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Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1r0lDg-00DbhO-1v; Wed, 08 Nov 2023 16:15:56 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 4485030049D; Wed, 8 Nov 2023 17:15:56 +0100 (CET) Date: Wed, 8 Nov 2023 17:15:56 +0100 From: Peter Zijlstra To: Thomas Gleixner Cc: Ankur Arora , linux-kernel@vger.kernel.org, torvalds@linux-foundation.org, paulmck@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, willy@infradead.org, mgorman@suse.de, 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, mingo@kernel.org, bristot@kernel.org, mathieu.desnoyers@efficios.com, geert@linux-m68k.org, glaubitz@physik.fu-berlin.de, anton.ivanov@cambridgegreys.com, mattst88@gmail.com, krypton@ulrich-teichert.org, rostedt@goodmis.org, David.Laight@aculab.com, richard@nod.at, mjguzik@gmail.com Subject: Re: [RFC PATCH 00/86] Make the kernel preemptible Message-ID: <20231108161556.GL3818@noisy.programming.kicks-ass.net> References: <20231107215742.363031-1-ankur.a.arora@oracle.com> <20231108085156.GD8262@noisy.programming.kicks-ass.net> <87bkc4lfxp.fsf@oracle.com> <20231108101330.GK3818@noisy.programming.kicks-ass.net> <877cmsgsrg.ffs@tglx> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <877cmsgsrg.ffs@tglx> X-Stat-Signature: 5zgz48rooudbukqwo685dd1j98u8agy3 X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 7620B1C0005 X-Rspam-User: X-HE-Tag: 1699460188-45061 X-HE-Meta: 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 4VYjlQX/ vkIlFJlu9Wf6cZ8xRmAHhyWj0ALVMrglbDXx9bddDMXLisNeZIDooRmtmacG2R1Gi4X17TMg0ui+nqBcJZ9y+d+MF6UrC2xI0xdFX7u6mV2ynPrYtQX1kT8+DxPUHFBdjCmUX6v/329uy25E= 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: List-Subscribe: List-Unsubscribe: On Wed, Nov 08, 2023 at 04:38:11PM +0100, Thomas Gleixner wrote: > No. The whole point of LAZY is to keep preempt_schedule(), > preempt_schedule_notrace(), irqentry_exit_cond_resched() always enabled. Yeah, I got that. What wasn't at all clear is that it also wanted to replace NONE. 0/n didn't even mention none.