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[PATCH] remove __put_task_struct_cb export again

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The patch '[PATCH] RCU signal handling' [1] added an export for
__put_task_struct_cb, a put_task_struct helper newly introduced in that
patch.  But the put_task_struct couldn't be used modular previously as
__put_task_struct wasn't exported.  There are not callers of it in modular
code, and it shouldn't be exported because we don't want drivers to hold
references to task_structs.

This patch removes the export and folds __put_task_struct into
__put_task_struct_cb as there's no other caller.

[1] http://www2.kernel.org/git/gitweb.cgi?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=e56d090310d7625ecb43a1eeebd479f04affb48b

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Paul E. McKenney <paulmck@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Christoph Hellwig 2006-03-11 03:27:18 -08:00 committed by Linus Torvalds
parent 27d162e26a
commit 7cd9013be6
3 changed files with 3 additions and 9 deletions
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1
include/linux/sched.h
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@ -892,7 +892,6 @@ static inline int pid_alive(struct task_struct *p)
}
extern void free_task(struct task_struct *tsk);
extern void __put_task_struct(struct task_struct *tsk);
#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
extern void __put_task_struct_cb(struct rcu_head *rhp);

4
kernel/fork.c
View File

@ -108,8 +108,10 @@ void free_task(struct task_struct *tsk)
}
EXPORT_SYMBOL(free_task);
void __put_task_struct(struct task_struct *tsk)
void __put_task_struct_cb(struct rcu_head *rhp)
{
struct task_struct *tsk = container_of(rhp, struct task_struct, rcu);
WARN_ON(!(tsk->exit_state & (EXIT_DEAD | EXIT_ZOMBIE)));
WARN_ON(atomic_read(&tsk->usage));
WARN_ON(tsk == current);

7
kernel/sched.c
View File

@ -178,13 +178,6 @@ static unsigned int task_timeslice(task_t *p)
#define task_hot(p, now, sd) ((long long) ((now) - (p)->last_ran) \
< (long long) (sd)->cache_hot_time)
void __put_task_struct_cb(struct rcu_head *rhp)
{
__put_task_struct(container_of(rhp, struct task_struct, rcu));
}
EXPORT_SYMBOL_GPL(__put_task_struct_cb);
/*
* These are the runqueue data structures:
*/