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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2018-04-27 07:36:51 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-04-29 07:50:03 +0200 |
| commit | 76c45c1be03c60f9d983aed017182760dbd8bbf9 (patch) | |
| tree | 1af5a6ee625b9109c102ebef0c255733fa313817 /arch/s390/kernel/processor.c | |
| parent | bc650e567c9997293ed6421a058517e270d77e4c (diff) | |
s390: add options to change branch prediction behaviour for the kernel
[ Upstream commit d768bd892fc8f066cd3aa000eb1867bcf32db0ee ]
Add the PPA instruction to the system entry and exit path to switch
the kernel to a different branch prediction behaviour. The instructions
are added via CPU alternatives and can be disabled with the "nospec"
or the "nobp=0" kernel parameter. If the default behaviour selected
with CONFIG_KERNEL_NOBP is set to "n" then the "nobp=1" parameter can be
used to enable the changed kernel branch prediction.
Acked-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/s390/kernel/processor.c')
0 files changed, 0 insertions, 0 deletions