linux-kernel - Re: [PATCH, RFC, v2] shmat: introduce flag SHM_MAP

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Message-ID: <20081007151049.GL20740@one.firstfloor.org>
Date:	Tue, 7 Oct 2008 17:10:49 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Hugh Dickins <hugh@...itas.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Ingo Molnar <mingo@...hat.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH, RFC, v2] shmat: introduce flag SHM_MAP_HINT

On Tue, Oct 07, 2008 at 03:38:44PM +0100, Hugh Dickins wrote:
> On Tue, 7 Oct 2008, Andi Kleen wrote:
> > > I want say that we shouldn't do this check if shmaddr is a search hint.
> > > I'm not sure that check is unneeded if shmadd is the exact address.
> > 
> > mmap should fail in this case because it does the same check for 
> > MAP_FIXED. Obviously it cannot succeed when there is already something
> > else there.
> 
> I'm not really following this, so forgive me if I'm reading you
> out of context, but I think you're wrong on that...

You're right, Hugh, I was confused here. The earlier check
is indeed needed and cannot be dropped. Thanks for the reality check.

-Andi
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