From: Måns Rullgård <mans@xxxxxxxxx> Date: Wed, 02 Feb 2011 23:08:01 +0000 > David Miller <davem@xxxxxxxxxxxxx> writes: > >> From: Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx> >> Date: Wed, 2 Feb 2011 16:37:02 +0000 >> >>> 1. there's no way to tell GCC that the inline assembly is a load >>> instruction and therefore it needs to schedule the following >>> instructions appropriately. >> >> Just add a dummy '"m" (pointer)' asm input argument to the inline asm >> statement. Just make sure "typeof(pointer)" has a size matching the >> size of the load your are performing. > > That should be "m"(*pointer). Right, thanks for the correction. >> But you really need that memory clobber there whether you like it or >> not, see above. > > I don't know of any device where the side-effects are not explicitly > indicated by other means in the code triggering them, so it probably > is safe without the clobber as Russel says. You're probably right. -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
