linux-kernel - [PATCH v2 0/2] Silence KASAN warnings in get

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Date:	Tue, 13 Oct 2015 15:35:48 +0300
From:	Andrey Ryabinin <aryabinin@...tuozzo.com>
To:	<linux-kernel@...r.kernel.org>
CC:	Andrey Ryabinin <aryabinin@...tuozzo.com>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, <x86@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.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>,
	Andi Kleen <ak@...ux.intel.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Wolfram Gloger <wmglo@...t.med.uni-muenchen.de>
Subject: [PATCH v2 0/2] Silence KASAN warnings in get_wchan()


Originally I suggested to implement READ_ONCE_NOCHECK(), like this:
#define READ_ONCE_NOCHECK(x) \
{(	typeof(x) __val; \
	kasan_disable_local(); \
	__val = READ_ONCE(x); \
	kasan_enable_local(); \
	__val;\
)}

But then I realised that we can't put this into linux/compiler.h
since it requires to add some includes (we need linux/kasan.h which
also requires linux/sched.h). It's not even that simple to put this into kernel.h

So I've come to another approach, see the first patch for details.
Pros:
 - It generates more efficient code rather than variant above
Cons:
 - REAS_ONCE() becomes rather messy.


Andrey Ryabinin (2):
  Provide READ_ONCE_NOCHECK()
  x86/process: Silence KASAN warnings in get_wchan()

 arch/x86/kernel/process.c    |  6 +++---
 include/linux/compiler-gcc.h | 13 ++++++++++++
 include/linux/compiler.h     | 49 ++++++++++++++++++++++++++++++++------------
 3 files changed, 52 insertions(+), 16 deletions(-)

-- 
2.4.9

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