linux-kernel - [PATCH 0/5] (Was: procfs: silence lockdep warning about read vs. exec seq

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Message-ID: <20140803211843.GA13330@redhat.com>
Date:	Sun, 3 Aug 2014 23:18:43 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	David Howells <dhowells@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Sasha Levin <levinsasha928@...il.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	"David S. Miller" <davem@...emloft.net>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH 0/5] (Was: procfs: silence lockdep warning about read vs.
	exec seq_file)

On 08/03, Oleg Nesterov wrote:
>
> The question is, why m_start() calls mm_access(). This is not even
> strictly correct if the task execs between m_stop() + m_start().
>
> Can't we do something like below? The patch is obviously horrible and
> incomplete, just to explain what I meant. Basically this is what
> proc_mem_operations does.

Absolutely untested, only for review.

What do you all think?

Sure, with this change you can't open (say) /proc/pid/maps, and read the
new mappings after exec. But hopefully this is fine? And again, this
matches /proc/pid/mem.

lock_trace() users need another fix.

Oleg.

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