[PATCH] pid: simplify pid iterators
I think it is hardly possible to read the current do_each_task_pid(). The new version is much simpler and makes the code smaller. Only the do_each_task_pid change is tested, the do_each_pid_task isn't. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -102,42 +102,29 @@ static inline pid_t pid_nr(struct pid *pid)
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return nr;
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}
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#define pid_next(task, type) \
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((task)->pids[(type)].node.next)
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#define pid_next_task(task, type) \
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hlist_entry(pid_next(task, type), struct task_struct, \
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pids[(type)].node)
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/* We could use hlist_for_each_entry_rcu here but it takes more arguments
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* than the do_each_task_pid/while_each_task_pid. So we roll our own
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* to preserve the existing interface.
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*/
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#define do_each_task_pid(who, type, task) \
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if ((task = find_task_by_pid_type(type, who))) { \
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prefetch(pid_next(task, type)); \
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do {
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do { \
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struct hlist_node *pos___; \
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struct pid *pid___ = find_pid(who); \
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if (pid___ != NULL) \
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hlist_for_each_entry_rcu((task), pos___, \
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&pid___->tasks[type], pids[type].node) {
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#define while_each_task_pid(who, type, task) \
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} while (pid_next(task, type) && ({ \
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task = pid_next_task(task, type); \
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rcu_dereference(task); \
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prefetch(pid_next(task, type)); \
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1; }) ); \
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}
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} \
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} while (0)
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#define do_each_pid_task(pid, type, task) \
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if ((task = pid_task(pid, type))) { \
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prefetch(pid_next(task, type)); \
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do {
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do { \
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struct hlist_node *pos___; \
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if (pid != NULL) \
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hlist_for_each_entry_rcu((task), pos___, \
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&pid->tasks[type], pids[type].node) {
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#define while_each_pid_task(pid, type, task) \
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} while (pid_next(task, type) && ({ \
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task = pid_next_task(task, type); \
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rcu_dereference(task); \
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prefetch(pid_next(task, type)); \
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1; }) ); \
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}
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} \
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} while (0)
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#endif /* _LINUX_PID_H */
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