linux-kernel - Re: [PATCH 00/16] mm: prepare for converting vm->vm

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Date:	Sat, 24 Mar 2012 18:46:46 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC:	Minchan Kim <minchan@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>
Subject: Re: [PATCH 00/16] mm: prepare for converting vm->vm_flags to 64-bit

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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