linux-kernel - [PATCH] drm/ttm: remove padding from ttm_ref

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Date:	Tue, 26 Jan 2010 17:10:48 +0000
From:	Richard Kennedy <richard@....demon.co.uk>
To:	David Airlie <airlied@...ux.ie>,
	Thomas Hellstrom <thellstrom@...are.com>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	dri-devel@...ts.sourceforge.net
Subject: [PATCH] drm/ttm: remove padding from ttm_ref_object on 64bit builds

Re-order structure ttm_ref_object to remove 8 bytes of alignment padding
on 64 bit builds, so shrinking its size from 72 to 64 bytes allowing it
to fit into a smaller slab.

Signed-off-by: Richard Kennedy <richard@....demon.co.uk>
----
patch against 2.6.33-rc5
compiled & tested on x86_64 AMDX2 and nouveau 
regards
Richard


diff --git a/drivers/gpu/drm/ttm/ttm_object.c b/drivers/gpu/drm/ttm/ttm_object.c
index 1099aba..75e9d6f 100644
--- a/drivers/gpu/drm/ttm/ttm_object.c
+++ b/drivers/gpu/drm/ttm/ttm_object.c
@@ -109,8 +109,8 @@ struct ttm_ref_object {
 	struct drm_hash_item hash;
 	struct list_head head;
 	struct kref kref;
-	struct ttm_base_object *obj;
 	enum ttm_ref_type ref_type;
+	struct ttm_base_object *obj;
 	struct ttm_object_file *tfile;
 };
 


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