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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; 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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-Spam-Flag: NO 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-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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