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[209.85.208.173]) by smtp.gmail.com with ESMTPSA id d24sm1948886lfn.140.2020.09.20.10.43.11 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 20 Sep 2020 10:43:12 -0700 (PDT) Received: by mail-lj1-f173.google.com with SMTP id a15so9203220ljk.2 for ; Sun, 20 Sep 2020 10:43:11 -0700 (PDT) X-Received: by 2002:a2e:84d6:: with SMTP id q22mr13708479ljh.70.1600623791519; Sun, 20 Sep 2020 10:43:11 -0700 (PDT) MIME-Version: 1.0 References: <20200919091751.011116649@linutronix.de> <87mu1lc5mp.fsf@nanos.tec.linutronix.de> <87k0wode9a.fsf@nanos.tec.linutronix.de> <87eemwcpnq.fsf@nanos.tec.linutronix.de> In-Reply-To: <87eemwcpnq.fsf@nanos.tec.linutronix.de> From: Linus Torvalds Date: Sun, 20 Sep 2020 10:42:55 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [patch RFC 00/15] mm/highmem: Provide a preemptible variant of kmap_atomic & friends To: Thomas Gleixner Cc: LKML , linux-arch , Paul McKenney , "the arch/x86 maintainers" , Sebastian Andrzej Siewior , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Will Deacon , Andrew Morton , Linux-MM , Russell King , Linux ARM , Chris Zankel , Max Filippov , linux-xtensa@linux-xtensa.org, Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , David Airlie , Daniel Vetter , intel-gfx , dri-devel , Ard Biesheuvel , Herbert Xu , Vineet Gupta , "open list:SYNOPSYS ARC ARCHITECTURE" , Arnd Bergmann , Guo Ren , linux-csky@vger.kernel.org, Michal Simek , Thomas Bogendoerfer , linux-mips@vger.kernel.org, Nick Hu , Greentime Hu , Vincent Chen , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , linuxppc-dev , "David S. Miller" , linux-sparc Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Sep 20, 2020 at 10:40 AM Thomas Gleixner wrote: > > I think the more obvious solution is to split the whole exercise: > > schedule() > prepare_switch() > unmap() > > switch_to() > > finish_switch() > map() Yeah, that looks much easier to explain. Ack. Linus