commit 3e17958c6b3159cebc09f24344176e9a12b15e30
author Martin Schwidefsky <schwidefsky@de.ibm.com> Fri Apr 27 07:36:53 2018 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> Sun Apr 29 11:31:59 2018 +0200
tree 3778607d6f0338c5df36a5ba9e1b8f4c982de329
parent 2afb4e9dfc0a44a4b616e4461fbf972e5ad4b0fe

s390: add automatic detection of the spectre defense

[ Upstream commit 6e179d64126b909f0b288fa63cdbf07c531e9b1d ]

Automatically decide between nobp vs. expolines if the spectre_v2=auto
kernel parameter is specified or CONFIG_EXPOLINE_AUTO=y is set.

The decision made at boot time due to CONFIG_EXPOLINE_AUTO=y being set
can be overruled with the nobp, nospec and spectre_v2 kernel parameters.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>