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Tue, 05 Oct 2021 05:26:20 -0700 (PDT) X-Gm-Message-State: AOAM531dO1lIC5psZfvkdcSAXGsgiWyK+87MRdbS8FxLNOcFXSEtNZg6 XE+eQsxG74y3NxXABuad1TZyzaGVkkk0ULmoEjI= X-Google-Smtp-Source: ABdhPJwCp870BQ05d4PuHe+rcIhWCEa3KL0O6J57igUeztGYxlGqDtqpsTu2JJhGGKU46AvBeBRPI2n61DG33HUPykw= X-Received: by 2002:a7b:c10e:: with SMTP id w14mr3184192wmi.98.1633436780511; Tue, 05 Oct 2021 05:26:20 -0700 (PDT) MIME-Version: 1.0 References: <20211005071542.3127341-1-ardb@kernel.org> <20211005071542.3127341-8-ardb@kernel.org> In-Reply-To: <20211005071542.3127341-8-ardb@kernel.org> From: Arnd Bergmann Date: Tue, 5 Oct 2021 14:26:04 +0200 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v2 7/9] ARM: implement IRQ stacks To: Ard Biesheuvel Cc: Linux ARM , Russell King - ARM Linux , Arnd Bergmann , Kees Cook , Keith Packard , Linus Walleij X-Provags-ID: V03:K1:evvh1CryHZt7rzTmrhndXn9n1mNPu/pVORrIYeNdFLC9mL3glPG oqIZ+uKfEcJKpiSTaM5pubZbbYq7Svzfh2nwBoKtbRPDmz7IqDZTY5GG+lQar2HI1xjeHL3 n8ZaVpVbA9dSrJQ3h+xQ3SpNO1twqQI4piFQRkn2nn7eWB4blYR1/YZebDXZ0/gXBQ/Ahfg zYwCBaYgF+bsJS3BoIcAw== X-UI-Out-Filterresults: notjunk:1;V03:K0:mFKUiKbzN/Y=:cNGbhitm1n1BvNTt3lcmm1 27XyQ1XgBft1rqA7HVV6vtbT9XcbqhvoExJTxj3Grz2lXOvGg28qbXoS7qp2sH2Z/699Ak+od 30upE0/79+xFP0UXqzvyDfausqhTexOsy/o/pgvUKnz9rr13ySRkUU+O+NcuFioKvaeczZtBb ifggB9DwV3815T3lr0I5TeGq9YTfYg6Y6opOy2Jkm4u0x77ITAfGsAyHro/39CbmwkAb+QPTT r/YTWqjru75ZEgPB7YX7lFpqVvDtPtuBBNF3rwNM9XhiQDVRR7/m16CA+1L0zdApP8U8KVwjg y8zlUO6anCuYNqj/9m0GDRU/6XlYJbuyCF6hYNCVHZ4gs8YG/1Tfl7JwNfL0M4qdb2389HWW+ OfwwiqxiRyjtuBs8qlstSSLdEVENElfgDuBF/X5ZHWFacHkhcXk3cNVM0xxRu1VHcU+OzPLC3 hWhya7SAwmgd8/3b3VLFNJukFgFSaSe4gcAQKlpD9JJFovwu8lqmjn1712+Id2P6ewNDoa1qz Afngh6mUz9iIAW4VPDS4S1pwxoolvJRMRTckyzrVmTdGEZipVsp1ivxGb81dQyLjtkxHcKCu2 iPbCuXFqSQv0Pvhpi3OKu/kV2iLe6heaq6KA9K4ks7JJPVzA0H2bjWF7yEBelYzwPHFAwRCsq 0GEEg5/ehcRyYKBdzKWnUbeIkpirWRfGPmGmK1r39YThoA8gqVLyyn24y0Slr7gn/JkozgJAW QT7fct7bxAKUbl20ENWzPWQX1at60VzKp5x3grevwm50oOtCGlvVI8ei5dqpVm9aXSz6gb7q2 vgj9Qu3FYfHdgIb3anhvmuNn/yRnGKIOEEgxqQcGDLyquVsKuwiB/FxpdYGWdlIS+/r74YwW0 yuCr92EJofDgkaLbkWWA== X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211005_052625_773496_8EC73EF7 X-CRM114-Status: GOOD ( 17.16 ) 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 On Tue, Oct 5, 2021 at 9:15 AM Ard Biesheuvel wrote: > > Now that we no longer rely on the stack pointer to access the current > task struct or thread info, we can implement support for IRQ stacks > cleanly as well. > > Define a per-CPU IRQ stack and switch to this stack when taking an IRQ, > provided that we were not already using that stack in the interrupted > context. This is never the case for IRQs taken from user space, but ones > taken while running in the kernel could fire while one taken from user > space has not completed yet. > > Signed-off-by: Ard Biesheuvel This is where I get stuck in my review, I assume it's all good here, but I can't honestly claim to have reviewed it without a better understanding. Hopefully one of the others on Cc can step in here and take a closer look. Arnd _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel