[4.15 & 4.14 stable 10/12] x86/microcode: Synchronize late microcode loading

commit a5321aec6412b20b5ad15db2d6b916c05349dbff upstream Original idea by Ashok, completely rewritten by Borislav. Before you read any further: the early loading method is still the preferred one and you should always do that. The following patch is improving the late loading mechanism for long

[4.15 & 4.14 stable 10/12] x86/microcode: Synchronize late microcode loading

commit a5321aec6412b20b5ad15db2d6b916c05349dbff upstream Original idea by Ashok, completely rewritten by Borislav. Before you read any further: the early loading method is still the preferred one and you should always do that. The following patch is improving the late loading mechanism for long