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| author |   Michael S. Tsirkin <mst@redhat.com> | 2014-10-07 16:39:42 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2014-12-09 12:05:23 +0200 |
| commit | e16e12be34648777606a2c03a3526409b38f0e63 (patch) | |
| tree | 36298911ba8eed0a4805c2c30a56d92520d23432 /tools/virtio/linux/virtio.h | |
| parent | virtio: add low-level APIs for feature bits (diff) | |
| download | linux-dev-e16e12be34648777606a2c03a3526409b38f0e63.tar.xz linux-dev-e16e12be34648777606a2c03a3526409b38f0e63.zip | |
virtio: use u32, not bitmap for features
It seemed like a good idea to use bitmap for features
in struct virtio_device, but it's actually a pain,
and seems to become even more painful when we get more
than 32 feature bits. Just change it to a u32 for now.
Based on patch by Rusty.
Suggested-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Diffstat (limited to 'tools/virtio/linux/virtio.h')
| -rw-r--r-- | tools/virtio/linux/virtio.h | 22 |
1 files changed, 1 insertions, 21 deletions
diff --git a/tools/virtio/linux/virtio.h b/tools/virtio/linux/virtio.h index 5a2d1f0f6bc7..72bff70bfeeb 100644 --- a/tools/virtio/linux/virtio.h +++ b/tools/virtio/linux/virtio.h @@ -6,31 +6,11 @@ /* TODO: empty stubs for now. Broken but enough for virtio_ring.c */ #define list_add_tail(a, b) do {} while (0) #define list_del(a) do {} while (0) - -#define BIT_WORD(nr) ((nr) / BITS_PER_LONG) -#define BITS_PER_BYTE 8 -#define BITS_PER_LONG (sizeof(long) * BITS_PER_BYTE) -#define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG)) - -/* TODO: Not atomic as it should be: - * we don't use this for anything important. */ -static inline void clear_bit(int nr, volatile unsigned long *addr) -{ - unsigned long mask = BIT_MASK(nr); - unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr); - - *p &= ~mask; -} - -static inline int test_bit(int nr, const volatile unsigned long *addr) -{ - return 1UL & (addr[BIT_WORD(nr)] >> (nr & (BITS_PER_LONG-1))); -} /* end of stubs */ struct virtio_device { void *dev; - unsigned long features[1]; + u32 features; }; struct virtqueue { |