Message-id: <53BE4412.6030707@samsung.com>
Date: Thu, 10 Jul 2014 11:43:14 +0400
From: Andrey Ryabinin <a.ryabinin@samsung.com>
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To: Christoph Lameter <cl@gentwo.org>
Cc: linux-kernel@vger.kernel.org, Dmitry Vyukov <dvyukov@google.com>,
        Konstantin Serebryany <kcc@google.com>,
        Alexey Preobrazhensky <preobr@google.com>,
        Andrey Konovalov <adech.fo@gmail.com>,
        Yuri Gribov <tetra2005@gmail.com>,
        Konstantin Khlebnikov <koct9i@gmail.com>,
        Sasha Levin <sasha.levin@oracle.com>, Michal Marek <mmarek@suse.cz>,
        Russell King <linux@arm.linux.org.uk>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
        Pekka Enberg <penberg@kernel.org>,
        David Rientjes <rientjes@google.com>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        linux-kbuild@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        x86@kernel.org, linux-mm@kvack.org
Subject: Re: [RFC/PATCH RESEND -next 12/21] mm: util: move krealloc/kzfree to
 slab_common.c
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 <alpine.DEB.2.11.1407090931350.1384@gentwo.org>
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On 07/09/14 18:32, Christoph Lameter wrote:
> On Wed, 9 Jul 2014, Andrey Ryabinin wrote:
> 
>> To avoid false positive reports in kernel address sanitizer krealloc/kzfree
>> functions shouldn't be instrumented. Since we want to instrument other
>> functions in mm/util.c, krealloc/kzfree moved to slab_common.c which is not
>> instrumented.
>>
>> Unfortunately we can't completely disable instrumentation for one function.
>> We could disable compiler's instrumentation for one function by using
>> __atribute__((no_sanitize_address)).
>> But the problem here is that memset call will be replaced by instumented
>> version kasan_memset since currently it's implemented as define:
> 
> Looks good to me and useful regardless of the sanitizer going in.
> 
> Acked-by: Christoph Lameter <cl@linux.com>
> 

I also noticed in mm/util.c:

	/* Tracepoints definitions. */
	EXPORT_TRACEPOINT_SYMBOL(kmalloc);
	EXPORT_TRACEPOINT_SYMBOL(kmem_cache_alloc);
	EXPORT_TRACEPOINT_SYMBOL(kmalloc_node);
	EXPORT_TRACEPOINT_SYMBOL(kmem_cache_alloc_node);
	EXPORT_TRACEPOINT_SYMBOL(kfree);
	EXPORT_TRACEPOINT_SYMBOL(kmem_cache_free);

Should I send another patch to move this to slab_common.c?


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