diff options
Diffstat (limited to 'arch/s390/Kconfig')
| -rw-r--r-- | arch/s390/Kconfig | 36 |
1 files changed, 32 insertions, 4 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 12272361c018..eaaac3788110 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -7,6 +7,10 @@ config MMU bool default y +config ZONE_DMA + bool + default y + config LOCKDEP_SUPPORT bool default y @@ -34,13 +38,12 @@ config GENERIC_HWEIGHT bool default y -config GENERIC_CALIBRATE_DELAY - bool - default y - config GENERIC_TIME def_bool y +config NO_IOMEM + def_bool y + mainmenu "Linux Kernel Configuration" config S390 @@ -134,6 +137,31 @@ 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. + The kernel parameter noexec=on will enable this feature and also + switch the addressing modes, default is disabled. Enabling this (via + kernel parameter) on machines earlier than IBM System z9-109 EC/BC + will reduce system performance. + comment "Code generation options" choice |