linux-kernel - Re: ftraced and suspend to ram

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Date:	Fri, 22 Aug 2008 16:55:05 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Pavel Machek <pavel@...e.cz>,
	Marcin Slusarz <marcin.slusarz@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: ftraced and suspend to ram


On Fri, 22 Aug 2008, Rafael J. Wysocki wrote:
> > > tracing. Certainly all the assembly functions.
> > 
> > I'm looking into that now too. Are the functions in arch/x86/power/cpu*.c 
> > the suspend to ram code?
> 
> They contain code executed during suspend to RAM, but such code is also:
> - in all files under arch/x86/kernel/acpi/
> - in main.c, console.c under kernel/power
> - in all files under drivers/acpi/sleep
> - in drivers/acpi/hardware/hwsleep.c
> 
> Generally, ACPI is heavily involved and I'm not the right person to ask which
> of the ACPI functions should get the 'notrace' thing.  Also, I'm not sure about
> the device drivers' ->suspend() and ->resume() callbacks, especially for
> sysdevs and ->suspend_late(), ->resume_early() for platform devices and PCI.
> 
> Well, how exactly suspend to RAM is broken by ftrace?
> 

I know that the smp_processor_id may be defined in the %fs register, but 
if ftrace is called before the %fs is set up, it may crash because it 
uses smp_processor_id.

-- Steve

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