netdev - [PATCH 4/4] net: remove sock_poll_busy

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Message-Id: <20180730074213.16832-5-hch@lst.de>
Date:   Mon, 30 Jul 2018 09:42:13 +0200
From:   Christoph Hellwig <hch@....de>
To:     netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH 4/4] net: remove sock_poll_busy_flag

Fold it into the only caller to make the code simpler and easier to read.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 include/net/busy_poll.h |  6 ------
 net/socket.c            | 16 +++++++++++-----
 2 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/include/net/busy_poll.h b/include/net/busy_poll.h
index 25d762cf47f2..71c72a939bf8 100644
--- a/include/net/busy_poll.h
+++ b/include/net/busy_poll.h
@@ -121,12 +121,6 @@ static inline void sk_busy_loop(struct sock *sk, int nonblock)
 #endif
 }
 
-/* if this socket can poll_ll, tell the system call */
-static inline __poll_t sock_poll_busy_flag(struct socket *sock)
-{
-	return sk_can_busy_loop(sock->sk) ? POLL_BUSY_LOOP : 0;
-}
-
 /* used in the NIC receive handler to mark the skb */
 static inline void skb_mark_napi_id(struct sk_buff *skb,
 				    struct napi_struct *napi)
diff --git a/net/socket.c b/net/socket.c
index 674434127b3a..5b7df6695f4f 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -1130,15 +1130,21 @@ EXPORT_SYMBOL(sock_create_lite);
 static __poll_t sock_poll(struct file *file, poll_table *wait)
 {
 	struct socket *sock = file->private_data;
-	__poll_t events = poll_requested_events(wait);
+	__poll_t events = poll_requested_events(wait), flag = 0;
 
 	if (!sock->ops->poll)
 		return 0;
 
-	/* poll once if requested by the syscall */
-	if (sk_can_busy_loop(sock->sk) && (events & POLL_BUSY_LOOP))
-		sk_busy_loop(sock->sk, 1);
-	return sock->ops->poll(file, sock, wait) | sock_poll_busy_flag(sock);
+	if (sk_can_busy_loop(sock->sk)) {
+		/* poll once if requested by the syscall */
+		if (events & POLL_BUSY_LOOP)
+			sk_busy_loop(sock->sk, 1);
+
+		/* if this socket can poll_ll, tell the system call */
+		flag = POLL_BUSY_LOOP;
+	}
+
+	return sock->ops->poll(file, sock, wait) | flag;
 }
 
 static int sock_mmap(struct file *file, struct vm_area_struct *vma)
-- 
2.18.0