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virtio-mem: factor out calculation of the bit number within the subblock bitmap

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The calculation is already complicated enough, let's limit it to one
location.

Reviewed-by: Wei Yang <richard.weiyang@linux.alibaba.com>
Reviewed-by: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/r/20201112133815.13332-7-david@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
David Hildenbrand 2020-11-12 14:37:52 +01:00 committed by Michael S. Tsirkin
parent 2a6285114b
commit 41e6215c6d
1 changed files with 15 additions and 5 deletions
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20
drivers/virtio/virtio_mem.c
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@ -290,6 +290,16 @@ static int virtio_mem_mb_state_prepare_next_mb(struct virtio_mem *vm)
_mb_id--) \
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.
*
@ -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;