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Mohammed reports (https://bugzilla.kernel.org/show_bug.cgi?id=213029) the commite4ab4658f1("clocksource/drivers/hyper-v: Handle vDSO differences inline") broke vDSO on x86. The problem appears to be that VDSO_CLOCKMODE_HVCLOCK is an enum value in 'enum vdso_clock_mode' and '#ifdef VDSO_CLOCKMODE_HVCLOCK' branch evaluates to false (it is not a define). Use a dedicated HAVE_VDSO_CLOCKMODE_HVCLOCK define instead. Fixes:e4ab4658f1("clocksource/drivers/hyper-v: Handle vDSO differences inline") Reported-by: Mohammed Gamal <[email protected]> Suggested-by: Thomas Gleixner <[email protected]> Signed-off-by: Vitaly Kuznetsov <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Reviewed-by: Michael Kelley <[email protected]> Link: https://lore.kernel.org/r/[email protected]