s390/ctlreg: allow to call system_ctl_set/clear_bit() early

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Allow to call system_ctl_set_bit() and system_clt_clear_bit() early, so
that users do not have to take care when the control register save area
has been initialized. Users are supposed to use system_ctl_set_bit() and
system:clt_clear_bit() for all control register changes which are supposed
to be seen globally.

Depending on the system state such calls will change:

- local control register contents
- save area and local control register contents
- save area and global control register contents

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

...

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Heiko Carstens 2023-09-11 21:40:06 +02:00 • committed by Vasily Gorbik

parent d11d5c8c84

commit cce2c8606f

1 changed files with 34 additions and 7 deletions

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arch/s390/kernel/ctlreg.c

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