[PATCH] severing poll.h -> mm.h

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index afaf3e8..2f645df 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -26,6 +26,7 @@
 #include <sound/asound.h>
 #include <sound/memalloc.h>
 #include <linux/poll.h>
+#include <linux/mm.h>
 #include <linux/bitops.h>
 
 #define snd_pcm_substream_chip(substream) ((substream)->private_data)