linux-kernel - [tip: timers/vdso] x86/vdso: Place vdso

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Message-ID: <173054221333.3137.14702727295718131881.tip-bot2@tip-bot2>
Date: Sat, 02 Nov 2024 10:10:13 -0000
From:
 tip-bot2 for Thomas Weißschuh <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: thomas.weissschuh@...utronix.de, Thomas Gleixner <tglx@...utronix.de>,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject:
 [tip: timers/vdso] x86/vdso: Place vdso_data at beginning of vvar page

The following commit has been merged into the timers/vdso branch of tip:

Commit-ID:     89f40a2d3c3d91c5796b247d930a6855c3ecb116
Gitweb:        https://git.kernel.org/tip/89f40a2d3c3d91c5796b247d930a6855c3ecb116
Author:        Thomas Weißschuh <thomas.weissschuh@...utronix.de>
AuthorDate:    Thu, 10 Oct 2024 09:01:14 +02:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Sat, 02 Nov 2024 11:05:14 +01:00

x86/vdso: Place vdso_data at beginning of vvar page

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@...utronix.de>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Link: https://lore.kernel.org/all/20241010-vdso-generic-base-v1-12-b64f0842d512@linutronix.de

---
 arch/x86/include/asm/vvar.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/vvar.h b/arch/x86/include/asm/vvar.h
index 9d9af37..01e60e0 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