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| author | Matthew Wilcox <willy@infradead.org> | 2018-07-11 14:02:23 -0700 |
|---|---|---|
| committer | Dominique Martinet <dominique.martinet@cea.fr> | 2018-08-13 09:21:44 +0900 |
| commit | 2557d0c57c0c11af915d0d4d97402527958c0c01 (patch) | |
| tree | 6f396b3331646b3f552e37a47be0bda0ecb1684f /net/9p | |
| parent | f28cdf0430fc92acaa718e15598bdad6cb236a4d (diff) | |
| download | linux-2557d0c57c0c11af915d0d4d97402527958c0c01.tar.gz linux-2557d0c57c0c11af915d0d4d97402527958c0c01.tar.bz2 linux-2557d0c57c0c11af915d0d4d97402527958c0c01.zip | |
9p: Embed wait_queue_head into p9_req_t
On a 64-bit system, the wait_queue_head_t is 24 bytes while the pointer
to it is 8 bytes. Growing the p9_req_t by 16 bytes is better than
performing a 24-byte memory allocation.
Link: http://lkml.kernel.org/r/20180711210225.19730-5-willy@infradead.org
Signed-off-by: Matthew Wilcox <willy@infradead.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
Cc: Eric Van Hensbergen <ericvh@gmail.com>
Cc: Ron Minnich <rminnich@sandia.gov>
Cc: Latchesar Ionkov <lucho@ionkov.net>
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
Diffstat (limited to 'net/9p')
| -rw-r--r-- | net/9p/client.c | 19 | ||||
| -rw-r--r-- | net/9p/trans_virtio.c | 2 |
2 files changed, 6 insertions, 15 deletions
diff --git a/net/9p/client.c b/net/9p/client.c index cd33cf636c47..33717b1b84d8 100644 --- a/net/9p/client.c +++ b/net/9p/client.c @@ -283,8 +283,9 @@ p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size) return ERR_PTR(-ENOMEM); } for (col = 0; col < P9_ROW_MAXTAG; col++) { - c->reqs[row][col].status = REQ_STATUS_IDLE; - c->reqs[row][col].tc = NULL; + req = &c->reqs[row][col]; + req->status = REQ_STATUS_IDLE; + init_waitqueue_head(&req->wq); } c->max_tag += P9_ROW_MAXTAG; } @@ -294,13 +295,6 @@ p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size) col = tag % P9_ROW_MAXTAG; req = &c->reqs[row][col]; - if (!req->wq) { - req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS); - if (!req->wq) - goto grow_failed; - init_waitqueue_head(req->wq); - } - if (!req->tc) req->tc = p9_fcall_alloc(alloc_msize); if (!req->rc) @@ -320,9 +314,7 @@ grow_failed: pr_err("Couldn't grow tag array\n"); kfree(req->tc); kfree(req->rc); - kfree(req->wq); req->tc = req->rc = NULL; - req->wq = NULL; return ERR_PTR(-ENOMEM); } @@ -410,7 +402,6 @@ static void p9_tag_cleanup(struct p9_client *c) /* free requests associated with tags */ for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { for (col = 0; col < P9_ROW_MAXTAG; col++) { - kfree(c->reqs[row][col].wq); kfree(c->reqs[row][col].tc); kfree(c->reqs[row][col].rc); } @@ -453,7 +444,7 @@ void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) smp_wmb(); req->status = status; - wake_up(req->wq); + wake_up(&req->wq); p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag); } EXPORT_SYMBOL(p9_client_cb); @@ -774,7 +765,7 @@ p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) } again: /* Wait for the response */ - err = wait_event_killable(*req->wq, req->status >= REQ_STATUS_RCVD); + err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD); /* * Make sure our req is coherent with regard to updates in other diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c index eaacce086427..3f69c428ddf9 100644 --- a/net/9p/trans_virtio.c +++ b/net/9p/trans_virtio.c @@ -490,7 +490,7 @@ req_retry_pinned: virtqueue_kick(chan->vq); spin_unlock_irqrestore(&chan->lock, flags); p9_debug(P9_DEBUG_TRANS, "virtio request kicked\n"); - err = wait_event_killable(*req->wq, req->status >= REQ_STATUS_RCVD); + err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD); /* * Non kernel buffers are pinned, unpin them */ |