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Message-ID: <1260365958.5489.546.camel@laptop> Date: Wed, 09 Dec 2009 14:39:18 +0100 From: Peter Zijlstra <peterz@...radead.org> To: Al Viro <viro@...IV.linux.org.uk> Cc: Hugh Dickins <hugh.dickins@...cali.co.uk>, David Miller <davem@...emloft.net>, Ollie Wild <aaw@...gle.com>, Rik van Riel <riel@...hat.com>, viro@....linux.org.uk, linux-arch@...r.kernel.org, torvalds@...ux-foundation.org, akpm@...ux-foundation.org, linux-kernel@...r.kernel.org Subject: Re: [RFC][PATCHSET] mremap/mmap mess On Wed, 2009-12-09 at 13:24 +0000, Al Viro wrote: > > That is, IIRC the problem is that you need to have the argc/env in place > > for the binfmt engine thing, and need to have ran the binfmt engine > > thing before you know the personality. > > > > As to your idea, if that were feasible we could do without the copy and > > simply steal the pages directly from the old mm. > > *raised brows* > Old mm may bloody well be still shared, so I'd be vary of trying that - > there's a lot of nasty surprises we could get on that way. Good point, but I think we might be able to do the copy from old to new in flush_old_exec() if we can get the binfmt things to pass the right address along (or set it in the brpm struct). It looks like it has clue about personality at that point. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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