linux-kernel - Re: [PATCH 5/7] PM: PM notifier error injection

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Date:	Fri, 8 Jul 2011 19:43:20 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Akinobu Mita <akinobu.mita@...il.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	Pavel Machek <pavel@....cz>,
	linux-pm@...ts.linux-foundation.org
Subject: Re: [PATCH 5/7] PM: PM notifier error injection

On Friday, July 08, 2011, Akinobu Mita wrote:
> >> --- a/kernel/power/main.c
> >> +++ b/kernel/power/main.c
> >> @@ -42,6 +42,36 @@ int pm_notifier_call_chain(unsigned long val)
> >>       return notifier_to_errno(ret);
> >>  }
> >>
> >> +#ifdef CONFIG_PM_NOTIFIER_ERROR_INJECTION
> >> +
> >> +static struct err_inject_notifier_block err_inject_pm_notifier = {
> >> +     .actions = {
> >> +             { ERR_INJECT_NOTIFIER_ACTION(PM_HIBERNATION_PREPARE) },
> >> +             { ERR_INJECT_NOTIFIER_ACTION(PM_SUSPEND_PREPARE) },
> >> +             { ERR_INJECT_NOTIFIER_ACTION(PM_RESTORE_PREPARE) },
> >> +             {}
> >
> > Why have you omitted the PM_POST_* actions?
> 
> Because the callbacks of PM_POST_* are not supposed to fail (i.e.
> the return value of pm_notifier_call() is ignored).

OK, fair enough.

> >> --- a/lib/Kconfig.debug
> >> +++ b/lib/Kconfig.debug
> >> @@ -1043,6 +1043,14 @@ config CPU_NOTIFIER_ERROR_INJECTION
> >>         # echo 0 > /sys/devices/system/cpu/cpu1/online
> >>         bash: echo: write error: Operation not permitted
> >>
> >> +config PM_NOTIFIER_ERROR_INJECTION
> >> +     bool "PM notifier error injection"
> >> +     depends on PM_DEBUG && NOTIFIER_ERROR_INJECTION
> >> +     help
> >> +       This option provides the ability to inject artifical errors to
> >> +       PM notifier chain callbacks.  It is controlled through debugfs
> >> +       interface under /sys/kernel/debug/pm-notifier-error-inject/
> >
> > I'm not sure the help is necessary.  I think it should be selected
> > automatically if both PM_DEBUG and NOTIFIER_ERROR_INJECTION are set.
> 
> OK, I'll try to tweak the option to be better.

Thanks!

Rafael
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