From: Vince Bridgers > On Mon, Mar 10, 2014 at 7:40 PM, Stephen Hemminger > <stephen@xxxxxxxxxxxxxxxxxx> wrote: > > On Mon, 10 Mar 2014 18:14:36 -0500 > > Vince Bridgers <vbridgers2013@xxxxxxxxx> wrote: > > > >> + > >> + buf[0] = (u64) ioread32(&mac->frames_transmitted_ok); > > > > The cast to u64 is not really necessary, C will do it for you. > > You do need the cast to do the shift for the 64 bit values. > > Ok, understood. I generally add the cast so it's explicit, but I'll modify. The problem is that the cast will allow incorrect code to compile. eg, you might have a pointer, not an integer. Many years ago I got caught out by a #define like the following: #define foo(ptr) { int s = splhi(); do_foo((void *)ptr); splx(s); } My code crashed because I'd called foo(s). Now that #define is broken in so many ways, but the (void *) cast stopped the compiler erroring one of them. David -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html