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CONFIG_MAGIC_SYSRQ: Magic SysRq key

General informations

The Linux kernel configuration item CONFIG_MAGIC_SYSRQ has multiple definitions:

Magic SysRq key found in lib/Kconfig.debug

The configuration item CONFIG_MAGIC_SYSRQ:

Help text

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.

Magic SysRq key found in arch/um/Kconfig

The configuration item CONFIG_MAGIC_SYSRQ:

Help text

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.

Magic SysRq key found in arch/um/Kconfig.um

The configuration item CONFIG_MAGIC_SYSRQ:

Help text

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.

Magic SysRq key found in arch/frv/Kconfig

The configuration item CONFIG_MAGIC_SYSRQ:

Help text

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.

Magic SysRq key found in arch/m32r/Kconfig

The configuration item CONFIG_MAGIC_SYSRQ:

Help text

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.

Magic SysRq key found in arch/x86_64/Kconfig

The configuration item CONFIG_MAGIC_SYSRQ:

Help text

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.

Magic SysRq key found in arch/v850/Kconfig

The configuration item CONFIG_MAGIC_SYSRQ:

Help text

Enables console device to interprent special characters as commands to dump state information.

Magic SysRq key found in arch/sparc64/Kconfig

The configuration item CONFIG_MAGIC_SYSRQ:

Help text

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.

Magic SysRq key found in arch/sparc/Kconfig

The configuration item CONFIG_MAGIC_SYSRQ:

Help text

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.

Magic SysRq key found in arch/sh64/Kconfig

The configuration item CONFIG_MAGIC_SYSRQ:

Help text

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.

Magic SysRq key found in arch/sh/Kconfig

The configuration item CONFIG_MAGIC_SYSRQ:

Help text

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.

Magic SysRq key found in arch/s390/Kconfig

The configuration item CONFIG_MAGIC_SYSRQ:

Help text

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.

Magic SysRq key found in arch/ppc64/Kconfig

The configuration item CONFIG_MAGIC_SYSRQ:

Help text

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.

Magic SysRq key found in arch/ppc/Kconfig

The configuration item CONFIG_MAGIC_SYSRQ:

Help text

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.

Magic SysRq key found in arch/parisc/Kconfig

The configuration item CONFIG_MAGIC_SYSRQ:

Help text

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.

Magic SysRq key found in arch/mips/Kconfig

The configuration item CONFIG_MAGIC_SYSRQ:

Help text

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.

Magic SysRq key found in arch/m68knommu/Kconfig

The configuration item CONFIG_MAGIC_SYSRQ:

Help text

Enables console device to interpret special characters as commands to dump state information.

Magic SysRq key found in arch/m68k/Kconfig

The configuration item CONFIG_MAGIC_SYSRQ:

Help text

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.

Magic SysRq key found in arch/ia64/Kconfig

The configuration item CONFIG_MAGIC_SYSRQ:

Help text

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.

Magic SysRq key found in arch/i386/Kconfig

The configuration item CONFIG_MAGIC_SYSRQ:

Help text

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.

Magic SysRq key found in arch/h8300/Kconfig

The configuration item CONFIG_MAGIC_SYSRQ:

Help text

Enables console device to interprent special characters as commands to dump state information.

Magic SysRq key found in arch/arm26/Kconfig

The configuration item CONFIG_MAGIC_SYSRQ:

Help text

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.

Magic SysRq key found in arch/arm/Kconfig

The configuration item CONFIG_MAGIC_SYSRQ:

Help text

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.

Magic SysRq key found in arch/alpha/Kconfig

The configuration item CONFIG_MAGIC_SYSRQ:

Help text

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.

Magic SysRq key found in arch/mips/Kconfig-shared

The configuration item CONFIG_MAGIC_SYSRQ:

Help text

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.

Magic SysRq key found in arch/mips64/Kconfig

The configuration item CONFIG_MAGIC_SYSRQ:

Help text

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.

Magic SysRq key found in arch/s390x/Kconfig

The configuration item CONFIG_MAGIC_SYSRQ:

Help text

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.

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