[PATCH v1 3/4] SUNRPC: Convert svc_tcp_restore_pages() to the release_pages() API

[Chuck Lever <cel@xxxxxxxxxx>]

From: Chuck Lever <chuck.lever@xxxxxxxxxx>

Instead of invoking put_page() one-at-a-time, pass the portion of
rq_pages to be released directly to release_pages() to reduce the
number of times each server thread invokes a page allocator API.

Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
 net/sunrpc/svcsock.c |   12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index 302a14dd7882..44f72b558a1c 100644
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -812,12 +812,12 @@ static size_t svc_tcp_restore_pages(struct svc_sock *svsk,
 	if (!len)
 		return 0;
 	npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
-	for (i = 0; i < npages; i++) {
-		if (rqstp->rq_pages[i] != NULL)
-			put_page(rqstp->rq_pages[i]);
-		BUG_ON(svsk->sk_pages[i] == NULL);
-		rqstp->rq_pages[i] = svsk->sk_pages[i];
-		svsk->sk_pages[i] = NULL;
+	if (npages) {
+		release_pages(rqstp->rq_pages, npages);
+		for (i = 0; i < npages; i++) {
+			rqstp->rq_pages[i] = svsk->sk_pages[i];
+			svsk->sk_pages[i] = NULL;
+		}
 	}
 	rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]);
 	return len;