tree b7fda314933b82d39cb8d30c7882ca3044dd0367
parent 61365e132ef987f7719af5d2e434db4465957637
author Martin Schwidefsky <schwidefsky@de.ibm.com> 1260186703 +0100
committer Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> 1260186693 +0100

[S390] Improve address space mode selection.

Introduce user_mode to replace the two variables switch_amode and
s390_noexec. There are three valid combinations of the old values:
  1) switch_amode == 0 && s390_noexec == 0
  2) switch_amode == 1 && s390_noexec == 0
  3) switch_amode == 1 && s390_noexec == 1
They get replaced by
  1) user_mode == HOME_SPACE_MODE
  2) user_mode == PRIMARY_SPACE_MODE
  3) user_mode == SECONDARY_SPACE_MODE
The new kernel parameter user_mode=[primary,secondary,home] lets
you choose the address space mode the user space processes should
use. In addition the CONFIG_S390_SWITCH_AMODE config option
is removed.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>