linux-kernel - Re: [PATCH] PM: hibernate: add sanity check on power

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Date:   Tue, 2 Feb 2021 10:04:52 +0100
From:   Pavel Machek <pavel@....cz>
To:     Abel Wu <abel.w@...oud.com>
Cc:     rjw@...ysocki.net, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, hewenliang4@...wei.com,
        wuyun.wu@...wei.com
Subject: Re: [PATCH] PM: hibernate: add sanity check on power_kobj

On Tue 2021-02-02 09:59:11, Abel Wu wrote:
> 
> 
> > On Feb 1, 2021, at 6:52 PM, Pavel Machek <pavel@....cz> wrote:
> > 
> > On Mon 2021-02-01 02:50:41, Abel Wu wrote:
> >> The @power_kobj is initialized in pm_init() which is the same
> >> initcall level as pm_disk_init(). Although this dependency is
> >> guaranteed based on the current initcall serial execution model,
> >> it would still be better do a cost-less sanity check to avoid
> >> oops once the dependency is broken.
> > 
> > I don't believe this is good idea. If the dependency is ever broken,
> > this will make failure more subtle and harder to debug.
> 
> Thanks for reviewing. I think the cmdline parameter initcall_debug will
> help in this case.
> Actually we are trying to make initcalls being called asynchronously to
> reduce boot time which is crucial to our cloud-native business. And we
> resolve this kind of dependencies by retrying failed initcalls.

And this patch is okay if that gets mainlined, but not before.

Best regards,
							Pavel
							
-- 
http://www.livejournal.com/~pavelmachek

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