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Date: Fri, 26 Dec 2003 07:45:40 -0800
From: "David O'Brien" <obrien@FreeBSD.org>
To: Doug Barton <DougB@dougbarton.net>
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Subject: Re: cvs commit: src/sys/sys _null.h
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On Wed, Dec 24, 2003 at 12:34:52PM -0800, Doug Barton wrote:
> >peter       2003/12/22 18:34:25 PST
> >  FreeBSD src repository
> >  Modified files:
> >    sys/sys              _null.h 
> >  Log:
> >  Don peril sensitive sunglasses and set NULL to an actual pointer type,
> >  but *only* for the kernel.  We can do this because the kernel is not a
> >  standard C application environment.  This would have stopped the recent
> >  mtx_* arg NULL/MTX_DEF mixups from going unnoticed for so long.
> >  Revision  Changes    Path
> >  1.3       +4 -0      src/sys/sys/_null.h
> 
> Is this worth a __FreeBSD_version bump?

Nope.  This isn't an ABI change.  Both "0" and "(void *)0" are valid NULL
definitions in ANSI-C.  Peter's change only makes us code correctly,
using "0" rather than "NULL" for int variables.  Most likely using "NULL"
with int variables is ANSI-C undefined behavior.