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Message-ID: <alpine.LFD.2.00.0901141932290.6528@localhost.localdomain> Date: Wed, 14 Jan 2009 19:33:32 -0800 (PST) From: Linus Torvalds <torvalds@...ux-foundation.org> To: Rusty Russell <rusty@...tcorp.com.au> cc: Christoph Lameter <cl@...ux-foundation.org>, Ingo Molnar <mingo@...e.hu>, akpm@...ux-foundation.org, andi@...stfloor.org, ak@...ux.intel.com, rth@...ddle.net, sfr@...b.auug.org.au, travis@....com, linux-kernel@...r.kernel.org Subject: Re: [patch 2/8] compiler-gcc.h: add more comments to RELOC_HIDE On Thu, 15 Jan 2009, Rusty Russell wrote: > On Tuesday 13 January 2009 04:03:49 Christoph Lameter wrote: > > But that is not what is occurring. We do not do &var + LARGE_OFFSET. > > Instead one does > > > > ((void *)&var) + LARGE_OFFSET > > > > or > > ((unsigned long)&var) + LARGE_OFFSET > > > > The cast should cause the C compiler to drop all assumptions about size. > > No, and that's the point. Sorry, at this point you need to talk to a gcc expert. As I have said, I did and I believe what he told me. Yeah, I personally believe in the "should cause the C compiler" part, but gcc doesn't work that way. It will remember where the value came from, even when the pointer has been cast to something else. Linus -- 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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