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

Konstantin Khlebnikov
2012-03-24T14:46:52Z

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.