Messages in this thread | | | Date | Mon, 3 Mar 2003 13:35:39 -0800 | From | Andrew Morton <> | Subject | Re: [PATCH 2.5.63] Teach page_mapped about the anon flag |
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Dave McCracken <dmccr@us.ibm.com> wrote: > > > --On Monday, March 03, 2003 13:12:10 -0800 Andrew Morton <akpm@digeo.com> > wrote: > > > It is. All callers which need to be 100% accurate are under > > pte_chain_lock(). > > Hmm, good point. Some places may not need perfect accuracy. Also, if it > gives a false positive it means someone else is doing an atomic op on it, > so it's likely to be in transition to/from true anyway. > > Ok, you've convinced me. Please ignore the patch. I'll hang onto it in > case we get proved wrong at some point.
We do need a patch I think. page_mapped() is still assuming that an all-bits-zero atomic_t corresponds to a zero-value atomic_t.
This does appear to be true for all supported architectures, but it's a bit grubby.
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