notifier: change notifier_from_errno(0) to return NOTIFY_OK
This changes notifier_from_errno(0) to be NOTIFY_OK instead of NOTIFY_STOP_MASK | NOTIFY_OK. Currently, the notifiers which return encapsulated errno value have to do something like this: err = do_something(); // returns -errno if (err) return notifier_from_errno(err); else return NOTIFY_OK; This change makes the above code simple: err = do_something(); // returns -errno return return notifier_from_errno(err); Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -164,7 +164,10 @@ extern int __srcu_notifier_call_chain(struct srcu_notifier_head *nh,
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/* Encapsulate (negative) errno value (in particular, NOTIFY_BAD <=> EPERM). */
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static inline int notifier_from_errno(int err)
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{
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return NOTIFY_STOP_MASK | (NOTIFY_OK - err);
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if (err)
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return NOTIFY_STOP_MASK | (NOTIFY_OK - err);
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return NOTIFY_OK;
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}
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/* Restore (negative) errno value from notify return value. */
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