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Date: Mon, 11 Dec 2006 17:29:07 -0800 From: Pete Zaitcev <zaitcev@...hat.com> To: Matt Helsley <matthltc@...ibm.com> Cc: Erik Jacobson <erikj@....com>, guillaume.thouvenin@...l.net, linux-kernel@...r.kernel.org, zaitcev@...hat.com Subject: Re: [PATCH] connector: Some fixes for ia64 unaligned access errors On Mon, 11 Dec 2006 15:52:47 -0800, Matt Helsley <matthltc@...ibm.com> wrote: > I'm shocked memcpy() introduces 8-byte stores that violate architecture > alignment rules. Is there any chance this a bug in ia64's memcpy() > implementation? I've tried to read it but since I'm not familiar with > ia64 asm I can't make out significant parts of it in > arch/ia64/lib/memcpy.S. The arch/ia64/lib/memcpy.S is probably fine, it must be gcc doing an inline substitution of a well-known function. A commenter on my blog mentioned seeing the same thing in the past. (http://zaitcev.livejournal.com/107185.html?thread=128945#t128945) It's possible that applying (void *) cast to the first argument of memcpy would disrupt this optimization. But since we have a well understood patch by Erik, which only adds a penalty of 32 bytes of stack waste and 32 bytes of memcpy, I thought it best not to bother with heaping workarounds. -- Pete - 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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