Re: [PATCH 16/16] fix handling of integer constant expressions

On Sun, Jun 24, 2007 at 08:07:10PM +0200, Arnd Bergmann wrote:
One minor issue though:
While BUILD_BUG_ON and a few other macros in linux/kernel.h are currently
exported to user space, I would think that they should really be hidden
in #ifdef __KERNEL__, which means that we also need something like

#ifdef __KERNEL__
#define _IOC_TYPECHECK(t) \
(sizeof(t) + BUILD_BUG_ON_ZERO(sizeof(t) == sizeof(t[1]) && \
sizeof(t) < (1 << _IOC_SIZEBITS)))
#else
#define _IOC_TYPECHECK(t) sizeof(t)
#endif

Point, but then we might want to export the damn thing in properly
named version (i.e. put it into __.... reserved namespace). It
doesn't depend on anything kernel-specific...

FWIW, the current version suffers from similar problem - it's outside
of __KERNEL__ in userland-exported header and it can lead to breakage
when included in build by something other than gcc...
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