5WsWAXcK8uZ4jD c2TFWAS8k6RLkk41ZUU8ENX8+qZx/Q== Message-ID: Date: Mon, 2 Mar 2020 12:19:28 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: <1583114190-7678-1-git-send-email-anshuman.khandual@arm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:f+ApG8Jvu59vazNgfxUkIj2cuvWszDcxfXbYPk/EcZDTaWVlxCo 7wV7zMdsUJ/8jZFhXwC3GlnyQOZgVfZ0Tqc6R4FGesB2+nbn2jBLiCx5ZMoN/mqbMry/kf9 eyq62oCq0ky/yyNMdBr8GbYpjzbMZG4HJTkzpTwkQJhDroJxo7BbG6rHO3p5L2XUNdF3zq2 93reBzFf1arlhD1Za6wTQ== X-UI-Out-Filterresults: notjunk:1;V03:K0:Q6U3Fl2yf6I=:XplsiSzKDGRlRZREeUVR5F q1u66Nwa+m17Ni84QTHrQfqh1MPBgds2Rq0St0rvtAM17I0nwJMTA1QhWnVCv1kMXp64gj3je n/qveNqtU4I12FpRGWzlhqv8Bb8QB9zsIIjxIsdTaY9LiPUzoE/XhR5W8HieBXkw4Gdx/BRK/ FQtJhoQ+dFfxnqMHsqqORcW5nO01y/uX97DlRWFqslh5ZLIvXgVq5pgr5yhbJBBvpZRJFVPtN 6tKQqh3H1WVRUGGgSFZY/dqkyMUoQdGAo2q93krCQTvrQgPHIBRXToUpnyc9V/k6j2/t9xmYC KwGhZJqZtDuyPb8WK0vtIuBWmZYZ2qUbjtNvtmDYcGRoOncW9aas9w8t9v0VhY4ZXPGj/kYmX V7AQYz0MlYRhZkeCZPOLyvyEdQ+FzAl+8v9B9iEgY9dorqE6xVO4bXx2vS+QZKfc3oFkbx+gA n6HybcbWcWBAdak0fQfrxPRv+vk2X9lUpxqh0ezq8wAtPV9GRQFIekxdAyLIIq1dgV5Yl+B9r dWiZow6ypNbsNXhKyaxMBCcIl4YoUy0X4lAEEv5WK9txC5BjSrXaMIWBIfpZ/dTqaURXE8f1m 0FwiDxUPcJAoaLLcxjQjSXE27gyc1Z9cOJG3EyQjapmxQGIKDdg9A1fxpx8t2C/5946ohyIr4 g2UIQKAQ4OB9tpSFioq10E8kfFp+OW9O6pVvCKnWVzLyh00/MBZIQn1PtJyRPFeWkjhmpWXQ5 +kfSu+T2sdyc0JdTmz6qLQTpWgN2fDWWy6MAVAyPyfMbqp7b41tM5C2t5HZ79VoddHpzXEEpl PXGWFG9CuGcMBJmtW9IZKwFutXmiUNlOv5v85nfBPd9J4s8uXbE8mIm+65DIYO5/uj44QyZpC +OCIp2JdRtyHavuV8KKclvTFNQgS9Zss+JjpRovuWAtL1Hb/IS/K6qN9DUyIzKSefQ04cUv5x E2uHeFHW+Tz9Qe431t3AcpC7c/z6mhFnz/fIclEX3gJwYXahGjeapukHejVaYlhNwScnDAAVF onQ6IIQq5GMgaH93iAjkiGBipaimgAa1DZ0IbFxy7qaKC8sG78LNuOlbNchq3W73LSpOm6PyA YW7Il+1s6SFWH43UabDkvk2L3d0jC+C3YQN3g+408NwCrXBRG+sFPn1LxcJhZM6VJXeiH/LS0 wO/2Y+Gbr+HFauHL92ZFf9/jnakPUIU8ZXPL2Uy7iz5DK1tYYcFPUv+ftyvVOomXH+YIDiy2O jfcobYAwoNCLoQj25 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 02.03.20 02:56, Anshuman Khandual wrote: > Currently there are many platforms that dont enable HAVE_ARCH_PTE_SPECIA= L > but required to define quite similar fallback stubs for special page tab= le > entry helpers such as pte_special() and pte_mkspecial(), as they get bui= ld > in generic MM without a config check. This creates two generic fallback > stub definitions for these helpers, eliminating much code duplication. > > mips platform has a special case where pte_special() and pte_mkspecial() > visibility is wider than what HAVE_ARCH_PTE_SPECIAL enablement requires. > This restricts those symbol visibility in order to avoid redefinitions > which is now exposed through this new generic stubs and subsequent build > failure. arm platform set_pte_at() definition needs to be moved into a C > file just to prevent a build failure. > > Signed-off-by: Anshuman Khandual for parisc: Acked-by: Helge Deller # parisc Helge