| commit | 3547ff3aefbe092ca35506c60c02e2d17a4f2199 | |
| author | Oleg Nesterov <oleg@tv-sign.ru> | |
| Wed, 30 Apr 2008 07:52:51 +0000 (30 00:52 -0700) | ||
| committer | Linus Torvalds <torvalds@linux-foundation.org> | |
| Wed, 30 Apr 2008 15:29:35 +0000 (30 08:29 -0700) | ||
| tree | 722222124ae06ef45947fae20913bbd71e179c49 | treesnapshot (tar.gz zip) |
| parent | 6e65acba7ca8169e38ab55d62d52f29a75fb141f | commitdiff |
signals: do_tkill: don't use tasklist_lock
Convert do_tkill() to use rcu_read_lock() + lock_task_sighand() to avoid
taking tasklist lock.
Note that we don't return an error if lock_task_sighand() fails, we pretend
the task dies after receiving the signal. Otherwise, we should fight with the
nasty races with mt-exec without having any advantage.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Convert do_tkill() to use rcu_read_lock() + lock_task_sighand() to avoid
taking tasklist lock.
Note that we don't return an error if lock_task_sighand() fails, we pretend
the task dies after receiving the signal. Otherwise, we should fight with the
nasty races with mt-exec without having any advantage.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| kernel/signal.c | diffblobblamehistory |