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| author | Oleg Nesterov <oleg@tv-sign.ru> | 2008-04-30 00:52:38 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-30 08:29:34 -0700 |
| commit | d6cf723a142f63ccb92272bc0e9bfffd3c3a5cac (patch) | |
| tree | 16ec6665ebb03107d40f5ab0884ca7e8394b5358 /kernel/sys.c | |
| parent | 1406f2d321bae5ac5ff729dcb773336d9c05ec74 (diff) | |
| download | lwn-d6cf723a142f63ccb92272bc0e9bfffd3c3a5cac.tar.gz lwn-d6cf723a142f63ccb92272bc0e9bfffd3c3a5cac.zip | |
k_getrusage: don't take rcu_read_lock()
Just a trivial example, more to come.
k_getrusage() holds rcu_read_lock() because it was previously required by
lock_task_sighand(). Unneeded now.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/sys.c')
| -rw-r--r-- | kernel/sys.c | 7 |
1 files changed, 1 insertions, 6 deletions
diff --git a/kernel/sys.c b/kernel/sys.c index e423d0d9e6ff..47c30a20b554 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -1572,11 +1572,8 @@ static void k_getrusage(struct task_struct *p, int who, struct rusage *r) goto out; } - rcu_read_lock(); - if (!lock_task_sighand(p, &flags)) { - rcu_read_unlock(); + if (!lock_task_sighand(p, &flags)) return; - } switch (who) { case RUSAGE_BOTH: @@ -1612,9 +1609,7 @@ static void k_getrusage(struct task_struct *p, int who, struct rusage *r) default: BUG(); } - unlock_task_sighand(p, &flags); - rcu_read_unlock(); out: cputime_to_timeval(utime, &r->ru_utime); |