linux-kernel - Re: [patch for-3.7] mm, mempolicy: fix printing stack contents in numa

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Message-ID: <CA+55aFzoxMYLXdBvdMYTy_LhrVuU233qh1eDyAda5otUTHojPA@mail.gmail.com>
Date:	Thu, 25 Oct 2012 16:09:48 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	David Rientjes <rientjes@...gle.com>,
	Sasha Levin <levinsasha928@...il.com>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Dave Jones <davej@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	bhutchings@...arflare.com,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Hugh Dickins <hughd@...gle.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [patch for-3.7] mm, mempolicy: fix printing stack contents in numa_maps

On Thu, Oct 25, 2012 at 7:39 AM, Peter Zijlstra <peterz@...radead.org> wrote:
>
> So I think the below should work, we hold the spinlock over both rb-tree
> modification as sp free, this makes mpol_shared_policy_lookup() which
> returns the policy with an incremented refcount work with just the
> spinlock.
>
> Comments?

Looks reasonable, if annoyingly complex for something that shouldn't
be important enough for this. Oh well.

However, please check me on this: the need for this is only for
linux-next right now, correct? All the current users in my tree are ok
with just the mutex, no?

            Linus
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