From mboxrd@z Thu Jan  1 00:00:00 1970
From: rjw@rjwysocki.net (Rafael J. Wysocki)
Date: Tue, 14 Jun 2016 00:05:28 +0200
Subject: [PATCH 3/5] PM / Hibernate: Allow architectures to specify the
 hibernate/resume CPU
In-Reply-To: <1464876657-6692-4-git-send-email-james.morse@arm.com>
References: <1464876657-6692-1-git-send-email-james.morse@arm.com>
 <1464876657-6692-4-git-send-email-james.morse@arm.com>
Message-ID: <1982845.x73eTHIS7X@vostro.rjw.lan>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Thursday, June 02, 2016 03:10:55 PM James Morse wrote:
> On arm64 the cpu with logical id 0 is assumed to be the boot CPU. If a
> user hotplugs this CPU out, then uses kexec to boot a new kernel, the new
> kernel will assign logical id 0 to a different physical CPU.
> This breaks hibernate as hibernate and resume will be attempted on different
> CPUs.
> 
> Define a weak symbol arch_hibernation_disable_cpus(), which defaults to
> calling disable_nonboot_cpus). Architectures that allow CPU 0 to be
> hotplugged can use this to control which CPU is used for hibernate/resume.
> 
> Signed-off-by: James Morse <james.morse@arm.com>
> Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
> Cc: Pavel Machek <pavel@ucw.cz>
> ---
> I would have preferred a macro, but there is no hibernate-relevant header
> file that all arch's have. arm, arm64 and x86 have a suspend.h, but powerpc
> doesn't.

What about include/linux/suspend.h?

There are arch_ things declared in there.

Thanks,
Rafael