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Add __diagused

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This can be used for variables which are only used with either
INVARIANTS or WITNESS. Without any annotation they run into dead store
warnings from cc --analyze and always annotating with __unused may hide
bad vars when it should not.

Reviewed by:	kib, markj
Sponsored by:	Rubicon Communications, LLC ("Netgate")
Differential Revision:	https://reviews.freebsd.org/D31185

(cherry picked from commit b9296725cf)
This commit is contained in:
Mateusz Guzik 2021-07-15 14:01:02 +00:00
parent 6af8350df6
commit bc28e9596c
1 changed files with 7 additions and 0 deletions
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7
sys/sys/systm.h
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@ -625,6 +625,13 @@ void _gone_in_dev(device_t dev, int major, const char *msg);
#endif
#define gone_in(major, msg) __gone_ok(major, msg) _gone_in(major, msg)
#define gone_in_dev(dev, major, msg) __gone_ok(major, msg) _gone_in_dev(dev, major, msg)
#if defined(INVARIANTS) || defined(WITNESS)
#define __diagused
#else
#define __diagused __unused
#endif
#endif /* _KERNEL */
__NULLABILITY_PRAGMA_POP