linux-kernel - [PATCH 1/2] staging: zcache: fix ppc64 and other arches where PAGE

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Date:	Wed, 23 Jan 2013 13:46:30 -0800
From:	Dan Magenheimer <dan.magenheimer@...cle.com>
To:	devel@...uxdriverproject.org, linux-kernel@...r.kernel.org,
	gregkh@...uxfoundation.org, linux-mm@...ck.org, ngupta@...are.org,
	konrad.wilk@...cle.com, sjenning@...ux.vnet.ibm.com,
	minchan@...nel.org, dan.magenheimer@...cle.com
Subject: [PATCH 1/2] staging: zcache: fix ppc64 and other arches where PAGE_SIZE!=4K

Replace raw constant 12 with PAGE_SHIFT to fix non-x86 arches and
provoke build failure if PAGE_SHIFT is too big

Signed-off-by: Dan Magenheimer <dan.magenheimer@...cle.com>
---
 drivers/staging/zcache/zbud.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/zcache/zbud.c b/drivers/staging/zcache/zbud.c
index a7c4361..6835fab 100644
--- a/drivers/staging/zcache/zbud.c
+++ b/drivers/staging/zcache/zbud.c
@@ -103,8 +103,8 @@ struct zbudpage {
 		struct {
 			unsigned long space_for_flags;
 			struct {
-				unsigned zbud0_size:12;
-				unsigned zbud1_size:12;
+				unsigned zbud0_size: PAGE_SHIFT;
+				unsigned zbud1_size: PAGE_SHIFT;
 				unsigned unevictable:2;
 			};
 			struct list_head budlist;
@@ -112,6 +112,9 @@ struct zbudpage {
 		};
 	};
 };
+#if (PAGE_SHIFT * 2) + 2 > BITS_PER_LONG
+#error "zbud won't work for this arch, PAGE_SIZE is too large"
+#endif
 
 struct zbudref {
 	union {
-- 
1.7.1

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