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| author | David Woodhouse <dwmw2@infradead.org> | 2007-08-01 11:23:57 +0100 |
|---|---|---|
| committer | David Woodhouse <dwmw2@infradead.org> | 2007-08-01 11:23:57 +0100 |
| commit | 440fdb53b4ae58602711b5b8c3a139ace2404dbb (patch) | |
| tree | c6fb88d6ad537ec53aeecadc75a61ab6147d4c9c /include/linux/notifier.h | |
| parent | 8b2b403ce0f1a816b7a6a4f47c8798003b26c07a (diff) | |
| parent | 8d4fbcfbe0a4bfc73e7f0297c59ae514e1f1436f (diff) | |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'include/linux/notifier.h')
| -rw-r--r-- | include/linux/notifier.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/notifier.h b/include/linux/notifier.h index be3f2bb6fcf..fad7ff17e46 100644 --- a/include/linux/notifier.h +++ b/include/linux/notifier.h @@ -157,6 +157,19 @@ extern int __srcu_notifier_call_chain(struct srcu_notifier_head *nh, */ #define NOTIFY_STOP (NOTIFY_OK|NOTIFY_STOP_MASK) +/* Encapsulate (negative) errno value (in particular, NOTIFY_BAD <=> EPERM). */ +static inline int notifier_from_errno(int err) +{ + return NOTIFY_STOP_MASK | (NOTIFY_OK - err); +} + +/* Restore (negative) errno value from notify return value. */ +static inline int notifier_to_errno(int ret) +{ + ret &= ~NOTIFY_STOP_MASK; + return ret > NOTIFY_OK ? NOTIFY_OK - ret : 0; +} + /* * Declared notifiers so far. I can imagine quite a few more chains * over time (eg laptop power reset chains, reboot chain (to clean |