perf: Use POLLIN instead of POLL_IN for perf poll data in flag

Currently we flag available data (via poll syscall) on perf fd with
POLL_IN macro, which is normally used for SIGIO interface.

We've been lucky, because POLLIN (0x1) is subset of POLL_IN (0x20001)
and sys_poll (do_pollfd function) cut the extra bit out (0x20000).

Signed-off-by: Jiri Olsa <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Stephane Eranian <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Linus Torvalds <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

kernel/events/ring_buffer.c

@@ -13,12 +13,13 @@
 #include <linux/vmalloc.h>
 #include <linux/slab.h>
 #include <linux/circ_buf.h>
+#include <linux/poll.h>
 
 #include "internal.h"
 
 static void perf_output_wakeup(struct perf_output_handle *handle)
 {
-	atomic_set(&handle->rb->poll, POLL_IN);
+	atomic_set(&handle->rb->poll, POLLIN);
 
 	handle->event->pending_wakeup = 1;
 	irq_work_queue(&handle->event->pending);