linux-kernel - Re: ftraced and suspend to ram

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <alpine.DEB.1.10.0808221651350.15941@gandalf.stny.rr.com>
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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/