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| author | Steven Rostedt (Red Hat) <rostedt@goodmis.org> | 2013-08-13 16:43:39 -0400 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2013-08-13 16:43:39 -0400 |
| commit | 5a04ef501433ae85b9cea986791fe222c45ce3a7 (patch) | |
| tree | 6c3eba2f7e8aec171d95a96befff111fbeba7275 /include/xen/interface/io/ring.h | |
| parent | 6bd59b2c5c8042004937c6f2b1f3c315a6239429 (diff) | |
| parent | 401390fbc8e28bb07851be6bbe0b343a0e9f8306 (diff) | |
Merge tag 'v3.2.50' into v3.2-rt
This is the 3.2.50 stable release
Diffstat (limited to 'include/xen/interface/io/ring.h')
| -rw-r--r-- | include/xen/interface/io/ring.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/xen/interface/io/ring.h b/include/xen/interface/io/ring.h index 75271b9a8f61..7d28aff605c7 100644 --- a/include/xen/interface/io/ring.h +++ b/include/xen/interface/io/ring.h @@ -188,6 +188,11 @@ struct __name##_back_ring { \ #define RING_REQUEST_CONS_OVERFLOW(_r, _cons) \ (((_cons) - (_r)->rsp_prod_pvt) >= RING_SIZE(_r)) +/* Ill-behaved frontend determination: Can there be this many requests? */ +#define RING_REQUEST_PROD_OVERFLOW(_r, _prod) \ + (((_prod) - (_r)->rsp_prod_pvt) > RING_SIZE(_r)) + + #define RING_PUSH_REQUESTS(_r) do { \ wmb(); /* back sees requests /before/ updated producer index */ \ (_r)->sring->req_prod = (_r)->req_prod_pvt; \ |