On Thu, May 13, 2021 at 01:29:12PM +0000, Michael Kelley wrote:

From: Vitaly Kuznetsov <vkuznets@redhat.com> Sent: Thursday, May 13, 2021 12:33 AM

quoted

Mohammed reports (https://bugzilla.kernel.org/show_bug.cgi?id=213029)
the commit e4ab4658f1cf ("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.

Suggested-by: Thomas Gleixner <redacted>
Reported-by: Mohammed Gamal <redacted>
Fixes: e4ab4658f1cf ("clocksource/drivers/hyper-v: Handle vDSO differences inline")
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>

[...]

Reviewed-by: Michael Kelley <redacted>

Applied to hyperv-fixes. Thanks.