On Monday, 5 of November 2007, Alan Stern wrote:
> This patch (as1008) converts the PM notifier routines from inline
> calls to out-of-line code. It also prevents pm_chain_head from
> being created when CONFIG_PM_SLEEP isn't enabled, and EXPORTs the
> notifier registration and unregistration routines.
>
> Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
I'd prefer to define the routines in main.c, because I really don't consider
them as being strictly related to the freezing of processes.
Greetings,
Rafael
> ---
>
> Index: usb-2.6/include/linux/suspend.h
> ===================================================================
> --- usb-2.6.orig/include/linux/suspend.h
> +++ usb-2.6/include/linux/suspend.h
> @@ -216,17 +216,8 @@ void __save_processor_state(struct saved
> void __restore_processor_state(struct saved_context *ctxt);
>
> /* kernel/power/main.c */
> -extern struct blocking_notifier_head pm_chain_head;
> -
> -static inline int register_pm_notifier(struct notifier_block *nb)
> -{
> - return blocking_notifier_chain_register(&pm_chain_head, nb);
> -}
> -
> -static inline int unregister_pm_notifier(struct notifier_block *nb)
> -{
> - return blocking_notifier_chain_unregister(&pm_chain_head, nb);
> -}
> +extern int register_pm_notifier(struct notifier_block *nb);
> +extern int unregister_pm_notifier(struct notifier_block *nb);
>
> #define pm_notifier(fn, pri) { \
> static struct notifier_block fn##_nb = \
> Index: usb-2.6/kernel/power/main.c
> ===================================================================
> --- usb-2.6.orig/kernel/power/main.c
> +++ usb-2.6/kernel/power/main.c
> @@ -24,8 +24,6 @@
>
> #include "power.h"
>
> -BLOCKING_NOTIFIER_HEAD(pm_chain_head);
> -
> DEFINE_MUTEX(pm_mutex);
>
> #ifdef CONFIG_SUSPEND
> Index: usb-2.6/kernel/power/power.h
> ===================================================================
> --- usb-2.6.orig/kernel/power/power.h
> +++ usb-2.6/kernel/power/power.h
> @@ -203,11 +203,5 @@ static inline int suspend_devices_and_en
> }
> #endif /* !CONFIG_SUSPEND */
>
> -/* kernel/power/common.c */
> -extern struct blocking_notifier_head pm_chain_head;
> -
> -static inline int pm_notifier_call_chain(unsigned long val)
> -{
> - return (blocking_notifier_call_chain(&pm_chain_head, val, NULL)
> - == NOTIFY_BAD) ? -EINVAL : 0;
> -}
> +/* kernel/power/process.c */
> +extern int pm_notifier_call_chain(unsigned long val);
> Index: usb-2.6/kernel/power/process.c
> ===================================================================
> --- usb-2.6.orig/kernel/power/process.c
> +++ usb-2.6/kernel/power/process.c
> @@ -283,3 +283,25 @@ void thaw_processes(void)
> }
>
> EXPORT_SYMBOL(refrigerator);
> +
> +/* Routines for PM-transition notifications */
> +
> +static BLOCKING_NOTIFIER_HEAD(pm_chain_head);
> +
> +int register_pm_notifier(struct notifier_block *nb)
> +{
> + return blocking_notifier_chain_register(&pm_chain_head, nb);
> +}
> +EXPORT_SYMBOL_GPL(register_pm_notifier);
> +
> +int unregister_pm_notifier(struct notifier_block *nb)
> +{
> + return blocking_notifier_chain_unregister(&pm_chain_head, nb);
> +}
> +EXPORT_SYMBOL_GPL(unregister_pm_notifier);
> +
> +int pm_notifier_call_chain(unsigned long val)
> +{
> + return (blocking_notifier_call_chain(&pm_chain_head, val, NULL)
> + == NOTIFY_BAD) ? -EINVAL : 0;
> +}
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