linux-kernel - [PATCH 2/2] x86_64 vDSO: put vars in .rodata

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Message-Id: <20070924110458.E48994D0325@magilla.localdomain>
Date:	Mon, 24 Sep 2007 04:04:58 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Andi Kleen <ak@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] x86_64 vDSO: put vars in .rodata


This adds a const to the definitions vvar.c makes, so that the vdso_*
variables go into .rodata instead of .data.  This is essentially a cosmetic
change, just giving the section headers in the vDSO file more pleasing flags.
These variables are read-only from the perspective of the vDSO itself and
user mode, even though the contents of the DSO image were adjusted at boot.

Signed-off-by: Roland McGrath <roland@...hat.com>
---
 arch/x86_64/vdso/vvar.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86_64/vdso/vvar.c b/arch/x86_64/vdso/vvar.c
index 6fc2221..1b7e703 100644
--- a/arch/x86_64/vdso/vvar.c
+++ b/arch/x86_64/vdso/vvar.c
@@ -8,5 +8,5 @@
 #include <asm/timex.h>
 #include <asm/vgtod.h>
 
-#define VEXTERN(x) typeof (__ ## x) *vdso_ ## x = (void *)VMAGIC;
+#define VEXTERN(x) typeof (__ ## x) *const vdso_ ## x = (void *)VMAGIC;
 #include "vextern.h"
-
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