leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

sparc/srmmu: clear trailing edge of bitmap properly

Browse Source 
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 <akinobu.mita@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: sparclinux@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Akinobu Mita
2013-03-29 03:44:43 +00:00
committed by David S. Miller
parent 71196a26d8
commit 54df2db36c
2 changed files with 4 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
arch/sparc/lib/bitext.c
View File

@@ -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);
spin_lock_init(&t->lock);
t->map = map;