linux-kernel - Re: [RFC][PATCH] HWPOISON: remove the unsafe __set_page

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Message-ID: <20090928011943.GB1656@one.firstfloor.org>
Date:	Mon, 28 Sep 2009 03:19:43 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Andi Kleen <andi@...stfloor.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH] HWPOISON: remove the unsafe __set_page_locked()

> There is no real rush AFAIKS to fix this one single pagecache site
> while we have problems with slab allocators and all other unaudited
> places that nonatomically modify page flags with an elevated

hwpoison ignores slab pages.

> page reference ... just mark HWPOISON as broken for the moment, or
> cut it down to do something much simpler I guess?

Erm no. These cases are *EXTREMLY* unlikely to hit.

I'll look into exploiting the ordering of the mapping assignment.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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