[PATCH] taskstats: cleanup ->signal->stats allocation

Allocate ->signal->stats on demand in taskstats_exit(), this allows us to
remove taskstats_tgid_alloc() (the last non-trivial inline) from taskstat's
public interface.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Shailabh Nagar <nagar@watson.ibm.com>
Cc: Jay Lan <jlan@engr.sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 0 insertions, 24 deletions

diff --git a/include/linux/taskstats_kern.h b/include/linux/taskstats_kern.h
index f1261a532496..7e9680f4afdd 100644
--- a/include/linux/taskstats_kern.h
+++ b/include/linux/taskstats_kern.h
@@ -20,28 +20,6 @@ static inline void taskstats_tgid_init(struct signal_struct *sig)
         sig->stats = NULL;
 }
 
-static inline void taskstats_tgid_alloc(struct task_struct *tsk)
-{
-        struct signal_struct *sig = tsk->signal;
-        struct taskstats *stats;
-
-        if (sig->stats != NULL)
-                return;
-
-        /* No problem if kmem_cache_zalloc() fails */
-        stats = kmem_cache_zalloc(taskstats_cache, GFP_KERNEL);
-
-        spin_lock_irq(&tsk->sighand->siglock);
-        if (!sig->stats) {
-                sig->stats = stats;
-                stats = NULL;
-        }
-        spin_unlock_irq(&tsk->sighand->siglock);
-
-        if (stats)
-                kmem_cache_free(taskstats_cache, stats);
-}
-
 static inline void taskstats_tgid_free(struct signal_struct *sig)
 {
         if (sig->stats)
@@ -55,8 +33,6 @@ static inline void taskstats_exit(struct task_struct *tsk, int group_dead)
 {}
 static inline void taskstats_tgid_init(struct signal_struct *sig)
 {}
-static inline void taskstats_tgid_alloc(struct task_struct *tsk)
-{}
 static inline void taskstats_tgid_free(struct signal_struct *sig)
 {}
 static inline void taskstats_init_early(void)