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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=Xr5OdU09fchf7T6XXtW9sHUv92xJGMnI+LsTl9WurXQ=; b=r1wxlaOYpTZgnro3oSkgEtbe1K7xYORth4ylOQvm8TmQrTwkdjDGI4Yi9Ek2XN+S1C DWE982C5tzeroi29MIfQnVTTylHvVSzWeeM0YqfdWgF5QGfrc3OL345cDf0LN/oREEtw 8OPCuj5yTEhKnTN+Gwqwymntn/pXrLUCgUVGyIzgVqK5ddkUCe0Ad+Md8ytuVpZb9G0F mC2l7VOnftd/J8d9Ywn2Hu7uUqo+mKrBI+PHKgSOnS8H4O51bYNTQE5H7VkFNY4UA3i4 qRBU17+a+e3gXTM4m+biB9+2dntXiY0sLNwAXGyi203Bo0SlAP1xRA2LtyDhYH5YG8O3 V/vQ== X-Gm-Message-State: AOAM530YfoXh7riA2UeLLZP+pAzndbdu7SimFGmNEQ/unfZY8gUQzaGI h7sGfNydr8WcFC2eh2acREwxFs/QI0r0/5Q3Vw== X-Google-Smtp-Source: ABdhPJwPbrtPqKgJxZN0GMfy4j4SWUt238krR5GUkR73DdXN8ohQe0RrStSOWbJowYQwm5ubj0jVlEIhcSWrXNtR764= X-Received: by 2002:a5d:9c91:: with SMTP id p17mr28997539iop.36.1607912426668; Sun, 13 Dec 2020 18:20:26 -0800 (PST) MIME-Version: 1.0 References: <1607433270-9807-1-git-send-email-kernelfans@gmail.com> In-Reply-To: From: Pingfan Liu Date: Mon, 14 Dec 2020 10:20:15 +0800 Message-ID: Subject: Re: [PATCH] arm64/irq: use NMI to send stop IPI To: Marc Zyngier X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201213_212035_134450_70DDDCA1 X-CRM114-Status: GOOD ( 15.58 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Catalin Marinas , Will Deacon , linux-arm-kernel@lists.infradead.org, Julien Thierry Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Dec 8, 2020 at 10:04 PM Marc Zyngier wrote: > > On 2020-12-08 13:14, Pingfan Liu wrote: > > Like other arches, both 'kexec -l' and 'kexec -p' expect to use NMI to > > interrupt other cpus in order to capture cpus tightly to a known state. > > > > So for both of the cases, try to use NMI IPI if irqchip supports NMI. > > There are at least 2 other competing series doing the same thing, > and (ab)using NMIs for dubious purposes (kexec, kgdb...) > I think kexec has a good justification, but start with (2) at present. > (1) Please work with others instead of reinventing things from scratch, > with similar problems > I will. > (2) No additional NMI patches will make it until we have resolved the > issues > described in [1], which is likely to take some time > After serval days of chasing this issue, I have a raw idea about it. What about re-structure the code like DEFINE_IDTENTRY_SYSVEC_SIMPLE(sysvec_reschedule_ipi) ? I will send a series soon afterward. Thanks, Pingfan > Thanks, > > M. > > [1] > https://lore.kernel.org/linux-arm-kernel/87lfewnmdz.fsf@nanos.tec.linutronix.de/ > -- > Jazz is not dead. It just smells funny... _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel