diff options
Diffstat (limited to 'drivers/virtio')
| -rw-r--r-- | drivers/virtio/virtio_mem.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c index 94451b401fba..30b4d07f5263 100644 --- a/drivers/virtio/virtio_mem.c +++ b/drivers/virtio/virtio_mem.c @@ -291,6 +291,16 @@ static int virtio_mem_mb_state_prepare_next_mb(struct virtio_mem *vm) if (virtio_mem_mb_get_state(_vm, _mb_id) == _state) /* + * Calculate the bit number in the subblock bitmap for the given subblock + * inside the given memory block. + */ +static int virtio_mem_sb_bitmap_bit_nr(struct virtio_mem *vm, + unsigned long mb_id, int sb_id) +{ + return (mb_id - vm->first_mb_id) * vm->nb_sb_per_mb + sb_id; +} + +/* * Mark all selected subblocks plugged. * * Will not modify the state of the memory block. @@ -299,7 +309,7 @@ static void virtio_mem_mb_set_sb_plugged(struct virtio_mem *vm, unsigned long mb_id, int sb_id, int count) { - const int bit = (mb_id - vm->first_mb_id) * vm->nb_sb_per_mb + sb_id; + const int bit = virtio_mem_sb_bitmap_bit_nr(vm, mb_id, sb_id); __bitmap_set(vm->sb_bitmap, bit, count); } @@ -313,7 +323,7 @@ static void virtio_mem_mb_set_sb_unplugged(struct virtio_mem *vm, unsigned long mb_id, int sb_id, int count) { - const int bit = (mb_id - vm->first_mb_id) * vm->nb_sb_per_mb + sb_id; + const int bit = virtio_mem_sb_bitmap_bit_nr(vm, mb_id, sb_id); __bitmap_clear(vm->sb_bitmap, bit, count); } @@ -325,7 +335,7 @@ static bool virtio_mem_mb_test_sb_plugged(struct virtio_mem *vm, unsigned long mb_id, int sb_id, int count) { - const int bit = (mb_id - vm->first_mb_id) * vm->nb_sb_per_mb + sb_id; + const int bit = virtio_mem_sb_bitmap_bit_nr(vm, mb_id, sb_id); if (count == 1) return test_bit(bit, vm->sb_bitmap); @@ -342,7 +352,7 @@ static bool virtio_mem_mb_test_sb_unplugged(struct virtio_mem *vm, unsigned long mb_id, int sb_id, int count) { - const int bit = (mb_id - vm->first_mb_id) * vm->nb_sb_per_mb + sb_id; + const int bit = virtio_mem_sb_bitmap_bit_nr(vm, mb_id, sb_id); /* TODO: Helper similar to bitmap_set() */ return find_next_bit(vm->sb_bitmap, bit + count, bit) >= bit + count; @@ -355,7 +365,7 @@ static bool virtio_mem_mb_test_sb_unplugged(struct virtio_mem *vm, static int virtio_mem_mb_first_unplugged_sb(struct virtio_mem *vm, unsigned long mb_id) { - const int bit = (mb_id - vm->first_mb_id) * vm->nb_sb_per_mb; + const int bit = virtio_mem_sb_bitmap_bit_nr(vm, mb_id, 0); return find_next_zero_bit(vm->sb_bitmap, bit + vm->nb_sb_per_mb, bit) - bit; |