linux-kernel - Re: [PATCH v15 20/25] x86/asm/acpi: Create a stack frame in do_suspend

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Message-ID: <2897805.ggaLPyNUGa@vostro.rjw.lan>
Date:	Sun, 20 Dec 2015 17:13:48 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Josh Poimboeuf <jpoimboe@...hat.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, live-patching@...r.kernel.org,
	Michal Marek <mmarek@...e.cz>,
	Peter Zijlstra <peterz@...radead.org>,
	Andy Lutomirski <luto@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Pedro Alves <palves@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	Bernd Petrovitsch <bernd@...rovitsch.priv.at>,
	Chris J Arges <chris.j.arges@...onical.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>
Subject: Re: [PATCH v15 20/25] x86/asm/acpi: Create a stack frame in do_suspend_lowlevel()

On Friday, December 18, 2015 06:39:34 AM Josh Poimboeuf wrote:
> do_suspend_lowlevel() is a callable non-leaf function which doesn't
> honor CONFIG_FRAME_POINTER, which can result in bad stack traces.
> 
> Create a stack frame for it when CONFIG_FRAME_POINTER is enabled.
> 
> Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
> Acked-by: Pavel Machek <pavel@....cz>
> Cc: Rafael J. Wysocki <rjw@...ysocki.net>
> Cc: Len Brown <len.brown@...el.com>

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

> ---
>  arch/x86/kernel/acpi/wakeup_64.S | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/arch/x86/kernel/acpi/wakeup_64.S b/arch/x86/kernel/acpi/wakeup_64.S
> index 8c35df4..169963f 100644
> --- a/arch/x86/kernel/acpi/wakeup_64.S
> +++ b/arch/x86/kernel/acpi/wakeup_64.S
> @@ -5,6 +5,7 @@
>  #include <asm/page_types.h>
>  #include <asm/msr.h>
>  #include <asm/asm-offsets.h>
> +#include <asm/frame.h>
>  
>  # Copyright 2003 Pavel Machek <pavel@...e.cz>, distribute under GPLv2
>  
> @@ -39,6 +40,7 @@ bogus_64_magic:
>  	jmp	bogus_64_magic
>  
>  ENTRY(do_suspend_lowlevel)
> +	FRAME_BEGIN
>  	subq	$8, %rsp
>  	xorl	%eax, %eax
>  	call	save_processor_state
> @@ -109,6 +111,7 @@ ENTRY(do_suspend_lowlevel)
>  
>  	xorl	%eax, %eax
>  	addq	$8, %rsp
> +	FRAME_END
>  	jmp	restore_processor_state
>  ENDPROC(do_suspend_lowlevel)
>  
> 

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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