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    SubjectRe: [patch 3/4] mm: bootmem: drop superfluous range check when freeing pages in bulk
    On Tue, Dec 13, 2011 at 04:28:43PM +0100, Uwe Kleine-König wrote:
    > Hello Johannes,
    > On Tue, Dec 13, 2011 at 02:58:30PM +0100, Johannes Weiner wrote:
    > > The area node_bootmem_map represents is aligned to BITS_PER_LONG, and
    > > all bits in any aligned word of that map valid. When the represented
    > > area extends beyond the end of the node, the non-existant pages will
    > > be marked as reserved.
    > >
    > > As a result, when freeing a page block, doing an explicit range check
    > > for whether that block is within the node's range is redundant as the
    > > bitmap is consulted anyway to see whether all pages in the block are
    > > unreserved.
    > >
    > > Signed-off-by: Johannes Weiner <>
    > I suggest to drop my patch then and add something like
    > Reported-by: $me
    > to this one instead.

    Your patch is a real and obvious fix, while mine is just a cleanup but
    has more obscure dependencies on how the bitmap is managed.

    If you don't mind, I would prefer to keep them as separate changes.

    > Other than that I will give your series a spin on my ARM machine later
    > today.

    Thanks a lot!
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