s390/uaccess: introduce bit field for OAC specifier

Previously, we've used  magic values to specify the OAC
(operand-access control) for mvcos.

Instead we introduce a bit field for it.

When using a bit field, we cannot use an immediate value with K
constraint anymore, since GCC older than 10 doesn't recognize
the bit field union as a compile time constant.
To make things work with older compilers,
load the OAC value through a register.

Bloat-o-meter reports a slight increase in kernel size with this change:
Total: Before=15692135, After=15693015, chg +0.01%

Signed-off-by: Nico Boehr <[email protected]>
Co-developed-by: Janis Schoetterl-Glausch <[email protected]>
Signed-off-by: Janis Schoetterl-Glausch <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Cc: Alexander Gordeev <[email protected]>
Cc: Christian Borntraeger <[email protected]>
Cc: Vasily Gorbik <[email protected]>
Cc: Sven Schnelle <[email protected]>
Signed-off-by: Heiko Carstens <[email protected]>

0 files changed, 0 insertions, 0 deletions