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We have Beaglebone Black based custom board, with Linux 4.4. I wanted to track down the low level function corresponding to the reboot() system call.

I am able to see sys_reboot() in include/uapi/asm-generic/unistd.h however I am not able to get to definition of the sys_reboot function.

Where can I find the definition of sys_reboot in the kernel source?

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Reset to default
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The reboot system call is defined in kernel/reboot.c — look for SYSCALL_DEFINE4(reboot.

For ARM systems you’ll probably be interested in the ARM-specific support in arch/arm/kernel/reboot.c, and perhaps in machine-specific support in one of the arch/arm/mach-… directories.

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