[PATCH 3/3] percpu-rwsem: introduce percpu_rw_semaphore->recursive mode

Add percpu_rw_semaphore->recursive boolean. If it is true then the recursive percpu_down_read() is safe, percpu_down_write() doesn't exclude the new readers, like cpu_hotplug_begin(). Signed-off-by: Oleg Nesterov --- include/linux/percpu-rwsem.h | 15 ++- kernel/events/uprobes.c

[PATCH 3/3] percpu-rwsem: introduce percpu_rw_semaphore-recursive mode

Add percpu_rw_semaphore-recursive boolean. If it is true then the recursive percpu_down_read() is safe, percpu_down_write() doesn't exclude the new readers, like cpu_hotplug_begin(). Signed-off-by: Oleg Nesterov o...@redhat.com --- include/linux/percpu-rwsem.h | 15 ++-