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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id F182DC433F5 for ; Tue, 11 Oct 2022 14:57:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=JVWdQQJApUKpnGgJmH+GFu2Q2T+lI9kdEFUQ/noHZEI=; b=22xYLGjn7j1G4A Cpr1KyF0JUBr119/JiPNS7RcnSxktvbvy1EyEm8dqIVdpDc/0tIw8ekQ7giq9/vQAhUXLBwg9zZ1i 7QkBrIo33ZZclDnswXYWG0+YrPrRHaBX2LbTJ3DSF7fINEIA1RYz3nGX4V5hHGqMiFyj5bgZwc8vy ZHeTAWMuZeu40gr2YRr86L35rvZh3EOAf2PpaUi9tFqX9Y+s7kUmcRO+z+XA/R3YS5RKlbv4qPVY/ mweRVf10HWOiTqvXidqjk02i1KsMhODcQk9+yJ8LH+jPG5C0ihO+rgNu0qGh1wan52bZNOarxP7dD 4BnU7xmtB0vqQrnNP13w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oiGgJ-004aat-Da; Tue, 11 Oct 2022 14:56:31 +0000 Received: from sin.source.kernel.org ([145.40.73.55]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oiGan-004XSA-P0 for linux-arm-kernel@lists.infradead.org; Tue, 11 Oct 2022 14:50:52 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sin.source.kernel.org (Postfix) with ESMTPS id D7B3ECE17EF; Tue, 11 Oct 2022 14:50:47 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 73820C433D7; Tue, 11 Oct 2022 14:50:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1665499846; bh=WwZXZfJykxDQbni6IAyyWtlqQ12LDgoTgDtcb4fzzRk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JxcwnmbKz2L+v63JCJkPbFwWJ/olgnWpXNAAtYW2LqxdeAPIYmZxoD/Op1IRyTIbv vrV7K6cXZqXyfWVSbfNgzBYTe3tR1DffHwB1KATa6QbVQPHeeMYyfkfJIujjMUmMSF WAc2xCr/ElwLhixTgkXsy1ktpxs/LTrnXoOJOmqptqVrWv6uueMj7yQz9WojyQ7/ac sRggc9c50g/sNKi7bl1t1pFtH7fpt9MNthJTT1dxL8u9nEvP5evLfvpLLbtQIyKf5J aZ49AU0PQJnnVX7DH3QZGUIUNZBhWYYqTlSMFphzdZpstOALEJQ6FEgulbMBOf21HB ikFycG+GwlJtA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Qi Zheng , Arnd Bergmann , Will Deacon , Catalin Marinas , Sasha Levin , linux-arm-kernel@lists.infradead.org Subject: [PATCH AUTOSEL 6.0 18/46] arm64: run softirqs on the per-CPU IRQ stack Date: Tue, 11 Oct 2022 10:49:46 -0400 Message-Id: <20221011145015.1622882-18-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20221011145015.1622882-1-sashal@kernel.org> References: <20221011145015.1622882-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221011_075050_046550_75E09A3F X-CRM114-Status: GOOD ( 12.58 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 From: Qi Zheng [ Upstream commit 8eb858c44b98e0326bb32fca34ae671995cd73bb ] Currently arm64 supports per-CPU IRQ stack, but softirqs are still handled in the task context. Since any call to local_bh_enable() at any level in the task's call stack may trigger a softirq processing run, which could potentially cause a task stack overflow if the combined stack footprints exceed the stack's size, let's run these softirqs on the IRQ stack as well. Signed-off-by: Qi Zheng Reviewed-by: Arnd Bergmann Acked-by: Will Deacon Link: https://lore.kernel.org/r/20220815124739.15948-1-zhengqi.arch@bytedance.com Signed-off-by: Catalin Marinas Signed-off-by: Sasha Levin --- arch/arm64/Kconfig | 1 + arch/arm64/kernel/irq.c | 14 ++++++++++++++ 2 files changed, 15 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 1ce7685ad5de..68ee7146bdb9 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -230,6 +230,7 @@ config ARM64 select HAVE_ARCH_USERFAULTFD_MINOR if USERFAULTFD select TRACE_IRQFLAGS_SUPPORT select TRACE_IRQFLAGS_NMI_SUPPORT + select HAVE_SOFTIRQ_ON_OWN_STACK help ARM 64-bit (AArch64) Linux support. diff --git a/arch/arm64/kernel/irq.c b/arch/arm64/kernel/irq.c index bda49430c9ea..38dbd3828f13 100644 --- a/arch/arm64/kernel/irq.c +++ b/arch/arm64/kernel/irq.c @@ -21,7 +21,9 @@ #include #include #include +#include #include +#include /* Only access this in an NMI enter/exit */ DEFINE_PER_CPU(struct nmi_ctx, nmi_contexts); @@ -71,6 +73,18 @@ static void init_irq_stacks(void) } #endif +#ifndef CONFIG_PREEMPT_RT +static void ____do_softirq(struct pt_regs *regs) +{ + __do_softirq(); +} + +void do_softirq_own_stack(void) +{ + call_on_irq_stack(NULL, ____do_softirq); +} +#endif + static void default_handle_irq(struct pt_regs *regs) { panic("IRQ taken without a root IRQ handler\n"); -- 2.35.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel