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Thu, 14 Jul 2022 04:50:42 -0700 (PDT) Message-ID: <6541e3d2-69cc-2970-c7db-fde4d64a2f09@bytedance.com> Date: Thu, 14 Jul 2022 19:50:38 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Thunderbird/102.0 Subject: Re: [PATCH v1 1/2] arm64: run softirqs on the per-CPU IRQ stack Content-Language: en-US To: Arnd Bergmann Cc: Catalin Marinas , Will Deacon , Linux ARM , Linux Kernel Mailing List References: <20220708094950.41944-1-zhengqi.arch@bytedance.com> <20220708094950.41944-2-zhengqi.arch@bytedance.com> From: Qi Zheng In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220714_045045_925142_3C296DB9 X-CRM114-Status: GOOD ( 12.13 ) 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-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 2022/7/14 19:32, Arnd Bergmann wrote: > On Fri, Jul 8, 2022 at 11:49 AM Qi Zheng wrote: >> >> 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 > > This seems like a nice improvement, and this version addresses > my concern I raised on the RFC version. > > Reviewed-by: Arnd Bergmann Thanks for your review. :) -- Thanks, Qi _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel