xprtrdma: Prevent memory allocations from driving a reclaim

Many memory allocations that xprtrdma does can fail safely. Let's
use this fact to avoid some potential deadlocks: Replace GFP_KERNEL
with GFP flags that do not try hard to acquire memory.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index 7ca58cb65e27e48eb2e5165164e8aa33e4dda3cc..44b87e4274b428483fd6382c04e869e0e4af0e05 100644 (file)
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -811,7 +811,7 @@ struct rpcrdma_req *rpcrdma_req_create(struct rpcrdma_xprt *r_xprt,
        struct rpcrdma_buffer *buffer = &r_xprt->rx_buf;
        struct rpcrdma_req *req;
 
-       req = kzalloc(sizeof(*req), GFP_KERNEL);
+       req = kzalloc(sizeof(*req), XPRTRDMA_GFP_FLAGS);
        if (req == NULL)
                goto out1;
 
@@ -926,7 +926,7 @@ struct rpcrdma_rep *rpcrdma_rep_create(struct rpcrdma_xprt *r_xprt,
        struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
        struct rpcrdma_rep *rep;
 
-       rep = kzalloc(sizeof(*rep), GFP_KERNEL);
+       rep = kzalloc(sizeof(*rep), XPRTRDMA_GFP_FLAGS);
        if (rep == NULL)
                goto out;
 
@@ -1236,10 +1236,10 @@ rpcrdma_regbuf_alloc(size_t size, enum dma_data_direction direction)
 {
        struct rpcrdma_regbuf *rb;
 
-       rb = kmalloc(sizeof(*rb), GFP_KERNEL);
+       rb = kmalloc(sizeof(*rb), XPRTRDMA_GFP_FLAGS);
        if (!rb)
                return NULL;
-       rb->rg_data = kmalloc(size, GFP_KERNEL);
+       rb->rg_data = kmalloc(size, XPRTRDMA_GFP_FLAGS);
        if (!rb->rg_data) {
                kfree(rb);
                return NULL;