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bh=Cz3ybOd/ypkcGDuMCJQdl0UFouGTxpARZATHk1efhH0=; b=EGx2EBigs6+KVxSISL/lO4SeWI2/p5U3N6zV5areodcDyVNQT2YbEaxonhjEzXP7/szlID TMqjKMwwRJVKmQfn51MUW9KIbWl9E19kzugQpYPh1RqXMdMqyHRHId8GsHbiYMY1gupCr9 inWCgekLEVw9LLIxUEhX+SjOdAKmXLyfbATOE5SKrIhGQ6opMrTgQNDBWj6h+pupcy9mQY IAtJFpC+IZrsZhADhx21jPYjN4cUEmbdknYpq1yaFpD3q1JUKeyYvZEasHaRFyuKPfCocG sb/JjJcoHFqbdHPNLrqct85JyOKGX/90xcldUD95gAEiF72EcQ3euVx2thUmyg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1695198386; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Cz3ybOd/ypkcGDuMCJQdl0UFouGTxpARZATHk1efhH0=; b=Zhs312twDc9TbsbkF5GT2tuvKzW8ClBRyZtMimieaTdcJbOGBK7CVUU6mFwCowxAhHysBo 5AdimDwJAjJms3Ag== To: Linus Torvalds , John Paul Adrian Glaubitz Cc: Peter Zijlstra , Matthew Wilcox , Ankur Arora , linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, akpm@linux-foundation.org, luto@kernel.org, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, mingo@redhat.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, mgorman@suse.de, rostedt@goodmis.org, jon.grimm@amd.com, bharata@amd.com, raghavendra.kt@amd.com, boris.ostrovsky@oracle.com, konrad.wilk@oracle.com, jgross@suse.com, andrew.cooper3@citrix.com, Geert Uytterhoeven , linux-m68k@lists.linux-m68k.org, Richard Weinberger , Anton Ivanov , Johannes Berg , linux-um@lists.infradead.org, Brian Cain , linux-hexagon@vger.kernel.org, Richard Henderson , Ivan Kokshaysky , Matt Turner , linux-alpha@vger.kernel.org Subject: Re: Arches that don't support PREEMPT In-Reply-To: References: <87zg1u1h5t.fsf@oracle.com> <20230911150410.GC9098@noisy.programming.kicks-ass.net> <87h6o01w1a.fsf@oracle.com> <20230912082606.GB35261@noisy.programming.kicks-ass.net> <87cyyfxd4k.ffs@tglx> <87led2wdj0.ffs@tglx> <0e69f7df80dc5878071deb0d80938138d19de1d1.camel@physik.fu-berlin.de> <20230919134218.GA39281@noisy.programming.kicks-ass.net> Date: Wed, 20 Sep 2023 10:26:25 +0200 Message-ID: <87edituu6m.ffs@tglx> MIME-Version: 1.0 Content-Type: text/plain X-Rspam-User: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: BE1C8A003D X-Stat-Signature: incyo8n6et4y6aqdg6fibszddcpgq9dd X-HE-Tag: 1695198388-556990 X-HE-Meta: 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 YW8ceM22 JORsQ0tQN1gvNIQa80aqE8NI84ZQAYSan/vYJKaasrAYkqoI= 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 Tue, Sep 19 2023 at 10:25, Linus Torvalds wrote: > PeterZ mentioned the generic entry code, which does this for the entry > path. But it actually goes much deeper: just do a > > git grep preempt_disable arch/x86/kernel > > and then do the same for some other architectures. > > Looking at alpha, for example, there *are* hits for it, so at least > some of the code there clearly *tries* to do it. But does it cover all > the required parts? If it's never been tested, I'd be surprised if > it's all just ready to go. Interestingly enough m68k has zero instances, but it supports PREEMPT on the COLDFIRE subarchitecture...