diff options
| author | Mike Marciniszyn <mike.marciniszyn@qlogic.com> | 2011-09-23 21:16:39 +0400 |
|---|---|---|
| committer | Roland Dreier <roland@purestorage.com> | 2011-10-21 20:38:52 +0400 |
| commit | 9e1c0e43257b6df1ef012dd37c3f0f93b1ee47af (patch) | |
| tree | be40833860d385491b1ac8fa13dffe414954ee76 /drivers/infiniband/hw/qib/qib_init.c | |
| parent | cc6ea1385b43487f6ef03bdc91416c8366d28311 (diff) | |
| download | linux-9e1c0e43257b6df1ef012dd37c3f0f93b1ee47af.tar.xz | |
IB/qib: Eliminate divide/mod in converting idx to egr buf pointer
The context init now saves a shift from rcvegrbufs_perchunk
rcvegrbufs_perchunk_shift using ilog2. A BUG_ON() protects the
power of 2 assumption.
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@qlogic.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/infiniband/hw/qib/qib_init.c')
| -rw-r--r-- | drivers/infiniband/hw/qib/qib_init.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/qib/qib_init.c b/drivers/infiniband/hw/qib/qib_init.c index 021636dbeae6..21ffa7c0915f 100644 --- a/drivers/infiniband/hw/qib/qib_init.c +++ b/drivers/infiniband/hw/qib/qib_init.c @@ -183,6 +183,9 @@ struct qib_ctxtdata *qib_create_ctxtdata(struct qib_pportdata *ppd, u32 ctxt) rcd->rcvegrbuf_chunks = (rcd->rcvegrcnt + rcd->rcvegrbufs_perchunk - 1) / rcd->rcvegrbufs_perchunk; + BUG_ON(!is_power_of_2(rcd->rcvegrbufs_perchunk)); + rcd->rcvegrbufs_perchunk_shift = + ilog2(rcd->rcvegrbufs_perchunk); } return rcd; } |