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trim task_work: get rid of hlist

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layout based on Oleg's suggestion; single-linked list,
task->task_works points to the last element, forward pointer
from said last element points to head.  I'd still prefer
much more regular scheme with two pointers in task_work,
but...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-06-27 09:24:13 +04:00
commit 158e1645e0
5 changed files with 38 additions and 36 deletions
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2
include/linux/sched.h
View file

@ -1405,7 +1405,7 @@ struct task_struct {
int (*notifier)(void *priv);
void *notifier_data;
sigset_t *notifier_mask;
struct hlist_head task_works;
void *task_works;
struct audit_context *audit_context;
#ifdef CONFIG_AUDITSYSCALL

4
include/linux/task_work.h
View file

@ -8,7 +8,7 @@ struct task_work;
typedef void (*task_work_func_t)(struct task_work *);
struct task_work {
struct hlist_node hlist;
struct task_work *next;
task_work_func_t func;
};
@ -24,7 +24,7 @@ void task_work_run(void);
static inline void exit_task_work(struct task_struct *task)
{
if (unlikely(!hlist_empty(&task->task_works)))
if (unlikely(task->task_works))
task_work_run();
}

2
include/linux/tracehook.h
View file

@ -192,7 +192,7 @@ static inline void tracehook_notify_resume(struct pt_regs *regs)
* hlist_add_head(task->task_works);
*/
smp_mb__after_clear_bit();
if (unlikely(!hlist_empty(&current->task_works)))
if (unlikely(current->task_works))
task_work_run();
}