[PATCH] epoll: simplify ep_busy_loop by removing always 0 argument

[Lin Feng <linf@wangsu.com>]

Commit 00b27634bc471("epoll: replace gotos with a proper loop") refactored
ep_poll and always feeds ep_busy_loop with a time_out value of 0, nonblock
mode for ep_busy_loop has sunk since, IOW nonblock mode checking has been
taken over by ep_poll itself, codes snipped:

static int ep_poll(struct eventpoll *ep...
{
...
    if (timed_out)
        return 0;

    eavail = ep_busy_loop(ep, timed_out);
...
}

Given this fact codes can be simplified a bit for ep_busy_loop.

Signed-off-by: Lin Feng <linf@wangsu.com>
---
 fs/eventpoll.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 7c0980db77b3..1fc770270ab8 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -438,7 +438,7 @@ static bool ep_busy_loop_end(void *p, unsigned long start_time)
  *
  * we must do our busy polling with irqs enabled
  */
-static bool ep_busy_loop(struct eventpoll *ep, int nonblock)
+static bool ep_busy_loop(struct eventpoll *ep)
 {
 	unsigned int napi_id = READ_ONCE(ep->napi_id);
 	u16 budget = READ_ONCE(ep->busy_poll_budget);
@@ -448,7 +448,7 @@ static bool ep_busy_loop(struct eventpoll *ep, int nonblock)
 		budget = BUSY_POLL_BUDGET;
 
 	if (napi_id >= MIN_NAPI_ID && ep_busy_loop_on(ep)) {
-		napi_busy_loop(napi_id, nonblock ? NULL : ep_busy_loop_end,
+		napi_busy_loop(napi_id, ep_busy_loop_end,
 			       ep, prefer_busy_poll, budget);
 		if (ep_events_available(ep))
 			return true;
@@ -560,7 +560,7 @@ static void ep_resume_napi_irqs(struct eventpoll *ep)
 
 #else
 
-static inline bool ep_busy_loop(struct eventpoll *ep, int nonblock)
+static inline bool ep_busy_loop(struct eventpoll *ep)
 {
 	return false;
 }
@@ -2047,7 +2047,7 @@ static int ep_poll(struct eventpoll *ep, struct epoll_event __user *events,
 		if (timed_out)
 			return 0;
 
-		eavail = ep_busy_loop(ep, timed_out);
+		eavail = ep_busy_loop(ep);
 		if (eavail)
 			continue;
 
-- 
2.48.1