The following commit has been merged into the timers/vdso branch of tip:
Commit-ID: a91ed80e570892b0df6702e8664e89ff8a6964b1
Gitweb: https://git.kernel.org/tip/a91ed80e570892b0df6702e8664e89ff8a6964b1
Author: Thomas Weißschuh <thomas.weissschuh@xxxxxxxxxxxxx>
AuthorDate: Thu, 10 Oct 2024 09:01:15 +02:00
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitterDate: Sat, 02 Nov 2024 11:05:14 +01:00
x86/vdso: Access rng data from kernel without vvar
Remove the usage of the vvar _vdso_rng_data from the kernel-space code,
as the x86 vvar machinery is about to be removed.
The definition of the structure is unnecessary, as the data lives in a
page pre-allocated by the linker anyways.
The vdso user-space access to the rng data will be switched soon.
DEFINE_VVAR_SINGLE() is now unused. It will be removed later togehter
with the rest of vvar.h.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@xxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/all/20241010-vdso-generic-base-v1-13-b64f0842d512@xxxxxxxxxxxxx
---
arch/x86/entry/vdso/vma.c | 1 -
arch/x86/include/asm/vdso/vsyscall.h | 2 +-
arch/x86/include/asm/vvar.h | 4 +++-
3 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/arch/x86/entry/vdso/vma.c b/arch/x86/entry/vdso/vma.c
index b8fed8b..8437906 100644
--- a/arch/x86/entry/vdso/vma.c
+++ b/arch/x86/entry/vdso/vma.c
@@ -39,7 +39,6 @@ struct vdso_data *arch_get_vdso_data(void *vvar_page)
#undef EMIT_VVAR
DEFINE_VVAR(struct vdso_data, _vdso_data);
-DEFINE_VVAR_SINGLE(struct vdso_rng_data, _vdso_rng_data);
unsigned int vclocks_used __read_mostly;
diff --git a/arch/x86/include/asm/vdso/vsyscall.h b/arch/x86/include/asm/vdso/vsyscall.h
index a1f916b..ce8d5c8 100644
--- a/arch/x86/include/asm/vdso/vsyscall.h
+++ b/arch/x86/include/asm/vdso/vsyscall.h
@@ -21,7 +21,7 @@ struct vdso_data *__x86_get_k_vdso_data(void)
static __always_inline
struct vdso_rng_data *__x86_get_k_vdso_rng_data(void)
{
- return &_vdso_rng_data;
+ return (void *)&__vvar_page + __VDSO_RND_DATA_OFFSET;
}
#define __arch_get_k_vdso_rng_data __x86_get_k_vdso_rng_data
diff --git a/arch/x86/include/asm/vvar.h b/arch/x86/include/asm/vvar.h
index 01e60e0..fe3434d 100644
--- a/arch/x86/include/asm/vvar.h
+++ b/arch/x86/include/asm/vvar.h
@@ -19,6 +19,8 @@
#ifndef _ASM_X86_VVAR_H
#define _ASM_X86_VVAR_H
+#define __VDSO_RND_DATA_OFFSET 640
+
#ifdef EMIT_VVAR
/*
* EMIT_VVAR() is used by the kernel linker script to put vvars in the
@@ -62,7 +64,7 @@ DECLARE_VVAR(0, struct vdso_data, _vdso_data)
#if !defined(_SINGLE_DATA)
#define _SINGLE_DATA
-DECLARE_VVAR_SINGLE(640, struct vdso_rng_data, _vdso_rng_data)
+DECLARE_VVAR_SINGLE(__VDSO_RND_DATA_OFFSET, struct vdso_rng_data, _vdso_rng_data)
#endif
#undef DECLARE_VVAR
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