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Message-ID: <5614DDD2.3080408@virtuozzo.com> Date: Wed, 7 Oct 2015 11:54:42 +0300 From: Andrey Ryabinin <aryabinin@...tuozzo.com> To: Andy Lutomirski <luto@...capital.net>, Ingo Molnar <mingo@...nel.org> CC: Andi Kleen <ak@...ux.intel.com>, Dmitry Vyukov <dvyukov@...gle.com>, 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>, 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() On 10/06/2015 09:11 PM, Andy Lutomirski wrote: > > But what's wrong with the GCC attribute mechanism? Surely GCC ought > to be able to generate the code, at least in the simple cases, and the > attribute already exists. The attribute and READ_ONCE_NOCHECK seem > like the least messy in the C code. The problem with 'no_sanitize_address' attribute is incompatibility with inlining. GCC can't inline function with that attribute into function without it. And the contrary is also true - GCC can't inline function without attribute into function with such attribute. Failure to inline always_inline function leads to build failure. And under CONFIG_OPTIMIZE=n 'inline' means 'always_inline'. include/linux/compiler-gcc.h: #if !defined(CONFIG_ARCH_SUPPORTS_OPTIMIZED_INLINING) || \ !defined(CONFIG_OPTIMIZE_INLINING) || (__GNUC__ < 4) #define inline inline __attribute__((always_inline)) notrace -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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