diff options
| author | vignesh babu <vignesh.babu@wipro.com> | 2007-10-19 22:38:44 +0100 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2007-10-20 02:01:06 +0100 |
| commit | 6f3c3f0afa50782dc1742c968646c491657d255a (patch) | |
| tree | cb1f69504094cec60564be51c405bba5eb66c322 | |
| parent | ae9da83f6d800fe1f3b23bfbc8f7222ad1c5bb74 (diff) | |
dm: use is_power_of_2
Replacing n & (n - 1) for power of 2 check by is_power_of_2(n)
Signed-off-by: vignesh babu <vignesh.babu@wipro.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| -rw-r--r-- | drivers/md/dm-raid1.c | 3 | ||||
| -rw-r--r-- | drivers/md/dm-snap.c | 3 | ||||
| -rw-r--r-- | drivers/md/dm-stripe.c | 3 |
3 files changed, 6 insertions, 3 deletions
diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c index 6f60f307fae2..2b2ca371e20b 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 @@ -995,7 +996,7 @@ 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 98a633f3d6b0..cee16fadd9ee 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 51f5e0760012..969944a8aba2 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; |