remove asm/atomic.h

For historic resons, we carry old atomic operations support in
liblitmus. This is no longer useful:
1) There is actually no client for these calls in liblitmus.
2) There is now a standard gcc API for this purpose.

	http://gcc.gnu.org/onlinedocs/gcc/Atomic-Builtins.html

Thus, we can reduce our maintenance burden.

1 files changed, 1 insertions, 2 deletions

diff --git a/src/kernel_iface.c b/src/kernel_iface.c
index 25e0cea..1426795 100644
--- a/src/kernel_iface.c
+++ b/src/kernel_iface.c
@@ -8,7 +8,6 @@
 
 #include "litmus.h"
 #include "internal.h"
-#include "asm/atomic.h"
 
 #define LITMUS_CTRL_DEVICE "/dev/litmus/ctrl"
 #define CTRL_PAGES 1
@@ -66,7 +65,7 @@ void exit_np(void)
 {
         if (likely(ctrl_page != NULL) && --ctrl_page->np_flag == 0) {
                 /* became preemptive, let's check for delayed preemptions */
-                barrier();
+                __sync_synchronize();
                 if (ctrl_page->delayed_preemption)
                         sched_yield();
         }