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| author | Oleg Nesterov <oleg@redhat.com> | 2010-05-26 14:43:14 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-05-27 09:12:46 -0700 |
| commit | ffdf91856c812646aa276711fa7e3ad80b00764a (patch) | |
| tree | 0a6d0e6e1edb78aee411c3fb302c43acf34dc7d6 /arch/ia64 | |
| parent | d30fda355188272430d3865db2ff9e24b4135ae3 (diff) | |
| download | linux-stable-ffdf91856c812646aa276711fa7e3ad80b00764a.tar.gz linux-stable-ffdf91856c812646aa276711fa7e3ad80b00764a.tar.bz2 linux-stable-ffdf91856c812646aa276711fa7e3ad80b00764a.zip | |
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>
Diffstat (limited to 'arch/ia64')
| -rw-r--r-- | arch/ia64/kernel/ptrace.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/ia64/kernel/ptrace.c b/arch/ia64/kernel/ptrace.c index 0dec7f702448..7c7909f9bc93 100644 --- a/arch/ia64/kernel/ptrace.c +++ b/arch/ia64/kernel/ptrace.c @@ -638,7 +638,7 @@ ptrace_attach_sync_user_rbs (struct task_struct *child) */ read_lock(&tasklist_lock); - if (child->signal) { + if (child->sighand) { spin_lock_irq(&child->sighand->siglock); if (child->state == TASK_STOPPED && !test_and_set_tsk_thread_flag(child, TIF_RESTORE_RSE)) { @@ -662,7 +662,7 @@ ptrace_attach_sync_user_rbs (struct task_struct *child) * job control stop, so that SIGCONT can be used to wake it up. */ read_lock(&tasklist_lock); - if (child->signal) { + if (child->sighand) { spin_lock_irq(&child->sighand->siglock); if (child->state == TASK_TRACED && (child->signal->flags & SIGNAL_STOP_STOPPED)) { |