Hi, The goal is this patch series is to decouple TWA_SIGNAL based task_work from real signals and signal delivery. The motivation is speeding up TWA_SIGNAL based task_work, particularly for threaded setups where ->sighand is shared across threads. Patch 1 is just a cleanup patchs, since I noticed that notify_resume handling has some arch redundancy.. Patch 2 provides an abstraction around signal_pending(), in preparation for allowing TIF_NOTIFY_SIGNAL to break scheduling loops. Patch 3 just splits system call restart handling from the arch signal delivery. Only the generic entry code is updated. Patch 4 adds generic support for TIF_NOTIFY_SIGNAL, calling the appropriate tracehook_notify_signal() if TIF_NOTIFY_SIGNAL is set. Patch 5 just defines TIF_NOTIFY_SIGNAL for x86, since the generic code is now ready for it. Patch 6 finally allows task_work to use notify_signal to handle TWA_SIGNAL based task_work. Changes since v2: - notify resume cleanup - split patch series - improve commit messages and comments - kvm TIF_NOTIFY_SIGNAL handling -- Jens Axboe
