vdso: Remove remnants of architecture-specific time storage

All users of the time releated parts of the vDSO are now using the generic
storage implementation. Remove the therefore unnecessary compatibility
accessor functions and symbols.

Co-developed-by: Nam Cao <namcao@linutronix.de>
Signed-off-by: Nam Cao <namcao@linutronix.de>
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250204-vdso-store-rng-v3-18-13a4669dfc8c@linutronix.de

4 files changed, 9 insertions, 41 deletions

diff --git a/include/asm-generic/vdso/vsyscall.h b/include/asm-generic/vdso/vsyscall.h
index 13e2ac3736ee..1fb3000f5036 100644
--- a/include/asm-generic/vdso/vsyscall.h
+++ b/include/asm-generic/vdso/vsyscall.h
@@ -20,31 +20,19 @@ static __always_inline const struct vdso_rng_data *__arch_get_vdso_u_rng_data(vo
 }
 #endif
 
-#else  /* !CONFIG_GENERIC_VDSO_DATA_STORE */
-
-#ifndef __arch_get_k_vdso_data
-static __always_inline struct vdso_data *__arch_get_k_vdso_data(void)
-{
-	return NULL;
-}
-#endif /* __arch_get_k_vdso_data */
-#define vdso_k_time_data __arch_get_k_vdso_data()
-
-#define __arch_get_vdso_u_time_data __arch_get_vdso_data
-
 #endif /* CONFIG_GENERIC_VDSO_DATA_STORE */
 
 #ifndef __arch_update_vsyscall
-static __always_inline void __arch_update_vsyscall(struct vdso_data *vdata)
+static __always_inline void __arch_update_vsyscall(struct vdso_time_data *vdata)
 {
 }
 #endif /* __arch_update_vsyscall */
 
-#ifndef __arch_sync_vdso_data
-static __always_inline void __arch_sync_vdso_data(struct vdso_data *vdata)
+#ifndef __arch_sync_vdso_time_data
+static __always_inline void __arch_sync_vdso_time_data(struct vdso_time_data *vdata)
 {
 }
-#endif /* __arch_sync_vdso_data */
+#endif /* __arch_sync_vdso_time_data */
 
 #endif /* !__ASSEMBLY__ */
 
diff --git a/include/linux/time_namespace.h b/include/linux/time_namespace.h
index 4b81db223f54..0b8b32bf0655 100644
--- a/include/linux/time_namespace.h
+++ b/include/linux/time_namespace.h
@@ -8,7 +8,6 @@
 #include <linux/ns_common.h>
 #include <linux/err.h>
 #include <linux/time64.h>
-#include <vdso/datapage.h>
 
 struct user_namespace;
 extern struct user_namespace init_user_ns;
@@ -166,6 +165,4 @@ static inline ktime_t timens_ktime_to_host(clockid_t clockid, ktime_t tim)
 }
 #endif
 
-struct vdso_data *arch_get_vdso_data(void *vvar_page);
-
 #endif /* _LINUX_TIMENS_H */
diff --git a/include/vdso/datapage.h b/include/vdso/datapage.h
index 497907c3aa11..ed4fb4c06e3e 100644
--- a/include/vdso/datapage.h
+++ b/include/vdso/datapage.h
@@ -128,8 +128,6 @@ struct vdso_time_data {
 	struct arch_vdso_time_data arch_data;
 };
 
-#define vdso_data vdso_time_data
-
 /**
  * struct vdso_rng_data - vdso RNG state information
  * @generation:	counter representing the number of RNG reseeds
@@ -149,10 +147,7 @@ struct vdso_rng_data {
  * With the hidden visibility, the compiler simply generates a PC-relative
  * relocation, and this is what we need.
  */
-#ifndef CONFIG_GENERIC_VDSO_DATA_STORE
-extern struct vdso_time_data _vdso_data[CS_BASES] __attribute__((visibility("hidden")));
-extern struct vdso_time_data _timens_data[CS_BASES] __attribute__((visibility("hidden")));
-#else
+#ifdef CONFIG_GENERIC_VDSO_DATA_STORE
 extern struct vdso_time_data vdso_u_time_data[CS_BASES] __attribute__((visibility("hidden")));
 extern struct vdso_rng_data vdso_u_rng_data __attribute__((visibility("hidden")));
 extern struct vdso_arch_data vdso_u_arch_data __attribute__((visibility("hidden")));
@@ -160,17 +155,6 @@ extern struct vdso_arch_data vdso_u_arch_data __attribute__((visibility("hidden"
 extern struct vdso_time_data *vdso_k_time_data;
 extern struct vdso_rng_data *vdso_k_rng_data;
 extern struct vdso_arch_data *vdso_k_arch_data;
-#endif
-
-/**
- * union vdso_data_store - Generic vDSO data page
- */
-union vdso_data_store {
-	struct vdso_time_data	data[CS_BASES];
-	u8			page[1U << CONFIG_PAGE_SHIFT];
-};
-
-#ifdef CONFIG_GENERIC_VDSO_DATA_STORE
 
 #define VDSO_ARCH_DATA_SIZE ALIGN(sizeof(struct vdso_arch_data), PAGE_SIZE)
 #define VDSO_ARCH_DATA_PAGES (VDSO_ARCH_DATA_SIZE >> PAGE_SHIFT)
@@ -189,7 +173,6 @@ enum vdso_pages {
 /*
  * The generic vDSO implementation requires that gettimeofday.h
  * provides:
- * - __arch_get_vdso_data(): to get the vdso datapage.
  * - __arch_get_hw_counter(): to get the hw counter based on the
  *   clock_mode.
  * - gettimeofday_fallback(): fallback for gettimeofday.
diff --git a/include/vdso/helpers.h b/include/vdso/helpers.h
index 3ddb03bb05cb..41c3087070c7 100644
--- a/include/vdso/helpers.h
+++ b/include/vdso/helpers.h
@@ -7,7 +7,7 @@
 #include <asm/barrier.h>
 #include <vdso/datapage.h>
 
-static __always_inline u32 vdso_read_begin(const struct vdso_data *vd)
+static __always_inline u32 vdso_read_begin(const struct vdso_time_data *vd)
 {
 	u32 seq;
 
@@ -18,7 +18,7 @@ static __always_inline u32 vdso_read_begin(const struct vdso_data *vd)
 	return seq;
 }
 
-static __always_inline u32 vdso_read_retry(const struct vdso_data *vd,
+static __always_inline u32 vdso_read_retry(const struct vdso_time_data *vd,
 					   u32 start)
 {
 	u32 seq;
@@ -28,7 +28,7 @@ static __always_inline u32 vdso_read_retry(const struct vdso_data *vd,
 	return seq != start;
 }
 
-static __always_inline void vdso_write_begin(struct vdso_data *vd)
+static __always_inline void vdso_write_begin(struct vdso_time_data *vd)
 {
 	/*
 	 * WRITE_ONCE() is required otherwise the compiler can validly tear
@@ -40,7 +40,7 @@ static __always_inline void vdso_write_begin(struct vdso_data *vd)
 	smp_wmb();
 }
 
-static __always_inline void vdso_write_end(struct vdso_data *vd)
+static __always_inline void vdso_write_end(struct vdso_time_data *vd)
 {
 	smp_wmb();
 	/*