linux-kernel - Re: [PATCH] procfs task exe symlink

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Message-ID: <20080426162458.GJ5882@ZenIV.linux.org.uk>
Date:	Sat, 26 Apr 2008 17:24:58 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Matt Helsley <matthltc@...ibm.com>, linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...sign.ru>,
	David Howells <dhowells@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Christoph Hellwig <chellwig@...ibm.com>,
	Hugh Dickins <hugh@...itas.com>
Subject: Re: [PATCH] procfs task exe symlink

On Sat, Apr 26, 2008 at 09:19:30AM -0700, Andrew Morton wrote:

> +	set_mm_exe_file(bprm->mm, bprm->file);
> +
>  	/*
>  	 * Release all of the old mmap stuff
>  	 */
> 
> However I'd ask that you conform that this is OK.  If set_mm_exe_file() is
> independent of unshare_files() then we're OK.  If however there is some
> ordering dependency then we'll need to confirm that the present ordering of the
> unshare_files() and set_mm_exe_file() is correct.

No, that's fine (unshare_files() had to go up for a lot of reasons, one
of them being that it can fail and de_thread() called just above is
very much irreversible).
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