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| author | Rusty Russell <rusty@rustcorp.com.au> | 2009-03-30 21:55:22 -0600 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2009-03-30 21:55:23 +1030 |
| commit | c5f841f1780dad7efb7eca092f60742d47f47d25 (patch) | |
| tree | 6a27622d96f5327408c75b914c3a54120dc1d866 /drivers/virtio | |
| parent | 3a35ce7dcefe9e80a00603a195269fbaf6e7d901 (diff) | |
| download | lwn-c5f841f1780dad7efb7eca092f60742d47f47d25.tar.gz lwn-c5f841f1780dad7efb7eca092f60742d47f47d25.zip | |
virtio: more neatening of virtio_ring macros.
Impact: cleanup
Roel Kluin drew attention to these macros with his patch: here I
neaten them a little further:
1) Add a comment on what START_USE and END_USE are checking,
2) Brackets around _vq in BAD_RING,
3) Neaten formatting for START_USE so it's less than 80 cols.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/virtio')
| -rw-r--r-- | drivers/virtio/virtio_ring.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 12273bf9b3b2..5c52369ab9bb 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -24,9 +24,15 @@ #ifdef DEBUG /* For development, we want to crash whenever the ring is screwed. */ #define BAD_RING(_vq, fmt...) \ - do { dev_err(&_vq->vq.vdev->dev, fmt); BUG(); } while(0) -#define START_USE(_vq) \ - do { if ((_vq)->in_use) panic("in_use = %i\n", (_vq)->in_use); (_vq)->in_use = __LINE__; mb(); } while(0) + do { dev_err(&(_vq)->vq.vdev->dev, fmt); BUG(); } while(0) +/* Caller is supposed to guarantee no reentry. */ +#define START_USE(_vq) \ + do { \ + if ((_vq)->in_use) \ + panic("in_use = %i\n", (_vq)->in_use); \ + (_vq)->in_use = __LINE__; \ + mb(); \ + } while(0) #define END_USE(_vq) \ do { BUG_ON(!(_vq)->in_use); (_vq)->in_use = 0; mb(); } while(0) #else |