warning about spectre with last kernel update

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Bonjour,

I just updated f27 and the new installed kernel
(4.15.3-300.fc27.x86_64), sends these messages at boot time:

kernel: Spectre V2 : Mitigation: Full generic retpoline
kernel: Spectre V2 : System may be vulnerable to spectre v2

What do they mean and what to do? Waiting for next kernel update?

Thank you.

-- 
François Patte
UFR de mathématiques et informatique
Laboratoire CNRS MAP5, UMR 8145
Université Paris Descartes
45, rue des Saints Pères
F-75270 Paris Cedex 06
Tél. +33 (0)6 7892 5822
http://www.math-info.univ-paris5.fr/~patte

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