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Auxiliary clocks will have their vDSO data in a dedicated 'struct vdso_clock', which needs to be synchronized independently. Add a helper to synchronize a single vDSO clock. [ tglx: Move the SMP memory barriers to the call sites and get rid of the confusing first/last arguments and conditional barriers ] Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/all/20250701-vdso-auxclock-v1-4-df7d9f87b9b8@linutronix.de