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The Linux kernel configuration item CONFIG_MAGIC_SYSRQ
has multiple definitions:
lib/Kconfig.debug
The configuration item CONFIG_MAGIC_SYSRQ:
! CONFIG_UML
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). This is accomplished by pressing various keys while holding SysRq (Alt+PrintScreen). It also works on a serial console (on PC hardware at least), if you send a BREAK and then within 5 seconds a command keypress. The keys are documented in Documentation/admin-guide/sysrq.rst. Don't say Y unless you really know what this hack does.
arch/um/Kconfig
The configuration item CONFIG_MAGIC_SYSRQ:
CONFIG_MCONSOLE
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 Documentation/admin-guide/sysrq.rst. Don't say Y unless you really know what this hack does.
arch/um/Kconfig.um
The configuration item CONFIG_MAGIC_SYSRQ:
CONFIG_MCONSOLE
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 Documentation/admin-guide/sysrq.rst. Don't say Y unless you really know what this hack does.
arch/frv/Kconfig
The configuration item CONFIG_MAGIC_SYSRQ:
CONFIG_DEBUG_KERNEL
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). This is accomplished by pressing various keys while holding SysRq (Alt+PrintScreen). It also works on a serial console (on PC hardware at least), if you send a BREAK and then within 5 seconds a command keypress. The keys are documented in Documentation/sysrq.txt. Don't say Y unless you really know what this hack does.
arch/m32r/Kconfig
The configuration item CONFIG_MAGIC_SYSRQ:
CONFIG_DEBUG_KERNEL
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). This is accomplished by pressing various keys while holding SysRq (Alt+PrintScreen). It also works on a serial console (on PC hardware at least), if you send a BREAK and then within 5 seconds a command keypress. The keys are documented in Documentation/sysrq.txt. Don't say Y unless you really know what this hack does.
arch/x86_64/Kconfig
The configuration item CONFIG_MAGIC_SYSRQ:
(none)
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). This is accomplished by pressing various keys while holding SysRq (Alt+PrintScreen). It also works on a serial console (on PC hardware at least), if you send a BREAK and then within 5 seconds a command keypress. The keys are documented in Documentation/sysrq.txt. Don't say Y unless you really know what this hack does.
arch/v850/Kconfig
The configuration item CONFIG_MAGIC_SYSRQ:
CONFIG_DEBUG_KERNEL
Enables console device to interprent special characters as commands to dump state information.
arch/sparc64/Kconfig
The configuration item CONFIG_MAGIC_SYSRQ:
CONFIG_DEBUG_KERNEL
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). This is accomplished by pressing various keys while holding SysRq (Alt+PrintScreen). It also works on a serial console (on PC hardware at least), if you send a BREAK and then within 5 seconds a command keypress. The keys are documented in Documentation/sysrq.txt. Don't say Y unless you really know what this hack does.
arch/sparc/Kconfig
The configuration item CONFIG_MAGIC_SYSRQ:
CONFIG_DEBUG_KERNEL
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). This is accomplished by pressing various keys while holding SysRq (Alt+PrintScreen). It also works on a serial console (on PC hardware at least), if you send a BREAK and then within 5 seconds a command keypress. The keys are documented in Documentation/sysrq.txt. Don't say Y unless you really know what this hack does.
arch/sh64/Kconfig
The configuration item CONFIG_MAGIC_SYSRQ:
(none)
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). This is accomplished by pressing various keys while holding SysRq (Alt+PrintScreen). It also works on a serial console (on PC hardware at least), if you send a BREAK and then within 5 seconds a command keypress. The keys are documented in Documentation/sysrq.txt. Don't say Y unless you really know what this hack does.
arch/sh/Kconfig
The configuration item CONFIG_MAGIC_SYSRQ:
(none)
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). This is accomplished by pressing various keys while holding SysRq (Alt+PrintScreen). It also works on a serial console (on PC hardware at least), if you send a BREAK and then within 5 seconds a command keypress. The keys are documented in Documentation/sysrq.txt. Don't say Y unless you really know what this hack does.
arch/s390/Kconfig
The configuration item CONFIG_MAGIC_SYSRQ:
CONFIG_DEBUG_KERNEL
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). This is accomplished by pressing various keys while holding SysRq (Alt+PrintScreen). It also works on a serial console (on PC hardware at least), if you send a BREAK and then within 5 seconds a command keypress. The keys are documented in Documentation/sysrq.txt. Don't say Y unless you really know what this hack does.
arch/ppc64/Kconfig
The configuration item CONFIG_MAGIC_SYSRQ:
CONFIG_DEBUG_KERNEL
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). This is accomplished by pressing various keys while holding SysRq (Alt+PrintScreen). It also works on a serial console (on PC hardware at least), if you send a BREAK and then within 5 seconds a command keypress. The keys are documented in Documentation/sysrq.txt. Don't say Y unless you really know what this hack does.
arch/ppc/Kconfig
The configuration item CONFIG_MAGIC_SYSRQ:
CONFIG_DEBUG_KERNEL
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). This is accomplished by pressing various keys while holding SysRq (Alt+PrintScreen). It also works on a serial console (on PC hardware at least), if you send a BREAK and then within 5 seconds a command keypress. The keys are documented in Documentation/sysrq.txt. Don't say Y unless you really know what this hack does.
