linux-kernel - Re: [PATCH v5 07/10] x86/asm/acpi: Fix asmvalidate warnings for wakeup

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Message-ID: <20150610141354.GB25848@treble.redhat.com>
Date:	Wed, 10 Jun 2015 09:13:54 -0500
From:	Josh Poimboeuf <jpoimboe@...hat.com>
To:	Pavel Machek <pavel@....cz>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, 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>, x86@...nel.org,
	live-patching@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>, linux-pm@...r.kernel.org
Subject: Re: [PATCH v5 07/10] x86/asm/acpi: Fix asmvalidate warnings for
 wakeup_64.S

On Wed, Jun 10, 2015 at 03:21:35PM +0200, Pavel Machek wrote:
> On Wed 2015-06-10 07:06:15, Josh Poimboeuf wrote:
> > Fix the following asmvalidate warnings:
> > 
> >    asmvalidate: arch/x86/kernel/acpi/wakeup_64.o: wakeup_long64()+0x15: unsupported jump to outside of function
> >    asmvalidate: arch/x86/kernel/acpi/wakeup_64.o: wakeup_long64()+0x55: unsupported jump to outside of function
> >    asmvalidate: arch/x86/kernel/acpi/wakeup_64.o: wakeup_long64(): unsupported fallthrough at end of function
> >    asmvalidate: arch/x86/kernel/acpi/wakeup_64.o: do_suspend_lowlevel()+0x9a: unsupported jump to outside of function
> >    asmvalidate: arch/x86/kernel/acpi/wakeup_64.o: do_suspend_lowlevel()+0x116: unsupported jump to outside of function
> >    asmvalidate: arch/x86/kernel/acpi/wakeup_64.o: do_suspend_lowlevel(): unsupported fallthrough at end of function
> >    asmvalidate: arch/x86/kernel/acpi/wakeup_64.o: do_suspend_lowlevel(): missing FP_SAVE/RESTORE macros
> >
> 
> Actually first things first. Purpose of warnings is to pinpoint
> errors. Do you believe there are some errors in wakeup_64.S?

The "errors" are that it doesn't conform with the guidelines outlined in
the cover letter.  Specifically, wakeup_long64() is improperly
annotated, and do_suspend_lowlevel() doesn't honor CONFIG_FRAME_POINTER.

-- 
Josh
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