linux-kernel - Re: [PATCH] x86/process: Silence KASAN warnings in get

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Message-ID: <20151005185810.GF26924@tassilo.jf.intel.com>
Date:	Mon, 5 Oct 2015 11:58:10 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc:	Dmitry Vyukov <dvyukov@...gle.com>, Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"x86@...nel.org" <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>,
	Andrey Konovalov <andreyknvl@...gle.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	kasan-dev <kasan-dev@...glegroups.com>,
	Borislav Petkov <bp@...en8.de>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Wolfram Gloger <wmglo@...t.med.uni-muenchen.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] x86/process: Silence KASAN warnings in get_wchan()

> Yes, it might be better. Although, because of broken -fconserve-stack, this may
> not work in some cases - https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63533
> Function splitter may split original function into two parts and it always puts one split
> part in default .text section.

Interesting.

I guess could just add noinline too. It only happens with inlining, right?

Probably that needs to be added to all the existing section users too,
like __kprobes.

-Andi
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