From: Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx> Date: Wed, 2 Feb 2011 21:45:22 +0000 > On Wed, Feb 02, 2011 at 01:38:31PM -0800, David Miller wrote: >> 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 involves this problematical cast from a packed struct pointer to > an unsigned long pointer, which according to the C standard and GCC > folk is undefined. It's alignment may be undefined, but it's size definitely is well defined and that's what matters here. > Practice over the last 15 years on ARM has also shown that this is not > necessary. Sorry oh big super man, little ole' me is only a kernel newbie. -- 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
