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

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Message-Id: <20131211223632.8B2DFD41@viggo.jf.intel.com>
Date:	Wed, 11 Dec 2013 14:36:32 -0800
From:	Dave Hansen <dave@...1.net>
To:	linux-kernel@...r.kernel.org
Cc:	linux-mm@...ck.org, cl@...two.org, kirill.shutemov@...ux.intel.com,
	Andi Kleen <ak@...ux.intel.com>, akpm@...ux-foundation.org,
	Dave Hansen <dave@...1.net>
Subject: [PATCH 2/2] mm: blk-mq: uses page->list incorrectly


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>
---

 linux.git-davehans/block/blk-mq.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff -puN block/blk-mq.c~blk-mq-uses-page-list-incorrectly block/blk-mq.c
--- linux.git/block/blk-mq.c~blk-mq-uses-page-list-incorrectly	2013-12-11 14:34:51.735196799 -0800
+++ linux.git-davehans/block/blk-mq.c	2013-12-11 14:34:51.739196977 -0800
@@ -1087,8 +1087,8 @@ static void blk_mq_free_rq_map(struct bl
 	struct page *page;
 
 	while (!list_empty(&hctx->page_list)) {
-		page = list_first_entry(&hctx->page_list, struct page, list);
-		list_del_init(&page->list);
+		page = list_first_entry(&hctx->page_list, struct page, lru);
+		list_del_init(&page->lru);
 		__free_pages(page, page->private);
 	}
 
@@ -1152,7 +1152,7 @@ static int blk_mq_init_rq_map(struct blk
 			break;
 
 		page->private = this_order;
-		list_add_tail(&page->list, &hctx->page_list);
+		list_add_tail(&page->lru, &hctx->page_list);
 
 		p = page_address(page);
 		entries_per_page = order_to_size(this_order) / rq_size;
_
--
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