Re: [PATCH 00/16] mm: prepare for converting vm->vm_flags to 64-bit

[Konstantin Khlebnikov]

Benjamin Herrenschmidt wrote:
> On Thu, 2012-03-22 at 14:39 +0900, Minchan Kim wrote:
> > I think we can also unify VM_MAPPED_COPY(nommu) and VM_SAO(powerpc)
> > with one VM_ARCH_1
> > Okay. After this series is merged, let's try to remove flags we can
> > do. Then, other guys
> > might suggest another ideas.
>
> Agreed. I would like more VM_ARCH while at it :-)

Currently I see here four architecture-specific flags =)

            VM_ARCH_1       VM_ARCH_2       VM_ARCH_3       VM_ARCH_4
    x86     VM_NOHUGEPAGE   VM_HUGEPAGE     -               VM_PFN_AT_MMAP
    powerpc -               -               VM_SAO          -
    parisc  VM_GROWSUP      -               -               -
    ia64    VM_GROWSUP      -               -               -
    nommu   -               VM_MAPPED_COPY  -               -

Obviously we can combine VM_PFN_AT_MMAP, VM_SAO, VM_GROWSUP and VM_MAPPED_COPY into one.
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