ia64: ptrace_attach_sync_user_rbs: avoid "task->signal != NULL" checks
authorOleg Nesterov <oleg@redhat.com>
Wed, 26 May 2010 21:43:14 +0000 (14:43 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 27 May 2010 16:12:46 +0000 (09:12 -0700)
commitffdf91856c812646aa276711fa7e3ad80b00764a
tree0a6d0e6e1edb78aee411c3fb302c43acf34dc7d6
parentd30fda355188272430d3865db2ff9e24b4135ae3
ia64: ptrace_attach_sync_user_rbs: avoid "task->signal != NULL" checks

Preparation to make task->signal immutable, no functional changes.

It doesn't matter which pointer we check under tasklist to ensure the task
was not released, ->signal or ->sighand.  But we are going to make
->signal refcountable, change the code to use ->sighand.

Note: this code doesn't need this check and tasklist_lock at all, it
should be converted to use lock_task_sighand().  And, the code under
SIGNAL_STOP_STOPPED check looks wrong.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
arch/ia64/kernel/ptrace.c