SUNRPC: Trim stack utilization in the wrap and unwrap paths

By preventing compiler inlining of the integrity and privacy
helpers, stack utilization for the common case (authentication only)
goes way down.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
index 98b2c8bc8f40490ca88de7e18257d4db89222d52..45707a306f205f9d115c3173dba9288bec20ac53 100644 (file)
--- a/net/sunrpc/auth_gss/auth_gss.c
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -1724,8 +1724,9 @@ bad_mic:
        goto out;
 }
 
-static int gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
-                             struct rpc_task *task, struct xdr_stream *xdr)
+static noinline_for_stack int
+gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
+                  struct rpc_task *task, struct xdr_stream *xdr)
 {
        struct rpc_rqst *rqstp = task->tk_rqstp;
        struct xdr_buf integ_buf, *snd_buf = &rqstp->rq_snd_buf;
@@ -1816,8 +1817,9 @@ out:
        return -EAGAIN;
 }
 
-static int gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
-                            struct rpc_task *task, struct xdr_stream *xdr)
+static noinline_for_stack int
+gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
+                 struct rpc_task *task, struct xdr_stream *xdr)
 {
        struct rpc_rqst *rqstp = task->tk_rqstp;
        struct xdr_buf  *snd_buf = &rqstp->rq_snd_buf;
@@ -1947,7 +1949,7 @@ gss_unwrap_resp_auth(struct rpc_cred *cred)
  *             proc_req_arg_t arg;
  *     };
  */
-static int
+static noinline_for_stack int
 gss_unwrap_resp_integ(struct rpc_task *task, struct rpc_cred *cred,
                      struct gss_cl_ctx *ctx, struct rpc_rqst *rqstp,
                      struct xdr_stream *xdr)
@@ -2021,7 +2023,7 @@ bad_mic:
        goto out;
 }
 
-static int
+static noinline_for_stack int
 gss_unwrap_resp_priv(struct rpc_task *task, struct rpc_cred *cred,
                     struct gss_cl_ctx *ctx, struct rpc_rqst *rqstp,
                     struct xdr_stream *xdr)