Messages in this thread | | | Date | Wed, 14 Jan 2009 19:33:32 -0800 (PST) | From | Linus Torvalds <> | 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
| |