linux-kernel - [PATCH -next] fs/epoll: simply CONFIG_NET_RX_BUSY

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Date:   Wed, 25 Jul 2018 11:56:20 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     akpm@...ux-foundation.org
Cc:     jbaron@...mai.com, viro@...iv.linux.org.uk,
        linux-kernel@...r.kernel.org, dave@...olabs.net,
        Davidlohr Bueso <dbueso@...e.de>
Subject: [PATCH -next] fs/epoll: simply CONFIG_NET_RX_BUSY_POLL ifdefery

... 'tis easier on the eye.

Signed-off-by: Davidlohr Bueso <dbueso@...e.de>
---
 fs/eventpoll.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 1b1abc461fc0..0ab82d0d4e02 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -391,7 +391,6 @@ static bool ep_busy_loop_end(void *p, unsigned long start_time)
 
 	return ep_events_available(ep) || busy_loop_timeout(start_time);
 }
-#endif /* CONFIG_NET_RX_BUSY_POLL */
 
 /*
  * Busy poll if globally on and supporting sockets found && no events,
@@ -401,20 +400,16 @@ static bool ep_busy_loop_end(void *p, unsigned long start_time)
  */
 static void ep_busy_loop(struct eventpoll *ep, int nonblock)
 {
-#ifdef CONFIG_NET_RX_BUSY_POLL
 	unsigned int napi_id = READ_ONCE(ep->napi_id);
 
 	if ((napi_id >= MIN_NAPI_ID) && net_busy_loop_on())
 		napi_busy_loop(napi_id, nonblock ? NULL : ep_busy_loop_end, ep);
-#endif
 }
 
 static inline void ep_reset_busy_poll_napi_id(struct eventpoll *ep)
 {
-#ifdef CONFIG_NET_RX_BUSY_POLL
 	if (ep->napi_id)
 		ep->napi_id = 0;
-#endif
 }
 
 /*
@@ -422,7 +417,6 @@ static inline void ep_reset_busy_poll_napi_id(struct eventpoll *ep)
  */
 static inline void ep_set_busy_poll_napi_id(struct epitem *epi)
 {
-#ifdef CONFIG_NET_RX_BUSY_POLL
 	struct eventpoll *ep;
 	unsigned int napi_id;
 	struct socket *sock;
@@ -452,9 +446,15 @@ static inline void ep_set_busy_poll_napi_id(struct epitem *epi)
 
 	/* record NAPI ID for use in next busy poll */
 	ep->napi_id = napi_id;
-#endif
 }
 
+#else
+#define ep_busy_loop(ep, nonblock)		do { } while (0)
+#define ep_reset_busy_poll_napi_id(ep)		do { } while (0)
+#define ep_set_busy_poll_napi_id(epi)		do { } while (0)
+
+#endif /* CONFIG_NET_RX_BUSY_POLL */
+
 /**
  * ep_call_nested - Perform a bound (possibly) nested call, by checking
  *                  that the recursion limit is not exceeded, and that
-- 
2.16.4