linux-kernel - [PATCH 5/14] drm/ttm: use shmem_read_mapping

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Date:	Sun, 5 Jun 2011 21:29:09 -0700 (PDT)
From:	Hugh Dickins <hughd@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Christoph Hellwig <hch@...radead.org>,
	Thomas Hellstrom <thellstrom@...are.com>,
	Dave Airlie <airlied@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [PATCH 5/14] drm/ttm: use shmem_read_mapping_page

Soon tmpfs will stop supporting ->readpage and read_mapping_page():
once "tmpfs: add shmem_read_mapping_page_gfp" has been applied,
this patch can be applied to ease the transition.

ttm_tt_swapin() and ttm_tt_swapout() use shmem_read_mapping_page()
in place of read_mapping_page(), since their swap_space has been
created with shmem_file_setup().

Signed-off-by: Hugh Dickins <hughd@...gle.com>
Cc: Christoph Hellwig <hch@...radead.org>
Cc: Thomas Hellstrom <thellstrom@...are.com>
Cc: Dave Airlie <airlied@...hat.com>
---
 drivers/gpu/drm/ttm/ttm_tt.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- linux.orig/drivers/gpu/drm/ttm/ttm_tt.c	2011-05-18 21:06:34.000000000 -0700
+++ linux/drivers/gpu/drm/ttm/ttm_tt.c	2011-06-05 18:24:09.501854133 -0700
@@ -31,6 +31,7 @@
 #include <linux/sched.h>
 #include <linux/highmem.h>
 #include <linux/pagemap.h>
+#include <linux/shmem_fs.h>
 #include <linux/file.h>
 #include <linux/swap.h>
 #include <linux/slab.h>
@@ -484,7 +485,7 @@ static int ttm_tt_swapin(struct ttm_tt *
 	swap_space = swap_storage->f_path.dentry->d_inode->i_mapping;
 
 	for (i = 0; i < ttm->num_pages; ++i) {
-		from_page = read_mapping_page(swap_space, i, NULL);
+		from_page = shmem_read_mapping_page(swap_space, i);
 		if (IS_ERR(from_page)) {
 			ret = PTR_ERR(from_page);
 			goto out_err;
@@ -557,7 +558,7 @@ int ttm_tt_swapout(struct ttm_tt *ttm, s
 		from_page = ttm->pages[i];
 		if (unlikely(from_page == NULL))
 			continue;
-		to_page = read_mapping_page(swap_space, i, NULL);
+		to_page = shmem_read_mapping_page(swap_space, i);
 		if (unlikely(IS_ERR(to_page))) {
 			ret = PTR_ERR(to_page);
 			goto out_err;
--
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