linux-kernel - [tip:x86/vdso] x86, vdso: Introduce VVAR marco for vdso32

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Message-ID: <tip-47ffeb5bae376766da7f4a326f13e980a280338b@git.kernel.org>
Date:	Wed, 5 Mar 2014 14:31:42 -0800
From:	tip-bot for Stefani Seibold <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, luto@...capital.net, hpa@...or.com,
	mingo@...nel.org, stefani@...bold.net, tglx@...utronix.de,
	hpa@...ux.intel.com
Subject: [tip:x86/vdso] x86, vdso: Introduce VVAR marco for vdso32

Commit-ID:  47ffeb5bae376766da7f4a326f13e980a280338b
Gitweb:     http://git.kernel.org/tip/47ffeb5bae376766da7f4a326f13e980a280338b
Author:     Stefani Seibold <stefani@...bold.net>
AuthorDate: Mon, 3 Mar 2014 22:12:18 +0100
Committer:  H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Wed, 5 Mar 2014 14:02:38 -0800

x86, vdso: Introduce VVAR marco for vdso32

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

Reviewed-by: Andy Lutomirski <luto@...capital.net>
Signed-off-by: Stefani Seibold <stefani@...bold.net>
Link: http://lkml.kernel.org/r/1393881143-3569-8-git-send-email-stefani@seibold.net
Signed-off-by: H. Peter Anvin <hpa@...ux.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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