Messages in this thread | | | Date | Sat, 4 Oct 2003 00:42:46 -0700 | From | Andrew Morton <> | Subject | Re: mlockall and mmap of IO devices don't mix |
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Andi Kleen <ak@muc.de> wrote: > > Joe Korty <joe.korty@ccur.com> writes: > > > > > I do not believe that the above constitutes a correct fix. The > > problem is that follow_pages() is fundamentally not able to handle a > > mapping which does not have a 'struct page' backing it up, and a > > mapping to IO memory by definition has no 'struct page' structure to > > back it up. > > The 2.4 vm scanner handles this by always checking VALID_PAGE(). >
VALID_PAGE got nuked.
It still exists in vestigial form in some architectures, but x86 does not implement it and core kernel does not use it.
It is not a trivial thing to do now we no longer have a single mem_map[]. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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