folly: fix sysMembarrier() with newer kernel headers

Summary:
When __NR_membarrier is defined (on newer kernels),
we don't define the constants, but also by default
don't include the membarrier header to define the necessary constants.
Therefore split the definition of the syscall value and
the constants used with it, to ensure both are defined.

Reviewed By: yfeldblum

Differential Revision: D6292178

fbshipit-source-id: 31ba9d4a698a4f5e14ae34de0acf8f851d75527d

diff --git a/folly/portability/SysMembarrier.cpp b/folly/portability/SysMembarrier.cpp
index ba1774da12be65054b4e36dd66da03aaa3d4f8c7..9b3735c965603e8cbfa985aa7f4566522191b820 100644 (file)
--- a/folly/portability/SysMembarrier.cpp
+++ b/folly/portability/SysMembarrier.cpp
@@ -26,10 +26,12 @@
 #define FOLLY_USE_SYS_MEMBARRIER 1
 #if !defined(__NR_membarrier)
 #define __NR_membarrier 324
+#endif
+#if FOLLY_HAVE_LINUX_MEMBARRIER_H
+#include <linux/membarrier.h> // @manual
+#else
 #define MEMBARRIER_CMD_QUERY 0
 #define MEMBARRIER_CMD_SHARED 1
-#elif FOLLY_HAVE_LINUX_MEMBARRIER_H
-#include <linux/membarrier.h> // @manual
 #endif
 #endif