On Fri, Mar 09, 2007 at 04:56:32PM +1100, Rusty Russell wrote: > __builtin_types_compatible_p() has been around since gcc 2.95, and we > don't use it anywhere. This patch quietly fixes that. > > Signed-off-by: Rusty Russell <[EMAIL PROTECTED]> > > diff -r f0ff8138f993 include/linux/kernel.h > --- a/include/linux/kernel.h Fri Mar 09 16:40:25 2007 +1100 > +++ b/include/linux/kernel.h Fri Mar 09 16:44:04 2007 +1100 > @@ -35,7 +35,9 @@ extern const char linux_proc_banner[]; > #define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1) > #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask)) > > -#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) > +#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) > \ > + + sizeof(typeof(int[1 - 2*!!__builtin_types_compatible_p(typeof(arr), \ > + typeof(&arr[0]))]))*0)
This needs a comment explaning why we're doing this, and maybe a little explanation of the combination of gcc magic and C trickery used to implement it to the brave non-uberhacker people trying to understand linux headers. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