arch/parisc/Kconfig
The configuration item CONFIG_MAGIC_SYSRQ:
CONFIG_DEBUG_KERNEL
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). This is accomplished by pressing various keys while holding SysRq (Alt+PrintScreen). It also works on a serial console (on PC hardware at least), if you send a BREAK and then within 5 seconds a command keypress. The keys are documented in Documentation/sysrq.txt. Don't say Y unless you really know what this hack does.
arch/mips/Kconfig
The configuration item CONFIG_MAGIC_SYSRQ:
CONFIG_DEBUG_KERNEL
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). This is accomplished by pressing various keys while holding SysRq (Alt+PrintScreen). It also works on a serial console (on PC hardware at least), if you send a BREAK and then within 5 seconds a command keypress. The keys are documented in Documentation/sysrq.txt. Don't say Y unless you really know what this hack does.
arch/m68knommu/Kconfig
The configuration item CONFIG_MAGIC_SYSRQ:
(none)
Enables console device to interpret special characters as commands to dump state information.
arch/m68k/Kconfig
The configuration item CONFIG_MAGIC_SYSRQ:
CONFIG_DEBUG_KERNEL
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). This is accomplished by pressing various keys while holding SysRq (Alt+PrintScreen). It also works on a serial console (on PC hardware at least), if you send a BREAK and then within 5 seconds a command keypress. The keys are documented in Documentation/sysrq.txt. Don't say Y unless you really know what this hack does.
arch/ia64/Kconfig
The configuration item CONFIG_MAGIC_SYSRQ:
CONFIG_DEBUG_KERNEL
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). This is accomplished by pressing various keys while holding SysRq (Alt+PrintScreen). It also works on a serial console (on PC hardware at least), if you send a BREAK and then within 5 seconds a command keypress. The keys are documented in Documentation/sysrq.txt. Don't say Y unless you really know what this hack does.
arch/i386/Kconfig
The configuration item CONFIG_MAGIC_SYSRQ:
CONFIG_DEBUG_KERNEL
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). This is accomplished by pressing various keys while holding SysRq (Alt+PrintScreen). It also works on a serial console (on PC hardware at least), if you send a BREAK and then within 5 seconds a command keypress. The keys are documented in Documentation/sysrq.txt. Don't say Y unless you really know what this hack does.
arch/h8300/Kconfig
The configuration item CONFIG_MAGIC_SYSRQ:
(none)
Enables console device to interprent special characters as commands to dump state information.
arch/arm26/Kconfig
The configuration item CONFIG_MAGIC_SYSRQ:
CONFIG_DEBUG_KERNEL
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). This is accomplished by pressing various keys while holding SysRq (Alt+PrintScreen). It also works on a serial console (on PC hardware at least), if you send a BREAK and then within 5 seconds a command keypress. The keys are documented in Documentation/sysrq.txt. Don't say Y unless you really know what this hack does.
arch/arm/Kconfig
The configuration item CONFIG_MAGIC_SYSRQ:
CONFIG_DEBUG_KERNEL
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). This is accomplished by pressing various keys while holding SysRq (Alt+PrintScreen). It also works on a serial console (on PC hardware at least), if you send a BREAK and then within 5 seconds a command keypress. The keys are documented in Documentation/sysrq.txt. Don't say Y unless you really know what this hack does.
arch/alpha/Kconfig
The configuration item CONFIG_MAGIC_SYSRQ:
CONFIG_DEBUG_KERNEL
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). This is accomplished by pressing various keys while holding SysRq (Alt+PrintScreen). It also works on a serial console (on PC hardware at least), if you send a BREAK and then within 5 seconds a command keypress. The keys are documented in Documentation/sysrq.txt. Don't say Y unless you really know what this hack does.
arch/mips/Kconfig-shared
The configuration item CONFIG_MAGIC_SYSRQ:
CONFIG_DEBUG_KERNEL
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). This is accomplished by pressing various keys while holding SysRq (Alt+PrintScreen). It also works on a serial console (on PC hardware at least), if you send a BREAK and then within 5 seconds a command keypress. The keys are documented in Documentation/sysrq.txt. Don't say Y unless you really know what this hack does.
arch/mips64/Kconfig
The configuration item CONFIG_MAGIC_SYSRQ:
(none)
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). This is accomplished by pressing various keys while holding SysRq (Alt+PrintScreen). It also works on a serial console (on PC hardware at least), if you send a BREAK and then within 5 seconds a command keypress. The keys are documented in Documentation/sysrq.txt. Don't say Y unless you really know what this hack does.
arch/s390x/Kconfig
The configuration item CONFIG_MAGIC_SYSRQ:
CONFIG_DEBUG_KERNEL
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). This is accomplished by pressing various keys while holding SysRq (Alt+PrintScreen). It also works on a serial console (on PC hardware at least), if you send a BREAK and then within 5 seconds a command keypress. The keys are documented in Documentation/sysrq.txt. Don't say Y unless you really know what this hack does.
Raw data from LKDDb:
lkddb input .... .... .... .... 00000002 01000000 .... ................ .. .... .. ................ .... : CONFIG_MAGIC_SYSRQ : drivers/char/sysrq.c # in 2.6.35–2.6.36
lkddb input .... .... .... .... 00000002 01000000 .... ................ .. .... .. ................ .... : CONFIG_MAGIC_SYSRQ : drivers/tty/sysrq.c # in 2.6.37–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.12
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