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Fri, 27 Nov 2020 22:15:33 +0800 From: Hanks Chen To: Thomas Gleixner , Jason Cooper , Marc Zyngier , Matthias Brugger , Russell King , Catalin Marinas , Will Deacon , Mark Rutland Subject: [PATCH v1 3/3] arm64: disable irq on cpu shutdown flow Date: Fri, 27 Nov 2020 22:15:31 +0800 Message-ID: <1606486531-25719-4-git-send-email-hanks.chen@mediatek.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1606486531-25719-1-git-send-email-hanks.chen@mediatek.com> References: <1606486531-25719-1-git-send-email-hanks.chen@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201127_092545_694076_58ECEFAE X-CRM114-Status: GOOD ( 13.19 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: CC Hwang , Kuohong Wang , Hanks Chen , Loda Chou , linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org Disable irq on cpu shutdown flow to ensure interrupts did not bother this cpu after status as offline. To avoid suspicious RCU usage (0)[0:swapper/0]RCU used illegally from offline CPU! ... (0)[0:swapper/0]lockdep: [name:lockdep&]cpu_id = 0, cpu_is_offline = 1 Signed-off-by: Hanks Chen --- arch/arm64/kernel/smp.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index 82e75fc2c903..27a6553fa86f 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -308,6 +308,12 @@ int __cpu_disable(void) remove_cpu_topology(cpu); numa_remove_cpu(cpu); + /* + * we disable irq here to ensure interrupts + * did not bother this cpu after status as offline. + */ + local_irq_disable(); + /* * Take this CPU offline. Once we clear this, we can't return, * and we must not schedule until we're ready to give up the cpu. @@ -842,9 +848,10 @@ void arch_irq_work_raise(void) static void local_cpu_stop(void) { + local_daif_mask(); + set_cpu_online(smp_processor_id(), false); - local_daif_mask(); sdei_mask_local_cpu(); cpu_park_loop(); }