From: Huang Shijie <shijie8@gmail.com>
To: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Cc: akpm@linux-foundation.org, linux-mm@kvack.org
Subject: Re: [PATCH] remove unused line for mmap_region()
Date: Wed, 24 Jun 2009 11:16:15 +0800 [thread overview]
Message-ID: <4A419A7F.8050604@gmail.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0906231155180.6167@sister.anvils>
> I can't name a list of drivers offhand, no (but note VM_PFNMAP areas
> have a particular use for vm_pgoff, so all those drivers are likely
> to be on the list). May I please leave that investigation to you?
>
>
ok.
> What I expect you to find in the end is that every driver which does
> meddle with pgoff in its ->mmap, also has some other characteristic
> (e.g. sets VM_IO or VM_DONTEXPAND or VM_RESERVED or VM_PFNMAP, or
> even some other flag which the new vm_flags wouldn't have set),
> which will prevent its vmas being merged anyway.
>
>
Unfortunately,the driver's -->mmap is called below the vma_merge(),
so even if the driver sets the VM_SPECIAL flag, it does not prevent the
vmas being merged actually.
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next prev parent reply other threads:[~2009-06-24 3:18 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-21 14:43 [PATCH] remove unused line for mmap_region() Huang Shijie
2009-06-21 18:30 ` Hugh Dickins
2009-06-22 3:50 ` Huang Shijie
2009-06-23 11:14 ` Hugh Dickins
2009-06-24 3:16 ` Huang Shijie [this message]
2009-06-24 4:22 ` Hugh Dickins
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