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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 517D4C433FE for ; Wed, 27 Oct 2021 15:15:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 37DB3604E9 for ; Wed, 27 Oct 2021 15:15:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242714AbhJ0PRj (ORCPT ); Wed, 27 Oct 2021 11:17:39 -0400 Received: from foss.arm.com ([217.140.110.172]:44402 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233978AbhJ0PRi (ORCPT ); Wed, 27 Oct 2021 11:17:38 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 70E81ED1; Wed, 27 Oct 2021 08:15:12 -0700 (PDT) Received: from e113632-lin.cambridge.arm.com (e113632-lin.cambridge.arm.com [10.1.196.57]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 1F8CD3F70D; Wed, 27 Oct 2021 08:15:11 -0700 (PDT) From: Valentin Schneider To: linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Will Deacon , Mark Rutland , Marc Zyngier , Thomas Gleixner , Sebastian Andrzej Siewior , Ard Biesheuvel Subject: [PATCH v2 0/3] irqchip/gic-v3-its: Fix LPI pending table handling vs PREEMPT_RT Date: Wed, 27 Oct 2021 16:15:03 +0100 Message-Id: <20211027151506.2085066-1-valentin.schneider@arm.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi folks, This is my take at fixing [1]. Reading about the LPI tables situation was entertaining. Tested against kexec on an Ampere eMAG. Seems to be working fine atop 5.15-rc6. On the other hand, I can only issue one kexec from 5.15-rc6-rt12 - if I then issue another one on the new kernel, I get tasks hanging. That is true even without my patches and without CONFIG_PREEMPT_RT. [1]: http://lore.kernel.org/r/20210810134127.1394269-3-valentin.schneider@arm.com Revisions ========= v1 -> v2 ++++++++ o Ditched RDIST_FLAGS renaming; moved to "RD_LOCAL" prefix for new flags (Marc) o Simplified cpuhp callback logic: body now runs at most once per CPU o Changed cpuhp callback installation to happen *after* the BP has invoked its_cpu_init(); the BP cpuhp state is immediately set to CPUHP_ONLINE, so cpuhp state alone doesn't guarantee its_cpu_init() has been run. Cheers, Valentin Valentin Schneider (3): irqchip/gic-v3-its: Give the percpu rdist struct its own flags field irqchip/gic-v3-its: Postpone LPI pending table freeing and memreserve irqchip/gic-v3-its: Limit memreserve cpuhp state lifetime drivers/irqchip/irq-gic-v3-its.c | 82 +++++++++++++++++++++++++++--- drivers/irqchip/irq-gic-v3.c | 1 + include/linux/irqchip/arm-gic-v3.h | 4 +- 3 files changed, 79 insertions(+), 8 deletions(-) -- 2.25.1