linux-kernel - [PATCH v13 7/9] introduce VVAR marco for vdso32

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Date:	Sat,  8 Feb 2014 22:29:09 +0100
From:	stefani@...bold.net
To:	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	x86@...nel.org, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, ak@...ux.intel.com, aarcange@...hat.com,
	john.stultz@...aro.org, luto@...capital.net, xemul@...allels.com,
	gorcunov@...nvz.org, andriy.shevchenko@...ux.intel.com
Cc:	Martin.Runge@...de-schwarz.com, Andreas.Brief@...de-schwarz.com,
	Stefani Seibold <stefani@...bold.net>
Subject: [PATCH v13 7/9] introduce VVAR marco for vdso32

From: Stefani Seibold <stefani@...bold.net>

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

Signed-off-by: Stefani Seibold <stefani@...bold.net>
---
 arch/x86/include/asm/vvar.h | 32 +++++++++++++++++++++-----------
 1 file changed, 21 insertions(+), 11 deletions(-)

diff --git a/arch/x86/include/asm/vvar.h b/arch/x86/include/asm/vvar.h
index 7cd69af..bf13dc5 100644
--- a/arch/x86/include/asm/vvar.h
+++ b/arch/x86/include/asm/vvar.h
@@ -16,15 +16,6 @@
  * you mess up, the linker will catch it.)
  */
 
-/* Base address of vvars.  This is not ABI. */
-#ifdef CONFIG_X86_64
-#define VVAR_ADDRESS (-10*1024*1024 - 4096)
-#else
-extern char __vvar_page;
-
-#define VVAR_ADDRESS (&__vvar_page)
-#endif
-
 #if defined(__VVAR_KERNEL_LDS)
 
 /* The kernel linker script defines its own magic to put vvars in the
@@ -35,16 +26,35 @@ extern char __vvar_page;
 
 #else
 
+#ifdef BUILD_VDSO32
+
+#define DECLARE_VVAR(offset, type, name)				\
+	extern type vvar_ ## name __attribute__((visibility("hidden")));
+
+#define VVAR(name) (vvar_ ## name)
+
+#else
+
+/* Base address of vvars.  This is not ABI. */
+#ifdef CONFIG_X86_64
+#define VVAR_ADDRESS (-10*1024*1024 - 4096)
+#else
+extern char __vvar_page;
+
+#define VVAR_ADDRESS (&__vvar_page)
+#endif
+
 #define DECLARE_VVAR(offset, type, name)				\
 	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) */
-- 
1.8.5.4

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