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2024-12-19 9370bb92b2d16684ee45cf24e879c93c509162da

 kernel/arch/arm64/include/asm/vdso/gettimeofday.h
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@@ -7,13 +7,10 @@
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 #ifndef __ASSEMBLY__
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+#include <asm/barrier.h>
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 #include <asm/unistd.h>
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-#define __VDSO_USE_SYSCALL		ULLONG_MAX
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-
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 #define VDSO_HAS_CLOCK_GETRES		1
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-
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-#define VDSO_HAS_TIME			1
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 static __always_inline
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 int gettimeofday_fallback(struct __kernel_old_timeval *_tv,
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@@ -67,16 +64,18 @@
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 	return ret;
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 }
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-static __always_inline u64 __arch_get_hw_counter(s32 clock_mode)
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+static __always_inline u64 __arch_get_hw_counter(s32 clock_mode,
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+						 const struct vdso_data *vd)
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 {
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 	u64 res;
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 	/*
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-	 * clock_mode == 0 implies that vDSO are enabled otherwise
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-	 * fallback on syscall.
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+	 * Core checks for mode already, so this raced against a concurrent
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+	 * update. Return something. Core will do another round and then
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+	 * see the mode change and fallback to the syscall.
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 	 */
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-	if (clock_mode)
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-		return __VDSO_USE_SYSCALL;
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+	if (clock_mode == VDSO_CLOCKMODE_NONE)
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+		return 0;
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 	/*
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 	 * This isb() is required to prevent that the counter value
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@@ -84,11 +83,7 @@
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 	 */
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 	isb();
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 	asm volatile("mrs %0, cntvct_el0" : "=r" (res) :: "memory");
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-	/*
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-	 * This isb() is required to prevent that the seq lock is
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-	 * speculated.#
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-	 */
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-	isb();
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+	arch_counter_enforce_ordering(res);
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 	return res;
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 }
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@@ -99,6 +94,14 @@
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 	return _vdso_data;
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 }
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+#ifdef CONFIG_TIME_NS
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+static __always_inline
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+const struct vdso_data *__arch_get_timens_vdso_data(void)
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+{
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+	return _timens_data;
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+}
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+#endif
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+
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 #endif /* !__ASSEMBLY__ */
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 #endif /* __ASM_VDSO_GETTIMEOFDAY_H */