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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 66677C761A6 for ; Tue, 4 Apr 2023 09:38:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234289AbjDDJip (ORCPT ); Tue, 4 Apr 2023 05:38:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39002 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234248AbjDDJiW (ORCPT ); Tue, 4 Apr 2023 05:38:22 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ABA8019BC for ; Tue, 4 Apr 2023 02:38:21 -0700 (PDT) From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1680601099; 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=0DN55bSNTQFajH9UQ/ZPWNclui6hp3/dzUXrzibB4e8=; b=nLmjDCn+I8gKh1U6nup+PQOxkEIwwA5YaBFi6iv6Gi5SbuROVA4VgAny39IDeH9hZ1JIQ8 EyXyXzpJpX/zbwOacFeMw7mwuu5JzGhbiF3b6RR9Z84ox2bKX4mQ8A3vzrtXzfGBaS3iLF Cs8jqOSO0AAzGHfLGrTEQfh8pWo3hIS+DryuDfi/hymJ+UPWBQ1C6mtyxd2UBUCOTDg6+e C+nyAZjsFz4+vfmpD2nmBOxt79GsU5KmChWDSMiVHGibjjjmDI2eUGR/Wp1lR12f4VYvxg heyez4urTQwcjMyfhUU6StPikyikmalcdrZoy6u3pWJ2urIt1PlpN7vCr6U8ow== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1680601099; 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=0DN55bSNTQFajH9UQ/ZPWNclui6hp3/dzUXrzibB4e8=; b=mNm+u/MFMwBwZ9t9EQ2Tsp/yvJ1Qa/SQNUQVXZL4K1u6JA/OW/xTAlSZ/ut0IGMFqy/BPV fQl1nyKmy3SgrbBQ== To: Ankur Arora , linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org Cc: torvalds@linux-foundation.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, willy@infradead.org, mgorman@suse.de, peterz@infradead.org, rostedt@goodmis.org, vincent.guittot@linaro.org, jon.grimm@amd.com, bharata@amd.com, boris.ostrovsky@oracle.com, konrad.wilk@oracle.com, ankur.a.arora@oracle.com Subject: Re: [PATCH 8/9] irqentry: define irqentry_exit_allow_resched() In-Reply-To: <20230403052233.1880567-9-ankur.a.arora@oracle.com> References: <20230403052233.1880567-1-ankur.a.arora@oracle.com> <20230403052233.1880567-9-ankur.a.arora@oracle.com> Date: Tue, 04 Apr 2023 11:38:18 +0200 Message-ID: <87pm8kq96d.ffs@tglx> MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Apr 02 2023 at 22:22, Ankur Arora wrote: > Allow threads marked TIF_ALLOW_RESCHED to be rescheduled in irqexit. > > This is only necessary under !preempt_model_preemptible() for which > we reuse the same logic as irqentry_exit_code_resched(). This tells what this patch is doing but completely fails to explain why this is necessary and useful. Thanks, tglx