Re: [LSF/MM TOPIC] Fixing large block devices on 32 bit

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On 01/31/2014 04:25 PM, Kirill A. Shutemov wrote:
>> > I think all we have to do is set a low bit in page->mapping
> It's already in use to say page->mapping is anon_vma. ;)

I weasel-worded that by not saying *THE* low bit. ;)

We find *some* discriminator whether it be a page flag or an actual bit
in page->mapping, or a magic value that doesn't collide with the
existing PAGE_MAPPING_* flags.

Poor 'struct page'.  It's the doormat of data structures.
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