Messages in this thread | | | Date | Sun, 13 May 2007 05:39:03 +0100 (BST) | From | Hugh Dickins <> | Subject | Re: [rfc] optimise unlock_page |
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On Sun, 13 May 2007, Nick Piggin wrote: > On Fri, May 11, 2007 at 02:15:03PM +0100, Hugh Dickins wrote: > > > Hmm, well, I think that's fairly horrid, and would it even be > > guaranteed to work on all architectures? Playing with one char > > of an unsigned long in one way, while playing with the whole of > > the unsigned long in another way (bitops) sounds very dodgy to me. > > Of course not, but they can just use a regular atomic word sized > bitop. The problem with i386 is that its atomic ops also imply > memory barriers that you obviously don't need on unlock.
But is it even a valid procedure on i386?
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