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=-2.3 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no 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 3F2C4C432C2 for ; Tue, 24 Sep 2019 08:08:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F08EA2146E for ; Tue, 24 Sep 2019 08:08:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=web.de header.i=@web.de header.b="hEEPKBhi" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2438877AbfIXIIS (ORCPT ); Tue, 24 Sep 2019 04:08:18 -0400 Received: from mout.web.de ([212.227.15.4]:49247 "EHLO mout.web.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2436523AbfIXIIS (ORCPT ); Tue, 24 Sep 2019 04:08:18 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=web.de; s=dbaedf251592; t=1569312482; bh=5UUB7nBISPCMR8MLkZQo563E2CTK7plA3+JuTrsQPlU=; h=X-UI-Sender-Class:Subject:To:Cc:References:From:Date:In-Reply-To; b=hEEPKBhivbXBokJZPSixHFQyrwbGDoTQfOUMwaSxHAT+mm73WXm1wk+J0XjHaBXAR fqrJifb6ER1xWqCtVT/c3fxnMrRIIiXiGSno3JlXkqT+FBBRJYFxvjtTrVBz1jpaTx m7kYHgHNuH+TBbxdB1g+/DN4wjPrT5OCjPPvB9DQ= X-UI-Sender-Class: c548c8c5-30a9-4db5-a2e7-cb6cb037b8f9 Received: from [192.168.1.2] ([93.131.71.162]) by smtp.web.de (mrweb003 [213.165.67.108]) with ESMTPSA (Nemesis) id 0M6Dve-1hxcnA2BeE-00yDJX; Tue, 24 Sep 2019 10:08:02 +0200 Subject: Re: sched: make struct task_struct::state 32-bit To: Valentin Schneider , Alexey Dobriyan , dm-devel@redhat.com, linux-block@vger.kernel.org, rcu@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Andrea Arcangeli , Ingo Molnar , Jens Axboe , Peter Zijlstra , Julia Lawall References: <7e3e784c-e8e6-f9ba-490f-ec3bf956d96b@web.de> <0c4dcb91-4830-0013-b8c6-64b9e1ce47d4@arm.com> <32d65b15-1855-e7eb-e9c4-81560fab62ea@arm.com> From: Markus Elfring Autocrypt: addr=Markus.Elfring@web.de; prefer-encrypt=mutual; keydata= mQINBFg2+xABEADBJW2hoUoFXVFWTeKbqqif8VjszdMkriilx90WB5c0ddWQX14h6w5bT/A8 +v43YoGpDNyhgA0w9CEhuwfZrE91GocMtjLO67TAc2i2nxMc/FJRDI0OemO4VJ9RwID6ltwt mpVJgXGKkNJ1ey+QOXouzlErVvE2fRh+KXXN1Q7fSmTJlAW9XJYHS3BDHb0uRpymRSX3O+E2 lA87C7R8qAigPDZi6Z7UmwIA83ZMKXQ5stA0lhPyYgQcM7fh7V4ZYhnR0I5/qkUoxKpqaYLp YHBczVP+Zx/zHOM0KQphOMbU7X3c1pmMruoe6ti9uZzqZSLsF+NKXFEPBS665tQr66HJvZvY GMDlntZFAZ6xQvCC1r3MGoxEC1tuEa24vPCC9RZ9wk2sY5Csbva0WwYv3WKRZZBv8eIhGMxs rcpeGShRFyZ/0BYO53wZAPV1pEhGLLxd8eLN/nEWjJE0ejakPC1H/mt5F+yQBJAzz9JzbToU 5jKLu0SugNI18MspJut8AiA1M44CIWrNHXvWsQ+nnBKHDHHYZu7MoXlOmB32ndsfPthR3GSv jN7YD4Ad724H8fhRijmC1+RpuSce7w2JLj5cYj4MlccmNb8YUxsE8brY2WkXQYS8Ivse39MX BE66MQN0r5DQ6oqgoJ4gHIVBUv/ZwgcmUNS5gQkNCFA0dWXznQARAQABtCZNYXJrdXMgRWxm