Re: [PATCH][COMPAT] compat_sys_fcntl{,64} 1/9 Generic part

From: Linus Torvalds (torvalds@transmeta.com)
Date: Wed Mar 12 2003 - 00:26:02 EST


On Wed, 12 Mar 2003, Stephen Rothwell wrote:
>
> > Make the code _look_ good. Not look like SOMEBODY WHO CANNOT TYPE WITHOUT
> > THE SHIFT KEY. Make the thing take properly typed arguments, instead of
> > casting stuff two ways and backwards inside macros.
>
> you mean like this?

Yes, this looks much more sane. If you _really_ want to be anal about
typechecking (and also checking that nobody can possibly use a user
pointer incorrectly), you make

        typedef struct {
                unsigned int val;
        } compat_uptr_t;

and then use

        static inline void *compat_ptr(compat_uptr_t uptr)
        {
                return (void *)uptr.val;
        }

which should still result in readable code.

                Linus

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