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[210.128.90.14]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29601998991sm50485145ad.32.2025.11.04.23.33.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 04 Nov 2025 23:33:24 -0800 (PST) From: Ryo Takakura To: will@kernel.org, bigeasy@linutronix.de Cc: ardb@kernel.org, catalin.marinas@arm.com, clrkwllms@kernel.org, leitao@debian.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev, mark.rutland@arm.com, rostedt@goodmis.org, ryotkkr98@gmail.com Subject: Re: [PATCH] arm64: use SOFTIRQ_ON_OWN_STACK for enabling softirq stack Date: Wed, 5 Nov 2025 16:33:20 +0900 Message-Id: <20251105073320.208335-1-ryotkkr98@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251104_233326_097617_82BF63C6 X-CRM114-Status: GOOD ( 13.68 ) 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 Hi! On Tue, 4 Nov 2025 13:58:13 +0000, Will Deacon wrote: >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 Thanks Sebastian and Will for checking! I'll shortly send v2 with the tags. Sincerely, Ryo Takakura >Will