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[12/28] x86: vdso: Place vdso_data at beginning of vvar page

Message ID 20241010-vdso-generic-base-v1-12-b64f0842d512@linutronix.de (mailing list archive)
State New
Headers show
Series vdso: Preparations for generic data storage | expand

Commit Message

Thomas Weißschuh Oct. 10, 2024, 7:01 a.m. UTC 
The offset of the vdso_data only has historic reasons, as back then
other vvars also existed and offset 0 was already used.
(See commit 8c49d9a74bac ("x86-64: Clean up vdso/kernel shared variables"))
Over time most other vvars got removed and offset 0 is free again.

Moving vdso_data to the beginning of the vvar page aligns x86 with other
architectures and opens up the way for the removal of the custom x86
vvar machinery.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
---
 arch/x86/include/asm/vvar.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/arch/x86/include/asm/vvar.h b/arch/x86/include/asm/vvar.h
index 9d9af37f7cab9e3e6159c0b758e500ddcfc6b3e8..01e60e0f671e9625669dc8fdacf3cdddf8cbf4fb 100644
--- a/arch/x86/include/asm/vvar.h
+++ b/arch/x86/include/asm/vvar.h
@@ -58,7 +58,7 @@  extern char __vvar_page;
 
 /* DECLARE_VVAR(offset, type, name) */
 
-DECLARE_VVAR(128, struct vdso_data, _vdso_data)
+DECLARE_VVAR(0, struct vdso_data, _vdso_data)
 
 #if !defined(_SINGLE_DATA)
 #define _SINGLE_DATA