axe linux aio

Changes

@@ -9,6 +9,7 @@ TODO: document EV_TSTAMP_T
           also used (found via cpan tester service).
         - support a lot more "uncommon" compile time configurations,
           such as ev_embed enabled but ev_timer disabled.
+        - the linux aio backend is no longer compiled in by default.
 
 4.31 Fri Dec 20 21:58:29 CET 2019
 	- handle backends with minimum wait time a bit better by not

ev.c

@@ -119,7 +119,7 @@
    
 # if HAVE_LINUX_AIO_ABI_H
 #  ifndef EV_USE_LINUXAIO
-#   define EV_USE_LINUXAIO EV_FEATURE_BACKENDS
+#   define EV_USE_LINUXAIO 0 /* was: EV_FEATURE_BACKENDS, always off by default */
 #  endif
 # else
 #  undef EV_USE_LINUXAIO
@@ -346,7 +346,7 @@
 
 #ifndef EV_USE_LINUXAIO
 # if __linux /* libev currently assumes linux/aio_abi.h is always available on linux */
-#  define EV_USE_LINUXAIO 1
+#  define EV_USE_LINUXAIO 0 /* was: 1, always off by default */
 # else
 #  define EV_USE_LINUXAIO 0
 # endif

ev_linuxaio.c

@@ -270,9 +270,8 @@ linuxaio_modify (EV_P_ int fd, int oev, int nev)
       ++anfd->egen;
     }
 
-  iocb->io.aio_buf =
-      (nev & EV_READ ? POLLIN : 0)
-      | (nev & EV_WRITE ? POLLOUT : 0);
+  iocb->io.aio_buf = (nev & EV_READ  ? POLLIN  : 0)
+                   | (nev & EV_WRITE ? POLLOUT : 0);
 
   if (nev)
     {