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Add __diagused

Authored by mjg on Wed, Jul 14, 11:52 PM.



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 blindly annotating with __unused may hide bad vars when it should not.

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R10 FreeBSD src repository
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mjg requested review of this revision.Wed, Jul 14, 11:52 PM
mjg created this revision.

The added macro is affected by symbols from the user namespace. This is actually a feature for kernel compilation environment. It should be put e.g. into sys/systm.h, not into the common header that must be usable in all environments. And in sys/systm.h, it should be under #ifdef _KERNEL.

After the move to kernel-only, there might be an issue if any code that is shared between kernel and userspace, starts using __diagused, but lets handle this when it become a real issue.

  • move to systm.h and hide under _KERNEL
This revision is now accepted and ready to land.Thu, Jul 15, 1:32 PM
This revision was automatically updated to reflect the committed changes.