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Date: Wed, 02 Feb 2011 15:23:50 -0800 (PST) From: David Miller <davem@...emloft.net> To: mans@...sr.com Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-usb@...r.kernel.org, gcc@....gnu.org Subject: Re: ARM unaligned MMIO access with attribute((packed)) From: Måns Rullgård <mans@...sr.com> Date: Wed, 02 Feb 2011 23:08:01 +0000 > David Miller <davem@...emloft.net> writes: > >> From: Russell King - ARM Linux <linux@....linux.org.uk> >> 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-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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