[for-next][PATCH 2/3] tracing: Change syscall_*regfunc() to check PF_KTHREAD and use for_each_process_thread()

From: Oleg Nesterov 1. Remove _irqsafe from syscall_regfunc/syscall_unregfunc, read_lock(tasklist) doesn't need to disable irqs. 2. Change this code to avoid the deprecated do_each_thread() and use for_each_process_thread() (stolen from the patch from Frederic). 3. Change

[for-next][PATCH 2/3] tracing: Change syscall_*regfunc() to check PF_KTHREAD and use for_each_process_thread()

From: Oleg Nesterov o...@redhat.com 1. Remove _irqsafe from syscall_regfunc/syscall_unregfunc, read_lock(tasklist) doesn't need to disable irqs. 2. Change this code to avoid the deprecated do_each_thread() and use for_each_process_thread() (stolen from the patch from Frederic). 3.