From owner-freebsd-current  Thu Sep  6 18:46:41 2001
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Date: Thu, 6 Sep 2001 19:14:04 -0700 (PDT)
From: Julian Elischer <julian@elischer.org>
To: John Baldwin <jhb@FreeBSD.org>
Cc: Julian Elischer <julian@vicor-nb.com>, current@FreeBSD.org
Subject: RE: RFC: hack volatile bzero and bcopy
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Actually I just discoverd that you can do:

int function (volatile const *);

(I guess you say you will not writ eto it, but that it may change of its
own volition at times)

anyhow setting this in bcopy would remove a heck of a lot of warnings
in the kernel.

On Thu, 6 Sep 2001, John Baldwin wrote:

> 
> On 07-Sep-01 Julian Elischer wrote:
> > 
> > Here is a hack to remove the 20 or so warning messages from if_ie.c
> > 
> > Most of them are due to the supply of volatile pointers to bcopy and
> > bzero.
> > 
> > I do the following to produce macros that call bzero and bcopy, but
> > don't produce 
> > warning messages when called with volatile arguments.
> > 
> > 
> > typedef void Xcopy( void volatile *, void volatile *, int);
> >#define VBCOPY(A,B,L) (*(Xcopy *)&bcopy)((A),(B),(L))
> > typedef void Xzero( void volatile *, int);
> >#define VBZERO(A,L) (*(Xzero *)&bzero)((A),(L))
> 
> sys/cdef.h already has some rather general purpose macros for thsi sort of
> thing in the form of __DEVOLATILE(), __DECONST(), and __DEQUALIFY().

thanks,
I'll go look at them.


> 
> -- 
> 
> John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/
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> "Power Users Use the Power to Serve!"  -  http://www.FreeBSD.org/
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