cmluZyA8TWFya3VzLkVsZnJpbmdAd2ViLmRlPokCVAQTAQgAPhYhBHDP0hzibeXjwQ/ITuU9 Figxg9azBQJYNvsQAhsjBQkJZgGABQsJCAcCBhUICQoLAgQWAgMBAh4BAheAAAoJEOU9Figx g9azcyMP/iVihZkZ4VyH3/wlV3nRiXvSreqg+pGPI3c8J6DjP9zvz7QHN35zWM++1yNek7Ar OVXwuKBo18ASlYzZPTFJZwQQdkZSV+atwIzG3US50ZZ4p7VyUuDuQQVVqFlaf6qZOkwHSnk+ CeGxlDz1POSHY17VbJG2CzPuqMfgBtqIU1dODFLpFq4oIAwEOG6fxRa59qbsTLXxyw+PzRaR LIjVOit28raM83Efk07JKow8URb4u1n7k9RGAcnsM5/WMLRbDYjWTx0lJ2WO9zYwPgRykhn2 sOyJVXk9xVESGTwEPbTtfHM+4x0n0gC6GzfTMvwvZ9G6xoM0S4/+lgbaaa9t5tT/PrsvJiob kfqDrPbmSwr2G5mHnSM9M7B+w8odjmQFOwAjfcxoVIHxC4Cl/GAAKsX3KNKTspCHR0Yag78w i8duH/eEd4tB8twcqCi3aCgWoIrhjNS0myusmuA89kAWFFW5z26qNCOefovCx8drdMXQfMYv g5lRk821ZCNBosfRUvcMXoY6lTwHLIDrEfkJQtjxfdTlWQdwr0mM5ye7vd83AManSQwutgpI q+wE8CNY2VN9xAlE7OhcmWXlnAw3MJLW863SXdGlnkA3N+U4BoKQSIToGuXARQ14IMNvfeKX NphLPpUUnUNdfxAHu/S3tPTc/E/oePbHo794dnEm57LuuQINBFg2+xABEADZg/T+4o5qj4cw nd0G5pFy7ACxk28mSrLuva9tyzqPgRZ2bdPiwNXJUvBg1es2u81urekeUvGvnERB/TKekp25 4wU3I2lEhIXj5NVdLc6eU5czZQs4YEZbu1U5iqhhZmKhlLrhLlZv2whLOXRlLwi4jAzXIZAu 76mT813jbczl2dwxFxcT8XRzk9+dwzNTdOg75683uinMgskiiul+dzd6sumdOhRZR7YBT+xC wzfykOgBKnzfFscMwKR0iuHNB+VdEnZw80XGZi4N1ku81DHxmo2HG3icg7CwO1ih2jx8ik0r riIyMhJrTXgR1hF6kQnX7p2mXe6K0s8tQFK0ZZmYpZuGYYsV05OvU8yqrRVL/GYvy4Xgplm3 DuMuC7/A9/BfmxZVEPAS1gW6QQ8vSO4zf60zREKoSNYeiv+tURM2KOEj8tCMZN3k3sNASfoG fMvTvOjT0yzMbJsI1jwLwy5uA2JVdSLoWzBD8awZ2X/eCU9YDZeGuWmxzIHvkuMj8FfX8cK/ 2m437UA877eqmcgiEy/3B7XeHUipOL83gjfq4ETzVmxVswkVvZvR6j2blQVr+MhCZPq83Ota xNB7QptPxJuNRZ49gtT6uQkyGI+2daXqkj/Mot5tKxNKtM1Vbr/3b+AEMA7qLz7QjhgGJcie qp4b0gELjY1Oe9dBAXMiDwARAQABiQI8BBgBCAAmFiEEcM/SHOJt5ePBD8hO5T0WKDGD1rMF Alg2+xACGwwFCQlmAYAACgkQ5T0WKDGD1rOYSw/+P6fYSZjTJDAl9XNfXRjRRyJSfaw6N1pA Ahuu0MIa3djFRuFCrAHUaaFZf5V2iW5xhGnrhDwE1Ksf7tlstSne/G0a+Ef7vhUyeTn6U/0m +/BrsCsBUXhqeNuraGUtaleatQijXfuemUwgB+mE3B0SobE601XLo6MYIhPh8MG32MKO5kOY hB5jzyor7WoN3ETVNQoGgMzPVWIRElwpcXr+yGoTLAOpG7nkAUBBj9n9TPpSdt/npfok9ZfL /Q+ranrxb2Cy4tvOPxeVfR58XveX85ICrW9VHPVq9sJf/a24bMm6+qEg1V/G7u/AM3fM8U2m tdrTqOrfxklZ7beppGKzC1/WLrcr072vrdiN0icyOHQlfWmaPv0pUnW3AwtiMYngT96BevfA qlwaymjPTvH+cTXScnbydfOQW8220JQwykUe+sHRZfAF5TS2YCkQvsyf7vIpSqo/ttDk4+xc Z/wsLiWTgKlih2QYULvW61XU+mWsK8+ZlYUrRMpkauN4CJ5yTpvp+Orcz5KixHQmc5tbkLWf x0n1QFc1xxJhbzN+r9djSGGN/5IBDfUqSANC8cWzHpWaHmSuU3JSAMB/N+yQjIad2ztTckZY pwT6oxng29LzZspTYUEzMz3wK2jQHw+U66qBFk8whA7B2uAU1QdGyPgahLYSOa4XAEGb6wbI FEE= Message-ID: Date: Tue, 24 Sep 2019 10:07:54 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.0 MIME-Version: 1.0 In-Reply-To: <32d65b15-1855-e7eb-e9c4-81560fab62ea@arm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:gdWTto7J1BLMzpuLsjXkxMpm9JPQANR6lT0+Gi8LVIYwwvcnmCB