Okay, I've gotten really, really sick of the fact that almost any
networking driver or STREAMS code has to disable the E_PTRDIFF_OVERFLOW
lint warning.
The reason is that all the calls to those system macros trigger a lint
warning. If it weren't for the warnings, those macros turn out to be
really useful. I never worried about them, but now they are an official
part of the DDI, it seems like we ought not to be making lint complain
when folks use our macros/functions in the documented ways.
I'm thinking of basically converting the macros so that they mp->b_rptr
and mp->b_wptr and such pointers are first cast to a uintptr_t, before
the math is performed on them. E.g:
#define MBLKL(mp) ((uintptr_t)(mp)->b_wptr - (uintptr_t)(mp)->b_rptr)
Anyone have any thoughts about this? If nobody objects, I'll file a bug
and probably submit an RTI next week. (I wouldn't mind having a
volunteer for codereview, either! :-)
-- Garrett
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