linux-kernel - [RFC] Fix restore from hibernate with different kernel versions.

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Date:	Wed,  1 May 2013 21:53:29 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	rjw@...k.pl, pavel@....cz, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, x86@...nel.org
Subject: [RFC] Fix restore from hibernate with different kernel versions.

This patch is intended for v3.10 and it should be considered RFC as I had
only tested it under QEMU and not real hardware (that to be done on Friday).

The patch addresses a shortcomming of the git commite
7a5cd063c7b4c58417f674821d63f5eb6747e37 ("x86-64, gdt: Store/load GDT for
ACPI S3 or hibernate/resume path is not needed.") where its assumption
about restoring a kernel was incorrect. Specifically it assumed that a resumed
kernel MUST be the same as the one booted. That is only true for 32-bit
kernels but not for 64-bit.

And as such it introduces a regression which the attached patch is
fixing.

The patch goes further and also lays the groundwork to make this work under
a 32-bit kernel - even though it is not neccessary. This is done to unify
the 32 and 64-bit code and make it easier in the future to unify the
respective code closer.

 arch/x86/include/asm/suspend_32.h |  1 +
 arch/x86/include/asm/suspend_64.h |  2 ++
 arch/x86/kernel/asm-offsets_32.c  |  3 +++
 arch/x86/kernel/asm-offsets_64.c  |  1 +
 arch/x86/power/cpu.c              | 15 ++++++++++-----
 arch/x86/power/hibernate_asm_32.S |  4 ++++
 arch/x86/power/hibernate_asm_64.S |  3 +++
 7 files changed, 24 insertions(+), 5 deletions(-)

Konrad Rzeszutek Wilk (1):
      x86, x86-64, gdt, hibernate: Store/load GDT for hibernate path.

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