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[34.124.206.92]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3087e05e90bsm8276853a91.45.2025.04.22.03.46.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 22 Apr 2025 03:46:18 -0700 (PDT) From: Zhiwei Jiang To: viro@zeniv.linux.org.uk Cc: brauner@kernel.org, jack@suse.cz, akpm@linux-foundation.org, peterx@redhat.com, axboe@kernel.dk, asml.silence@gmail.com, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, io-uring@vger.kernel.org, Zhiwei Jiang Subject: [PATCH 2/2] userfaultfd: Set the corresponding flag in IOU worker context Date: Tue, 22 Apr 2025 10:45:45 +0000 Message-Id: <20250422104545.1199433-3-qq282012236@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250422104545.1199433-1-qq282012236@gmail.com> References: <20250422104545.1199433-1-qq282012236@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Set this to avoid premature return from schedule in IOU worker threads, ensuring it sleeps and waits to be woken up as in normal cases. Signed-off-by: Zhiwei Jiang --- fs/userfaultfd.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c index d80f94346199..74bead069e85 100644 --- a/fs/userfaultfd.c +++ b/fs/userfaultfd.c @@ -32,6 +32,7 @@ #include #include #include +#include "../io_uring/io-wq.h" =20 static int sysctl_unprivileged_userfaultfd __read_mostly; =20 @@ -369,7 +370,10 @@ vm_fault_t handle_userfault(struct vm_fault *vmf, unsi= gned long reason) vm_fault_t ret =3D VM_FAULT_SIGBUS; bool must_wait; unsigned int blocking_state; + struct io_worker *worker =3D current->worker_private; =20 + if (worker) + set_userfault_flag_for_ioworker(worker); /* * We don't do userfault handling for the final child pid update * and when coredumping (faults triggered by get_dump_page()). @@ -506,6 +510,9 @@ vm_fault_t handle_userfault(struct vm_fault *vmf, unsig= ned long reason) =20 __set_current_state(TASK_RUNNING); =20 + if (worker) + clear_userfault_flag_for_ioworker(worker); + /* * Here we race with the list_del; list_add in * userfaultfd_ctx_read(), however because we don't ever run --=20 2.34.1