linux-kernel - Re: [RFC 1/4] PM: hibernate: export hibernation_in

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Message-ID: <CAJZ5v0hCxpWXdnoQeW79kaDFmHcfE0A4k7JuA9T+RR1OyCw29w@mail.gmail.com>
Date: Wed, 22 Oct 2025 11:53:20 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: "Mario Limonciello (AMD) (kernel.org)" <superm1@...nel.org>
Cc: Muhammad Usama Anjum <usama.anjum@...labora.com>, "Rafael J. Wysocki" <rafael@...nel.org>, 
	Len Brown <lenb@...nel.org>, Pavel Machek <pavel@...nel.org>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Danilo Krummrich <dakr@...nel.org>, 
	Dmitry Torokhov <dmitry.torokhov@...il.com>, Thomas Gleixner <tglx@...utronix.de>, 
	Peter Zijlstra <peterz@...radead.org>, linux-acpi@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org, 
	linux-input@...r.kernel.org, kernel@...labora.com
Subject: Re: [RFC 1/4] PM: hibernate: export hibernation_in_progress()

On Tue, Oct 21, 2025 at 11:07 PM Mario Limonciello (AMD) (kernel.org)
<superm1@...nel.org> wrote:
>
>
>
> On 10/18/2025 9:21 AM, Muhammad Usama Anjum wrote:
> > Export hibernation_in_progress() to be used by other modules. Add its
> > signature when hibernation config isn't enabled as well.
>
> I wonder if you actually want to have pm_sleep_transition_in_progress()
> exported instead.  "Logically" I would expect cancelling a hibernate and
> cancelling a suspend should work similarly.

Well, it does AFAICS, except that only the "freeze" and "poweroff"
transitions can be aborted during hibernation.  This is analogous to
aborting a suspend transition.

The missing part is a mechanism to cancel hibernation between image
creation and the "poweroff" transition.