The following commit has been merged into the timers/vdso branch of tip:
Commit-ID: 7d4acbae2aca16eb269ade9078b7ebad729e27ea
Gitweb: https://git.kernel.org/tip/7d4acbae2aca16eb269ade9078b7ebad729e27ea
Author: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
AuthorDate: Thu, 10 Oct 2024 09:01:20 +02:00
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Sat, 02 Nov 2024 12:37:34 +01:00
x86/vdso: Access vdso data without vvar.h
The vdso_data is at the start of the vvar page.
Make use of this invariant to remove the usage of vvar.h.
This also matches the logic for the timens data.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20241010-vdso-generic-base-v1-18-b64f0842d512@linutronix.de
---
arch/x86/entry/vdso/vdso-layout.lds.S | 5 -----
arch/x86/include/asm/vdso/gettimeofday.h | 6 +++---
2 files changed, 3 insertions(+), 8 deletions(-)
diff --git a/arch/x86/entry/vdso/vdso-layout.lds.S b/arch/x86/entry/vdso/vdso-layout.lds.S
index c7e194b..9e602c0 100644
--- a/arch/x86/entry/vdso/vdso-layout.lds.S
+++ b/arch/x86/entry/vdso/vdso-layout.lds.S
@@ -20,11 +20,6 @@ SECTIONS
vvar_start = . - 4 * PAGE_SIZE;
vvar_page = vvar_start;
- /* Place all vvars at the offsets in asm/vvar.h. */
-#define EMIT_VVAR(name, offset) vvar_ ## name = vvar_page + offset;
-#include <asm/vvar.h>
-#undef EMIT_VVAR
-
vdso_rng_data = vvar_page + __VDSO_RND_DATA_OFFSET;
pvclock_page = vvar_start + PAGE_SIZE;
diff --git a/arch/x86/include/asm/vdso/gettimeofday.h b/arch/x86/include/asm/vdso/gettimeofday.h
index 1e61161..375a34b 100644
--- a/arch/x86/include/asm/vdso/gettimeofday.h
+++ b/arch/x86/include/asm/vdso/gettimeofday.h
@@ -14,13 +14,13 @@
#include <uapi/linux/time.h>
#include <asm/vgtod.h>
-#include <asm/vvar.h>
#include <asm/unistd.h>
#include <asm/msr.h>
#include <asm/pvclock.h>
#include <clocksource/hyperv_timer.h>
-#define __vdso_data (VVAR(_vdso_data))
+extern struct vdso_data vvar_page
+ __attribute__((visibility("hidden")));
extern struct vdso_data timens_page
__attribute__((visibility("hidden")));
@@ -277,7 +277,7 @@ static inline u64 __arch_get_hw_counter(s32 clock_mode,
static __always_inline const struct vdso_data *__arch_get_vdso_data(void)
{
- return __vdso_data;
+ return &vvar_page;
}
static inline bool arch_vdso_clocksource_ok(const struct vdso_data *vd)