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authorTrond Myklebust <trond.myklebust@hammerspace.com>2019-04-11 22:16:52 +0300
committerTrond Myklebust <trond.myklebust@hammerspace.com>2019-04-11 22:41:14 +0300
commitaf6b61d7ef58099c82d854395a0e002be6bd036c (patch)
tree870be0f84564dbbc5ae82534bb6d98a2054ce865 /net/sunrpc/clnt.c
parent0769663b4f580566ef6cdf366f3073dbe8022c39 (diff)
downloadlinux-af6b61d7ef58099c82d854395a0e002be6bd036c.tar.xz
Revert "SUNRPC: Micro-optimise when the task is known not to be sleeping"
This reverts commit 009a82f6437490c262584d65a14094a818bcb747. The ability to optimise here relies on compiler being able to optimise away tail calls to avoid stack overflows. Unfortunately, we are seeing reports of problems, so let's just revert. Reported-by: Daniel Mack <daniel@zonque.org> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Diffstat (limited to 'net/sunrpc/clnt.c')
-rw-r--r--net/sunrpc/clnt.c45
1 files changed, 8 insertions, 37 deletions
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 187d10443a15..1d0395ef62c9 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -1540,7 +1540,6 @@ call_start(struct rpc_task *task)
clnt->cl_stats->rpccnt++;
task->tk_action = call_reserve;
rpc_task_set_transport(task, clnt);
- call_reserve(task);
}
/*
@@ -1554,9 +1553,6 @@ call_reserve(struct rpc_task *task)
task->tk_status = 0;
task->tk_action = call_reserveresult;
xprt_reserve(task);
- if (rpc_task_need_resched(task))
- return;
- call_reserveresult(task);
}
static void call_retry_reserve(struct rpc_task *task);
@@ -1579,7 +1575,6 @@ call_reserveresult(struct rpc_task *task)
if (status >= 0) {
if (task->tk_rqstp) {
task->tk_action = call_refresh;
- call_refresh(task);
return;
}
@@ -1605,7 +1600,6 @@ call_reserveresult(struct rpc_task *task)
/* fall through */
case -EAGAIN: /* woken up; retry */
task->tk_action = call_retry_reserve;
- call_retry_reserve(task);
return;
case -EIO: /* probably a shutdown */
break;
@@ -1628,9 +1622,6 @@ call_retry_reserve(struct rpc_task *task)
task->tk_status = 0;
task->tk_action = call_reserveresult;
xprt_retry_reserve(task);
- if (rpc_task_need_resched(task))
- return;
- call_reserveresult(task);
}
/*
@@ -1645,9 +1636,6 @@ call_refresh(struct rpc_task *task)
task->tk_status = 0;
task->tk_client->cl_stats->rpcauthrefresh++;
rpcauth_refreshcred(task);
- if (rpc_task_need_resched(task))
- return;
- call_refreshresult(task);
}
/*
@@ -1666,7 +1654,6 @@ call_refreshresult(struct rpc_task *task)
case 0:
if (rpcauth_uptodatecred(task)) {
task->tk_action = call_allocate;
- call_allocate(task);
return;
}
/* Use rate-limiting and a max number of retries if refresh
@@ -1685,7 +1672,6 @@ call_refreshresult(struct rpc_task *task)
task->tk_cred_retry--;
dprintk("RPC: %5u %s: retry refresh creds\n",
task->tk_pid, __func__);
- call_refresh(task);
return;
}
dprintk("RPC: %5u %s: refresh creds failed with error %d\n",
@@ -1711,10 +1697,8 @@ call_allocate(struct rpc_task *task)
task->tk_status = 0;
task->tk_action = call_encode;
- if (req->rq_buffer) {
- call_encode(task);
+ if (req->rq_buffer)
return;
- }
if (proc->p_proc != 0) {
BUG_ON(proc->p_arglen == 0);
@@ -1740,12 +1724,8 @@ call_allocate(struct rpc_task *task)
status = xprt->ops->buf_alloc(task);
xprt_inject_disconnect(xprt);
- if (status == 0) {
- if (rpc_task_need_resched(task))
- return;
- call_encode(task);
+ if (status == 0)
return;
- }
if (status != -ENOMEM) {
rpc_exit(task, status);
return;
@@ -1828,8 +1808,12 @@ call_encode(struct rpc_task *task)
xprt_request_enqueue_receive(task);
xprt_request_enqueue_transmit(task);
out:
- task->tk_action = call_bind;
- call_bind(task);
+ task->tk_action = call_transmit;
+ /* Check that the connection is OK */
+ if (!xprt_bound(task->tk_xprt))
+ task->tk_action = call_bind;
+ else if (!xprt_connected(task->tk_xprt))
+ task->tk_action = call_connect;
}
/*
@@ -1847,7 +1831,6 @@ rpc_task_handle_transmitted(struct rpc_task *task)
{
xprt_end_transmit(task);
task->tk_action = call_transmit_status;
- call_transmit_status(task);
}
/*
@@ -1865,7 +1848,6 @@ call_bind(struct rpc_task *task)
if (xprt_bound(xprt)) {
task->tk_action = call_connect;
- call_connect(task);
return;
}
@@ -1896,7 +1878,6 @@ call_bind_status(struct rpc_task *task)
dprint_status(task);
task->tk_status = 0;
task->tk_action = call_connect;
- call_connect(task);
return;
}
@@ -1981,7 +1962,6 @@ call_connect(struct rpc_task *task)
if (xprt_connected(xprt)) {
task->tk_action = call_transmit;
- call_transmit(task);
return;
}
@@ -2051,7 +2031,6 @@ call_connect_status(struct rpc_task *task)
case 0:
clnt->cl_stats->netreconn++;
task->tk_action = call_transmit;
- call_transmit(task);
return;
}
rpc_exit(task, status);
@@ -2087,9 +2066,6 @@ call_transmit(struct rpc_task *task)
xprt_transmit(task);
}
xprt_end_transmit(task);
- if (rpc_task_need_resched(task))
- return;
- call_transmit_status(task);
}
/*
@@ -2107,9 +2083,6 @@ call_transmit_status(struct rpc_task *task)
if (rpc_task_transmitted(task)) {
if (task->tk_status == 0)
xprt_request_wait_receive(task);
- if (rpc_task_need_resched(task))
- return;
- call_status(task);
return;
}
@@ -2170,7 +2143,6 @@ call_bc_encode(struct rpc_task *task)
{
xprt_request_enqueue_transmit(task);
task->tk_action = call_bc_transmit;
- call_bc_transmit(task);
}
/*
@@ -2261,7 +2233,6 @@ call_status(struct rpc_task *task)
status = task->tk_status;
if (status >= 0) {
task->tk_action = call_decode;
- call_decode(task);
return;
}