wbRC8Aq7YkXsjPF2BrDnR9s/c6qPEEeWSZK/1z0lz52lbZhqTmxMIlxXHOnRhiYfG5sQtoQ FwqPHD58FJBBWWLkgBF6+0ELov+JPZgWu/8tcNRcWkjWo+IVraNRuisxGf/B+KkFlahpWIz 8h+zWSyzIgQs9I7ijaaeg== X-UI-Out-Filterresults: notjunk:1;V03:K0:axxi6oXRmys=:x4mHB2rn9HIwxjm/+2t7zx F1NrtiZgELzy2ru7iCxdt4NWKcGpGGjPsVpGg8+16qutpm0DWxghSB/AXMPHdJBFv332Hh1Vb PT7SQ7NNJ+cIwPLJ5/SCW9E9keRAkmt1EyMCNy2gN91IKJFEswwEJ0MmC7+/cfjfCFsIEp6pJ FLKEG3th06O4BcFH8mqUF9Mk4vWFLAyKc4IAj9KPFUt52E88JzUorbGFyke7DxbVSNwlWGRmd 335yNlorr+YGfDVj0M7VGzOXfmdyK/rJYLlXc52IO7MSuwslC2MYJTko88PnGyQ+/+QfCyApC EntibQqhHBCyVM5ev/ZHr9rVu8zwj57bXWJ699bXDBgazEIswXQyyihh4mbJ4ecIVkoFl6zS/ cmxBNk4APQ06Nkwb0sN06cnrenzVEypb4td+1BnXd/fC93T0aJEqvSdc+khMwrsfS46p3iBh1 Dj/iHl0ASgnP7MZxzb3RukBHlJBf6p2O2kKB004Qj2B+0e1dGistXv+swgJ12UOJETuqvAm5l qPmCXhUb8nv7iEJcl2Q1sYYlegwEqaVo2Zp9r1fDY1TFN2OurCMZhS9mF/ifkxvL+2XjT4pkq jmIC43UcGojXxpC8CMkTJB5B35KhuI0zPlAI8WwIUHGGIou7SrQYfzRxpZJr5Q2rYWNd6LlS1 wtkwa2yF+Zab/WaSEEdbyG49wgbEzyfLNSPWscRO3DxAVNSSI5NUfgsV8+gf7FvTGFV7Sa70F Gb9yZFcwP8MbIsaC7DRzl5OCJ1vqXTurImDFjGp95IRRCW7Qp7Vnegr0rpBQU+FJSxm8ci/U1 AuG8PMOB6Gf6MZXYSAFURWupW33l69XI9GojX2CvRivO6UaD+tFtqRrQuVzFwFQ0Ok/zs1nuY ogEE5QDEKFNi+dWpAnx9GbB1/ThpKJnD7hOGMZCSTnrSYMxUkOnb98c78kYM+RuZWSt0+GgAo OpqtSr0JhRztyLJDymLPBkgF6xliV49tYmmc5M+Gv+favKnyfoTs4tEQlR79y/G6fSRHfMHFU KB1tngPzCRERXJi5gE/qlFIVq6PQdxebZZXRI+GHpuIECb8p3VI4kFiblW4qezbxEVS77nryq IzBd3+9e1OyF3NzrLITHCQ8g3zZCgCqD7XCvxGbTmEfHFB+aFVOnETsmB9L3rRk7kJS2spFvm nA1BDxjDD0G0bT53sK5dPzMc/2dAyNrR9YFqfCAKWIzVYKPGNcudBkVPMA2oBfj2TejziW80d hoed+CDCFa7ucCxSpJghlOwp/KfxX/t8n/+xfb924K9fDBc4oTMisWxIOUzs= Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org > // FIXME: current not recognized as task_struct*, fixhack with regexp > identifier current =3D~ "^current$"; Would you really like to use a regular expression for finding a single wor= d? > identifier state_var; > position pos; > @@ > > ( > p->state & state_var@pos > | > current->state & state_var@pos > | I see further opportunities to make such a SmPL disjunction more succinct. * ( ( \( p \| current \) ) -> state & state_var@pos | =E2=80=A6 * How do you think about to work with a SmPL constraint for a metavariable with the type =E2=80=9Cbinary operator=E2=80=9D? > set_current_state(state_var@pos) > | > set_special_state(state_var@pos) | \( set_current_state \| set_special_state \) (state_var@pos) > | > signal_pending_state(state_var@pos, p) > | > signal_pending_state(state_var@pos, current) | signal_pending_state(state_var@pos, \( p \| current \) ) Regards, Markus