path: root/arch/sparc/lib
diff options
authorAkinobu Mita <>2013-03-29 03:44:43 +0000
committerDavid S. Miller <>2013-03-31 19:29:12 -0400
commit54df2db36c93bbb8c757f172d97c577040de6abb (patch)
tree201c8a8217ef40e4fc5eeb8e7b3c5f17ad96b29c /arch/sparc/lib
parent71196a26d85be2aae2e587dfd3c3190a651133c6 (diff)
sparc/srmmu: clear trailing edge of bitmap properly
srmmu_nocache_bitmap is cleared by bit_map_init(). But bit_map_init() attempts to clear by memset(), so it can't clear the trailing edge of bitmap properly on big-endian architecture if the number of bits is not a multiple of BITS_PER_LONG. Actually, the number of bits in srmmu_nocache_bitmap is not always a multiple of BITS_PER_LONG. It is calculated as below: bitmap_bits = srmmu_nocache_size >> SRMMU_NOCACHE_BITMAP_SHIFT; srmmu_nocache_size is decided proportionally by the amount of system RAM and it is rounded to a multiple of PAGE_SIZE. SRMMU_NOCACHE_BITMAP_SHIFT is defined as (PAGE_SHIFT - 4). So it can only be said that bitmap_bits is a multiple of 16. This fixes the problem by using bitmap_clear() instead of memset() in bit_map_init() and this also uses BITS_TO_LONGS() to calculate correct size at bitmap allocation time. Signed-off-by: Akinobu Mita <> Cc: "David S. Miller" <> Cc: Signed-off-by: David S. Miller <>
Diffstat (limited to 'arch/sparc/lib')
1 files changed, 1 insertions, 5 deletions
diff --git a/arch/sparc/lib/bitext.c b/arch/sparc/lib/bitext.c
index 48d00e72ce15..8ec4e9c0251a 100644
--- a/arch/sparc/lib/bitext.c
+++ b/arch/sparc/lib/bitext.c
@@ -119,11 +119,7 @@ void bit_map_clear(struct bit_map *t, int offset, int len)
void bit_map_init(struct bit_map *t, unsigned long *map, int size)
- if ((size & 07) != 0)
- BUG();
- memset(map, 0, size>>3);
+ bitmap_zero(map, size);
memset(t, 0, sizeof *t);
t->map = map;