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Date: Mon, 13 Aug 2007 18:22:06 +0530 From: vignesh babu <vignesh.babu@...ro.com> To: mingo@...hat.com, neilb@...e.de Cc: linux-raid@...r.kernel.org, linux-kernel <linux-kernel@...r.kernel.org> Subject: [kj] is_power_of_2 in drivers/md/dm-raid1.c Replacing n & (n - 1) for power of 2 check by is_power_of_2(n) Signed-off-by: vignesh babu <vignesh.babu@...ro.com> --- diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c index 144071e..969b398 100644 --- a/drivers/md/dm-raid1.c +++ b/drivers/md/dm-raid1.c @@ -19,6 +19,7 @@ #include <linux/time.h> #include <linux/vmalloc.h> #include <linux/workqueue.h> +#include <linux/log2.h> #define DM_MSG_PREFIX "raid1" #define DM_IO_PAGES 64 @@ -994,7 +995,7 @@ static void free_context(struct mirror_set *ms, struct dm_target *ti, static inline int _check_region_size(struct dm_target *ti, uint32_t size) { - return !(size % (PAGE_SIZE >> 9) || (size & (size - 1)) || + return !(size % (PAGE_SIZE >> 9) || !is_power_of_2(size) || size > ti->len); } diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c index 83ddbfe..ad2836a 100644 --- a/drivers/md/dm-snap.c +++ b/drivers/md/dm-snap.c @@ -17,6 +17,7 @@ #include <linux/module.h> #include <linux/slab.h> #include <linux/vmalloc.h> +#include <linux/log2.h> #include "dm-snap.h" #include "dm-bio-list.h" @@ -415,7 +416,7 @@ static int set_chunk_size(struct dm_snapshot *s, const char *chunk_size_arg, chunk_size = round_up(chunk_size, PAGE_SIZE >> 9); /* Check chunk_size is a power of 2 */ - if (chunk_size & (chunk_size - 1)) { + if (!is_power_of_2(chunk_size)) { *error = "Chunk size is not a power of 2"; return -EINVAL; } diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c index 51f5e07..969944a 100644 --- a/drivers/md/dm-stripe.c +++ b/drivers/md/dm-stripe.c @@ -11,6 +11,7 @@ #include <linux/blkdev.h> #include <linux/bio.h> #include <linux/slab.h> +#include <linux/log2.h> #define DM_MSG_PREFIX "striped" @@ -99,7 +100,7 @@ static int stripe_ctr(struct dm_target *ti, unsigned int argc, char **argv) /* * chunk_size is a power of two */ - if (!chunk_size || (chunk_size & (chunk_size - 1)) || + if (!is_power_of_2(chunk_size) || (chunk_size < (PAGE_SIZE >> SECTOR_SHIFT))) { ti->error = "Invalid chunk size"; return -EINVAL; -- Vignesh Babu BM _____________________________________________________________ "Why is it that every time I'm with you, makes me believe in magic?" - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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