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-rw-r--r--include/linux/delayacct.h10
-rw-r--r--include/linux/sched.h1
-rw-r--r--kernel/delayacct.c16
-rw-r--r--kernel/exit.c1
-rw-r--r--kernel/fork.c6
5 files changed, 11 insertions, 23 deletions
diff --git a/include/linux/delayacct.h b/include/linux/delayacct.h
index 11487b6..561e2a7 100644
--- a/include/linux/delayacct.h
+++ b/include/linux/delayacct.h
@@ -59,10 +59,14 @@ static inline void delayacct_tsk_init(struct task_struct *tsk)
__delayacct_tsk_init(tsk);
}
-static inline void delayacct_tsk_exit(struct task_struct *tsk)
+/* Free tsk->delays. Called from bad fork and __put_task_struct
+ * where there's no risk of tsk->delays being accessed elsewhere
+ */
+static inline void delayacct_tsk_free(struct task_struct *tsk)
{
if (tsk->delays)
- __delayacct_tsk_exit(tsk);
+ kmem_cache_free(delayacct_cache, tsk->delays);
+ tsk->delays = NULL;
}
static inline void delayacct_blkio_start(void)
@@ -101,7 +105,7 @@ static inline void delayacct_init(void)
{}
static inline void delayacct_tsk_init(struct task_struct *tsk)
{}
-static inline void delayacct_tsk_exit(struct task_struct *tsk)
+static inline void delayacct_tsk_free(struct task_struct *tsk)
{}
static inline void delayacct_blkio_start(void)
{}
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 6674fc1..34ed0d9 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -994,7 +994,6 @@ struct task_struct {
*/
struct pipe_inode_info *splice_pipe;
#ifdef CONFIG_TASK_DELAY_ACCT
- spinlock_t delays_lock;
struct task_delay_info *delays;
#endif
};
diff --git a/kernel/delayacct.c b/kernel/delayacct.c
index 57ca373..36752f1 100644
--- a/kernel/delayacct.c
+++ b/kernel/delayacct.c
@@ -41,24 +41,11 @@ void delayacct_init(void)
void __delayacct_tsk_init(struct task_struct *tsk)
{
- spin_lock_init(&tsk->delays_lock);
- /* No need to acquire tsk->delays_lock for allocation here unless
- __delayacct_tsk_init called after tsk is attached to tasklist
- */
tsk->delays = kmem_cache_zalloc(delayacct_cache, SLAB_KERNEL);
if (tsk->delays)
spin_lock_init(&tsk->delays->lock);
}
-void __delayacct_tsk_exit(struct task_struct *tsk)
-{
- struct task_delay_info *delays = tsk->delays;
- spin_lock(&tsk->delays_lock);
- tsk->delays = NULL;
- spin_unlock(&tsk->delays_lock);
- kmem_cache_free(delayacct_cache, delays);
-}
-
/*
* Start accounting for a delay statistic using
* its starting timestamp (@start)
@@ -118,8 +105,6 @@ int __delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk)
struct timespec ts;
unsigned long t1,t2,t3;
- spin_lock(&tsk->delays_lock);
-
/* Though tsk->delays accessed later, early exit avoids
* unnecessary returning of other data
*/
@@ -161,7 +146,6 @@ int __delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk)
spin_unlock(&tsk->delays->lock);
done:
- spin_unlock(&tsk->delays_lock);
return 0;
}
diff --git a/kernel/exit.c b/kernel/exit.c
index dba194a..a4c19a5 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -908,7 +908,6 @@ fastcall NORET_TYPE void do_exit(long code)
audit_free(tsk);
taskstats_exit_send(tsk, tidstats, group_dead, mycpu);
taskstats_exit_free(tidstats);
- delayacct_tsk_exit(tsk);
exit_mm(tsk);
diff --git a/kernel/fork.c b/kernel/fork.c
index aa36c43..f9b014e 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -117,6 +117,7 @@ void __put_task_struct(struct task_struct *tsk)
security_task_free(tsk);
free_uid(tsk->user);
put_group_info(tsk->group_info);
+ delayacct_tsk_free(tsk);
if (!profile_handoff_task(tsk))
free_task(tsk);
@@ -1011,7 +1012,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
retval = -EFAULT;
if (clone_flags & CLONE_PARENT_SETTID)
if (put_user(p->pid, parent_tidptr))
- goto bad_fork_cleanup;
+ goto bad_fork_cleanup_delays_binfmt;
INIT_LIST_HEAD(&p->children);
INIT_LIST_HEAD(&p->sibling);
@@ -1277,7 +1278,8 @@ bad_fork_cleanup_policy:
bad_fork_cleanup_cpuset:
#endif
cpuset_exit(p);
-bad_fork_cleanup:
+bad_fork_cleanup_delays_binfmt:
+ delayacct_tsk_free(p);
if (p->binfmt)
module_put(p->binfmt->module);
bad_fork_cleanup_put_domain:
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