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| author | Andrea Righi <righi.andrea@gmail.com> | 2008-07-23 21:28:13 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-24 10:47:21 -0700 |
| commit | 27ac792ca0b0a1e7e65f20342260650516c95864 (patch) | |
| tree | 8e0bc93612da0803fe12303ccb75c837cd633c83 /drivers/video/omap | |
| parent | d92bc318547507a944a22e7ef936793dc0fe167f (diff) | |
| download | op-kernel-dev-27ac792ca0b0a1e7e65f20342260650516c95864.zip op-kernel-dev-27ac792ca0b0a1e7e65f20342260650516c95864.tar.gz | |
PAGE_ALIGN(): correctly handle 64-bit values on 32-bit architectures
On 32-bit architectures PAGE_ALIGN() truncates 64-bit values to the 32-bit
boundary. For example:
u64 val = PAGE_ALIGN(size);
always returns a value < 4GB even if size is greater than 4GB.
The problem resides in PAGE_MASK definition (from include/asm-x86/page.h for
example):
#define PAGE_SHIFT 12
#define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE-1))
...
#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
The "~" is performed on a 32-bit value, so everything in "and" with
PAGE_MASK greater than 4GB will be truncated to the 32-bit boundary.
Using the ALIGN() macro seems to be the right way, because it uses
typeof(addr) for the mask.
Also move the PAGE_ALIGN() definitions out of include/asm-*/page.h in
include/linux/mm.h.
See also lkml discussion: http://lkml.org/lkml/2008/6/11/237
[akpm@linux-foundation.org: fix drivers/media/video/uvc/uvc_queue.c]
[akpm@linux-foundation.org: fix v850]
[akpm@linux-foundation.org: fix powerpc]
[akpm@linux-foundation.org: fix arm]
[akpm@linux-foundation.org: fix mips]
[akpm@linux-foundation.org: fix drivers/media/video/pvrusb2/pvrusb2-dvb.c]
[akpm@linux-foundation.org: fix drivers/mtd/maps/uclinux.c]
[akpm@linux-foundation.org: fix powerpc]
Signed-off-by: Andrea Righi <righi.andrea@gmail.com>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/video/omap')
| -rw-r--r-- | drivers/video/omap/dispc.c | 1 | ||||
| -rw-r--r-- | drivers/video/omap/omapfb_main.c | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/drivers/video/omap/dispc.c b/drivers/video/omap/dispc.c index ab32ceb..ab77c51 100644 --- a/drivers/video/omap/dispc.c +++ b/drivers/video/omap/dispc.c @@ -20,6 +20,7 @@ */ #include <linux/kernel.h> #include <linux/dma-mapping.h> +#include <linux/mm.h> #include <linux/vmalloc.h> #include <linux/clk.h> #include <linux/io.h> diff --git a/drivers/video/omap/omapfb_main.c b/drivers/video/omap/omapfb_main.c index 14d0f7a..f85af5c 100644 --- a/drivers/video/omap/omapfb_main.c +++ b/drivers/video/omap/omapfb_main.c @@ -25,6 +25,7 @@ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include <linux/platform_device.h> +#include <linux/mm.h> #include <linux/uaccess.h> #include <asm/mach-types.h> |
