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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 Thu, Aug 29, 2024 at 12:21:39PM -0700, Jiaqi Yan wrote: > I think we still want to attempt to SIGBUS userspace, regardless of > doing unmap_mapping_range or not. IMHO we need to eliminate this path if we actually want to keep things mapped. There is no way to generate the SIGBUS without poking a 4k hole in the 1G page, as only that 4k should get SIGBUS, every other byte of the 1G is clean. Jason