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 3CF14CCFA04 for ; Tue, 4 Nov 2025 13:58:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=hYXcLzRaG8iNicTNR/jlMvoxSdUH1yGmuASCkq475x8=; b=qQohgQx3FDdnkYPZ/i92rNxpeM W2il7MrkWPCJqE2tE3GSQQjeTcYznrb98JY9hzzLXlyzXNfxVGb8DdE2B2bdO5uXLC5uFGVT0P/vu dDG9HJ5NV5FtffS0EUVcBg+5HI/3V6JV3hGRhhjt0zezaj1l2VsJw5QHTD0bykcDDgGmeElZ7g9B+ 5JEwsDgqjP1rQrYnHecLKEZMsu3as3UOxYC7PwfsVeewG1+Cau8LzL8821CmNwPfHHK+BX3UZfhAU grNGXrDhB8XTm8x2p3Iku3vK49RUieAl3Yx3ervSy2pqcazUtjL/Y3uxkfkd1jqZRPGh/MAPE4lFE 1dyu7enQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vGHYD-0000000BwBV-1vWZ; Tue, 04 Nov 2025 13:58:21 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vGHYB-0000000BwAA-1ly9 for linux-arm-kernel@lists.infradead.org; Tue, 04 Nov 2025 13:58:20 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id A1B10401A3; Tue, 4 Nov 2025 13:58:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4F1C9C4CEF7; Tue, 4 Nov 2025 13:58:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1762264698; bh=4K46elwz2t41thzEDIlkodjmZEybmO5RrzNgtf0xipA=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=FTuYizHQP/YaIbgF3vqNbGgvB8bHF6TItco2OMyJ9evUpo+GBr20DxE5Jer8+p4K1 Q+hFVJhn3gpVicQ2H0Ofyp6uCJN9ymtHFPPLDjxYfofm6lejPtS8XJgwAO5RL0xfrh 9nW/y6m3o1sA+lBbGYZwON+Afz1yEkvdQnsCyZWZFCuBjMh861BJOgw4ddIegP8vWw CDy27YlcgnSzhLSu0KN0TojEMMqpNqXy0n7zprfWIzmZl2LTtr0cVzEatQl7Bl8m/u lzMahpVNdy0kWug9HG1JgJqN1YX431c9LR57rP8r6A6CK5d+uRJpVZCbr+WC/wtS7y aFF7c7dek1JVQ== Date: Tue, 4 Nov 2025 13:58:13 +0000 From: Will Deacon To: Ryo Takakura Cc: catalin.marinas@arm.com, bigeasy@linutronix.de, clrkwllms@kernel.org, rostedt@goodmis.org, leitao@debian.org, mark.rutland@arm.com, ardb@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev Subject: Re: [PATCH] arm64: use SOFTIRQ_ON_OWN_STACK for enabling softirq stack Message-ID: References: <20251013013508.74677-1-ryotkkr98@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251013013508.74677-1-ryotkkr98@gmail.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251104_055819_477721_E5230C2F X-CRM114-Status: GOOD ( 16.94 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Oct 13, 2025 at 01:35:08AM +0000, Ryo Takakura wrote: > For those architectures with HAVE_SOFTIRQ_ON_OWN_STACK use > their dedicated softirq stack when !PREEMPT_RT. This condition > is ensured by SOFTIRQ_ON_OWN_STACK. > > Let arm64 use SOFTIRQ_ON_OWN_STACK as well to select its > usage of the stack. > > Signed-off-by: Ryo Takakura > --- > arch/arm64/kernel/irq.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/arm64/kernel/irq.c b/arch/arm64/kernel/irq.c > index c0065a1d77cf..15dedb385b9e 100644 > --- a/arch/arm64/kernel/irq.c > +++ b/arch/arm64/kernel/irq.c > @@ -62,7 +62,7 @@ static void __init init_irq_stacks(void) > } > } > > -#ifndef CONFIG_PREEMPT_RT > +#ifdef CONFIG_SOFTIRQ_ON_OWN_STACK > static void ____do_softirq(struct pt_regs *regs) > { > __do_softirq(); Acked-by: Will Deacon Will