[linux-yocto] [PATCH 10/13] x86, vdso: Introduce VVAR marco for vdso32

[jianchuan.wang at windriver.com]

From: Stefani Seibold <stefani at seibold.net>

commit ef721987aef0cc0abba08c88810f2155f76b0b1f upstream

This patch revamps the vvar.h for introduce the VVAR macro for vdso32.

Reviewed-by: Andy Lutomirski <luto at amacapital.net>
Signed-off-by: Stefani Seibold <stefani at seibold.net>
Link: http://lkml.kernel.org/r/1395094933-14252-8-git-send-email-stefani@seibold.net
Signed-off-by: H. Peter Anvin <hpa at linux.intel.com>
Signed-off-by: Jianchuan Wang <jianchuan.wang at windriver.com>
---
 arch/x86/include/asm/vvar.h |   14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/vvar.h b/arch/x86/include/asm/vvar.h
index 0a534ea..52c79ff 100644
--- a/arch/x86/include/asm/vvar.h
+++ b/arch/x86/include/asm/vvar.h
@@ -26,6 +26,15 @@
 
 #else
 
+#ifdef BUILD_VDSO32
+
+#define DECLARE_VVAR(offset, type, name)				\
+	extern type vvar_ ## name __attribute__((visibility("hidden")));
+
+#define VVAR(name) (vvar_ ## name)
+
+#else
+
 extern char __vvar_page;
 
 /* Base address of vvars.  This is not ABI. */
@@ -39,12 +48,13 @@ extern char __vvar_page;
 	static type const * const vvaraddr_ ## name =			\
 		(void *)(VVAR_ADDRESS + (offset));
 
+#define VVAR(name) (*vvaraddr_ ## name)
+#endif
+
 #define DEFINE_VVAR(type, name)						\
 	type name							\
 	__attribute__((section(".vvar_" #name), aligned(16))) __visible
 
-#define VVAR(name) (*vvaraddr_ ## name)
-
 #endif
 
 /* DECLARE_VVAR(offset, type, name) */
-- 
1.7.9.5