[PATCH] Add SWAP_FLAG_DISCARD symbol for older distros.

From: Vinson Lee <[email protected]>

This patch fixes this build error on CentOS 6.

  CC	syscalls/swap.o
syscalls/swap.c:16: error: ‘SWAP_FLAG_DISCARD’ undeclared here (not in a function)

Signed-off-by: Vinson Lee <[email protected]>
---
 include/compat.h |    5 +++++
 syscalls/swap.c  |    1 +
 2 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/include/compat.h b/include/compat.h
index 9d3be59..f392258 100644
--- a/include/compat.h
+++ b/include/compat.h
@@ -862,3 +862,8 @@ struct kvm_get_htab_fd {
 #ifndef SCHED_DEADLINE
 #define SCHED_DEADLINE 6
 #endif
+
+/* sys/swap.h */
+#ifndef SWAP_FLAG_DISCARD
+#define SWAP_FLAG_DISCARD 0x10000
+#endif
diff --git a/syscalls/swap.c b/syscalls/swap.c
index 7eb9d79..c28a54a 100644
--- a/syscalls/swap.c
+++ b/syscalls/swap.c
@@ -3,6 +3,7 @@
  */
 #include <sys/swap.h>
 #include "sanitise.h"
+#include "compat.h"
 
 struct syscallentry syscall_swapon = {
 	.name = "swapon",
-- 
1.7.1