proc: change first_tid() to use while_each_thread() rather than next_thread()
Rerwrite the main loop to use while_each_thread() instead of next_thread(). We are going to fix or replace while_each_thread(), next_thread() should be avoided whenever possible. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Michal Hocko <mhocko@suse.cz> Cc: Sameer Nanda <snanda@chromium.org> Cc: Sergey Dyasly <dserrg@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -3106,23 +3106,23 @@ static struct task_struct *first_tid(struct task_struct *leader,
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}
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/* If nr exceeds the number of threads there is nothing todo */
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pos = NULL;
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if (nr && nr >= get_nr_threads(leader))
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goto out;
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goto fail;
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/* It could be unhashed before we take rcu lock */
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if (!pid_alive(leader))
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goto out;
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goto fail;
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/* If we haven't found our starting place yet start
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* with the leader and walk nr threads forward.
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*/
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for (pos = leader; nr > 0; --nr) {
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pos = next_thread(pos);
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if (pos == leader) {
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pos = NULL;
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goto out;
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}
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}
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pos = leader;
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do {
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if (nr-- <= 0)
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goto found;
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} while_each_thread(leader, pos);
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fail:
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pos = NULL;
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goto out;
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found:
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get_task_struct(pos);
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out:
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