[PATCH 12/28] x86: vdso: Place vdso_data at beginning of vvar page
From: Thomas Weißschuh <hidden>
Date: 2024-10-10 07:02:08
Also in:
linux-arm-kernel, linux-mips, linux-riscv, linux-s390, lkml, loongarch
Subsystem:
the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
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 <redacted>
---
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 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
--
2.47.0