linux-kernel - [PATCH] x86: v3.4-rc1 s2ram regression

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Date:	Sun, 01 Apr 2012 17:26:43 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	x86@...nel.org, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org
Cc:	Marcelo Tosatti <mtosatti@...hat.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Ingo Molnar <mingo@...hat.com>,
	Avi Kivity <avi@...hat.com>, Pavel Machek <pavel@....cz>,
	"H. Peter Anvin" <hpa@...or.com>,
	Igor Mammedov <imammedo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH] x86: v3.4-rc1 s2ram regression

commit b74f05d61b73af584d0c39121980171389ecfaaa
("x86: kvmclock: abstract save/restore sched_clock_state")
breaks s2ram for my notebook. It hangs (maybe panic) somewhere on resume stage
and blinks with all possible leds =) Screen is black, so I don't know what happened.

reverting or following patch helps

Bisected-by: Konstantin Khlebnikov <khlebnikov@...nvz.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Marcelo Tosatti <mtosatti@...hat.com>
Cc: Avi Kivity <avi@...hat.com>
Cc: Igor Mammedov <imammedo@...hat.com>
---
 arch/x86/power/cpu.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/power/cpu.c b/arch/x86/power/cpu.c
index 4793683..2bc5a82 100644
--- a/arch/x86/power/cpu.c
+++ b/arch/x86/power/cpu.c
@@ -231,8 +231,8 @@ static void __restore_processor_state(struct saved_context *ctxt)
 /* Needed by apm.c */
 void restore_processor_state(void)
 {
-	x86_platform.restore_sched_clock_state();
 	__restore_processor_state(&saved_context);
+	x86_platform.restore_sched_clock_state();
 }
 #ifdef CONFIG_X86_32
 EXPORT_SYMBOL(restore_processor_state);

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