From: vignesh babu Date: Fri, 19 Oct 2007 21:38:44 +0000 (+0100) Subject: dm: use is_power_of_2 X-Git-Tag: v2.6.24-rc1~130^2~20 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=6f3c3f0afa50782dc1742c968646c491657d255a;p=linux-2.6-omap-h63xx.git 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 Signed-off-by: Alasdair G Kergon --- diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c index 6f60f307fae..2b2ca371e20 100644 --- a/drivers/md/dm-raid1.c +++ b/drivers/md/dm-raid1.c @@ -19,6 +19,7 @@ #include #include #include +#include #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 98a633f3d6b..cee16fadd9e 100644 --- a/drivers/md/dm-snap.c +++ b/drivers/md/dm-snap.c @@ -17,6 +17,7 @@ #include #include #include +#include #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 51f5e076001..969944a8aba 100644 --- a/drivers/md/dm-stripe.c +++ b/drivers/md/dm-stripe.c @@ -11,6 +11,7 @@ #include #include #include +#include #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;