From: Paolo 'Blaisorblade' Giarrusso This config option was lost during the creation of lib/Kconfig.debug, due to a bad expressed dependency; I also moved the option back to its original place for UML (it is near CONFIG_MCONSOLE since it depends on that). Signed-off-by: Paolo 'Blaisorblade' Giarrusso Signed-off-by: Andrew Morton --- 25-akpm/arch/um/Kconfig | 19 +++++++++++++++++++ 25-akpm/lib/Kconfig.debug | 1 - 2 files changed, 19 insertions(+), 1 deletion(-) diff -puN arch/um/Kconfig~uml-readd-config_magic_sysrq-for-uml arch/um/Kconfig --- 25/arch/um/Kconfig~uml-readd-config_magic_sysrq-for-uml Thu Jan 13 15:27:05 2005 +++ 25-akpm/arch/um/Kconfig Thu Jan 13 15:27:05 2005 @@ -145,6 +145,25 @@ config MCONSOLE It is safe to say 'Y' here. +config MAGIC_SYSRQ + bool "Magic SysRq key" + depends on MCONSOLE + ---help--- + If you say Y here, you will have some control over the system even + if the system crashes for example during kernel debugging (e.g., you + will be able to flush the buffer cache to disk, reboot the system + immediately or dump some status information). A key for each of the + possible requests is provided. + + This is the feature normally accomplished by pressing a key + while holding SysRq (Alt+PrintScreen). + + On UML, this is accomplished by sending a "sysrq" command with + mconsole, followed by the letter for the requested command. + + The keys are documented in . Don't say Y + unless you really know what this hack does. + config HOST_2G_2G bool "2G/2G host address space split" default n diff -puN lib/Kconfig.debug~uml-readd-config_magic_sysrq-for-uml lib/Kconfig.debug --- 25/lib/Kconfig.debug~uml-readd-config_magic_sysrq-for-uml Thu Jan 13 15:27:05 2005 +++ 25-akpm/lib/Kconfig.debug Thu Jan 13 15:27:05 2005 @@ -23,7 +23,6 @@ config MAGIC_SYSRQ config MAGIC_SYSRQ bool "Magic SysRq key" depends on DEBUG_KERNEL && (H8300 || M68KNOMMU || V850) - depends (USERMODE && MCONSOLE) help Enables console device to interpret special characters as commands to dump state information. _