linux-kernel - Re: [PATCH v15 13/25] x86/reboot: Add ljmp instructions to stacktool whitelist

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Message-ID: <20160120104437.GE23186@pd.tnic>
Date:	Wed, 20 Jan 2016 11:44:37 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Josh Poimboeuf <jpoimboe@...hat.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	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>,
	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>
Subject: Re: [PATCH v15 13/25] x86/reboot: Add ljmp instructions to stacktool
 whitelist

On Tue, Jan 19, 2016 at 11:42:56PM -0600, Josh Poimboeuf wrote:
> I've now gotten the number of warnings down to 0 (except for a few
> staging drivers), even with allyesconfig (with !CONFIG_GCOV).
> 
> I've also managed to make stacktool a little smarter such that the
> in-code STACKTOOL_IGNORE_INSN markers are no longer needed, woot!

Oh wow! :-)

> There's still a need for 4 STACKTOOL_IGNORE_FUNC(name) markers in the
> entire tree, due to the weird cases I mentioned.  But they're placed
> after the functions, so they're much less disruptive.

Sounds nice.

Thanks!

-- 
Regards/Gruss,
    Boris.

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