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Subject[tip:x86/vdso] x86, vdso: Introduce VVAR marco for vdso32
Commit-ID:  995106bc0373be03295aa6e0e380dd33a3a37ea4
Gitweb: http://git.kernel.org/tip/995106bc0373be03295aa6e0e380dd33a3a37ea4
Author: Stefani Seibold <stefani@seibold.net>
AuthorDate: Sun, 16 Feb 2014 22:52:45 +0100
Committer: H. Peter Anvin <hpa@linux.intel.com>
CommitDate: Sun, 16 Feb 2014 15:07:45 -0800

x86, vdso: Introduce VVAR marco for vdso32

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

Signed-off-by: Stefani Seibold <stefani@seibold.net>
Link: http://lkml.kernel.org/r/1392587568-7325-8-git-send-email-stefani@seibold.net
Signed-off-by: H. Peter Anvin <hpa@linux.intel.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) */

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