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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2009-12-07 11:51:43 (GMT) |
|---|---|---|
| committer | Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2009-12-07 11:51:33 (GMT) |
| commit | b11b53342773361f3353b285eb6a3fd6074e7997 (patch) | |
| tree | b7fda314933b82d39cb8d30c7882ca3044dd0367 /arch/s390/Kconfig | |
| parent | 61365e132ef987f7719af5d2e434db4465957637 (diff) | |
| download | linux-b11b53342773361f3353b285eb6a3fd6074e7997.tar.xz | |
[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>
Diffstat (limited to 'arch/s390/Kconfig')
| -rw-r--r-- | arch/s390/Kconfig | 15 |
1 files changed, 0 insertions, 15 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 16c6730..c802352 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -220,23 +220,8 @@ config AUDIT_ARCH bool default y -config S390_SWITCH_AMODE - bool "Switch kernel/user addressing modes" - help - This option allows to switch the addressing modes of kernel and user - space. The kernel parameter switch_amode=on will enable this feature, - default is disabled. Enabling this (via kernel parameter) on machines - earlier than IBM System z9-109 EC/BC will reduce system performance. - - Note that this option will also be selected by selecting the execute - protection option below. Enabling the execute protection via the - noexec kernel parameter will also switch the addressing modes, - independent of the switch_amode kernel parameter. - - config S390_EXEC_PROTECT bool "Data execute protection" - select S390_SWITCH_AMODE help This option allows to enable a buffer overflow protection for user space programs and it also selects the addressing mode option above. |