Messages in this thread |  | | Subject | Re: [RFC PATCH 1/6] kenrel.h: add ALIGN_OF_LAST_BIT() | Date | Tue, 20 Mar 2012 12:32:14 +0100 | From | "Michal Nazarewicz" <> |
| |
On Tue, 20 Mar 2012 11:21:19 +0100, Lai Jiangshan <laijs@cn.fujitsu.com> wrote:
> Get the biggest 2**y that x % (2**y) == 0 for the align value. > > Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> > --- > include/linux/kernel.h | 2 ++ > 1 files changed, 2 insertions(+), 0 deletions(-) > > diff --git a/include/linux/kernel.h b/include/linux/kernel.h > index 5113462..2c439dc 100644 > --- a/include/linux/kernel.h > +++ b/include/linux/kernel.h > @@ -44,6 +44,8 @@ > #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a))) > #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0) >+#define ALIGN_OF_LAST_BIT(x) ((((x)^((x) - 1))>>1) + 1)
Wouldn't ALIGNMENT() be less confusing? After all, that's what this macro is calculating, right? Alignment of given address.
> + > #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) > /*
-- Best regards, _ _ .o. | Liege of Serenely Enlightened Majesty of o' \,=./ `o ..o | Computer Science, Michał “mina86” Nazarewicz (o o) ooo +----<email/xmpp: mpn@google.com>--------------ooO--(_)--Ooo-- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
|  |