Re: [PATCH v5 1/7] kernel: Add support for kernel restart handler call chain

[Stephen Boyd]

On 07/18/14 00:34, Guenter Roeck wrote:
> +/**
> + *	do_kernel_restart - Execute kernel restart handler call chain
> + *
> + *	Calls functions registered with register_restart_handler.
> + *
> + *	Expected to be called from machine_restart as last step of the restart
> + *	sequence.
> + *
> + *	Restarts the system immediately if a restart handler function has been
> + *	registered. Otherwise does nothing.
> + */
> +void do_kernel_restart(char *cmd)
> +{
> +	blocking_notifier_call_chain(&restart_handler_list, reboot_mode, cmd);
> +}

Has this been tested with scheduling while atomic checking
(CONFIG_DEBUG_ATOMIC_SLEEP) or lockdep (CONFIG_PROVE_LOCKING)? ARM would
call this with irqs disabled and blocking_notifier_call_chain() would
spit out a warning when it tries to down_read() on it's semaphore. This
should probably be an atomic notifier chain instead.

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