exit: ptrace: shift "reap dead" code from exit_ptrace() to forget_original_parent()
authorOleg Nesterov <oleg@redhat.com>
Wed, 10 Dec 2014 23:45:33 +0000 (15:45 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 11 Dec 2014 01:41:10 +0000 (17:41 -0800)
commit7c8bd2322c7fd973d089b27de55e29c92c667a06
tree8d9c9d6dbc32eabc303368d913dab3c683b94e2d
parent2831096e21503897ee474c23131c3feb8db0ffb1
exit: ptrace: shift "reap dead" code from exit_ptrace() to forget_original_parent()

Now that forget_original_parent() uses ->ptrace_entry for EXIT_DEAD tasks,
we can simply pass "dead_children" list to exit_ptrace() and remove
another release_task() loop.  Plus this way we do not need to drop and
reacquire tasklist_lock.

Also shift the list_empty(ptraced) check, if we want this optimization it
makes sense to eliminate the function call altogether.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Aaron Tomlin <atomlin@redhat.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
Cc: Sterling Alexander <stalexan@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Roland McGrath <roland@hack.frob.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
include/linux/ptrace.h
kernel/exit.c
kernel/ptrace.c