On Mon, Mar 03, 2014 at 03:34:43PM -0800, Linus Torvalds wrote: > On Mon, Mar 3, 2014 at 3:28 PM, Al Viro <[email protected]> wrote: > > > > Umm... I would be very surprised if that worked well. You have just > > forced fdget() to comply to the ABI. And unless that has such structs > > returned in register pairs, there's no way for compiler to do about > > that. > > Register pairs are very much a common return model. > > And we've relied on that before. For example, 64-bit pte's on x86-32 > very much does that whole thing with the "pte_t" union. > > So you can now commence being surprised. > > (Side note: I think sparc or something doesn't support it, and may > return things in memory. I can't really seem to find it in myself to > care)
sparc64 actually does support that. So does amd64, and, with explicit flag, i386. No other more or less general purpose architecture does. Not ppc. Not mips. Not arm. I think that some of those are worth caring about... -- 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/
