From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Hugh Dickins <hugh@veritas.com>, Andrew Morton <akpm@osdl.org>,
linux-mm@kvack.org, paulus@samba.org, davem@davemloft.net
Subject: Re: vDSO vs. mm : problems with ppc vdso
Date: Wed, 01 Mar 2006 13:26:59 +1100 [thread overview]
Message-ID: <1141180019.4157.12.camel@localhost.localdomain> (raw)
In-Reply-To: <440505D0.2030802@yahoo.com.au>
On Wed, 2006-03-01 at 13:24 +1100, Nick Piggin wrote:
> Hugh Dickins wrote:
> > On Tue, 28 Feb 2006, Nick Piggin wrote:
> >
> >>You should be OK. VM_RESERVED itself is something of an anachronism
> >>these days. If you're not getting your page from the page allocator
> >>then you'll want to make sure each of their count, and mapcount is
> >>reset before allowing them to be mapped.
> >
> >
> > Yes, it's fine that VM_RESERVED isn't set on it.
> > But I don't understand your remarks about count and mapcount at all:
> > perhaps you meant to say something else?
> >
>
> Yes, count should be elevated.
>
> mapcount should be reset, to avoid the bug in page_remove_rmap.
Can you be more explicit ?
Cheers,
Ben.
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next prev parent reply other threads:[~2006-03-01 2:26 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-28 5:39 vDSO vs. mm : problems with ppc vdso Benjamin Herrenschmidt
2006-02-28 5:54 ` Andrew Morton
2006-02-28 6:08 ` Benjamin Herrenschmidt
2006-02-28 6:20 ` Andrew Morton
2006-02-28 6:30 ` Benjamin Herrenschmidt
2006-02-28 6:47 ` Andrew Morton
2006-02-28 7:36 ` Benjamin Herrenschmidt
2006-02-28 12:13 ` Hugh Dickins
2006-02-28 10:24 ` Nick Piggin
2006-02-28 12:32 ` Hugh Dickins
2006-02-28 17:55 ` Benjamin Herrenschmidt
2006-03-01 2:24 ` Nick Piggin
2006-03-01 2:26 ` Benjamin Herrenschmidt [this message]
2006-03-01 2:38 ` Nick Piggin
2006-02-28 6:27 ` [PATCH] Add mm->task_size and fix powerpc vdso Benjamin Herrenschmidt
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