linux-kernel - Re: [PATCH 2/2] mm: blk-mq: uses page->list incorrectly

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Message-ID: <alpine.DEB.2.02.1312111447280.7354@chino.kir.corp.google.com>
Date:	Wed, 11 Dec 2013 14:47:41 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Dave Hansen <dave@...1.net>
cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org, cl@...two.org,
	kirill.shutemov@...ux.intel.com, Andi Kleen <ak@...ux.intel.com>,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 2/2] mm: blk-mq: uses page->list incorrectly

On Wed, 11 Dec 2013, Dave Hansen wrote:

> 
> From: Dave Hansen <dave.hansen@...ux.intel.com>
> 
> 'struct page' has two list_head fields: 'lru' and 'list'.
> Conveniently, they are unioned together.  This means that code
> can use them interchangably, which gets horribly confusing.
> 
> The blk-mq made the logical decision to try to use page->list.
> But, that field was actually introduced just for the slub code.
> ->lru is the right field to use outside of slab/slub.
> 
> Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>

Acked-by: David Rientjes <rientjes@...gle.com>
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