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Date: Fri, 30 Jan 2015 20:21:16 +0300
From: Andrey Ryabinin <a.ryabinin@samsung.com>
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To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org, Dmitry Vyukov <dvyukov@google.com>,
        Konstantin Serebryany <kcc@google.com>,
        Dmitry Chernenkov <dmitryc@google.com>,
        Andrey Konovalov <adech.fo@gmail.com>,
        Yuri Gribov <tetra2005@gmail.com>,
        Konstantin Khlebnikov <koct9i@gmail.com>,
        Sasha Levin <sasha.levin@oracle.com>, Christoph Lameter <cl@linux.com>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        Dave Hansen <dave.hansen@intel.com>, Andi Kleen <andi@firstfloor.org>,
        x86@kernel.org, linux-mm@kvack.org, Arnd Bergmann <arnd@arndb.de>,
        "open list:GENERIC INCLUDE/A..." <linux-arch@vger.kernel.org>
Subject: Re: [PATCH v10 15/17] kernel: add support for .init_array.*
 constructors
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On 01/30/2015 02:13 AM, Andrew Morton wrote:
> On Thu, 29 Jan 2015 18:11:59 +0300 Andrey Ryabinin <a.ryabinin@samsung.com> wrote:
> 
>> KASan uses constructors for initializing redzones for global
>> variables. Actually KASan doesn't need priorities for constructors,
>> so they were removed from GCC 5.0, but GCC 4.9.2 still generates
>> constructors with priorities.
> 
> I don't understand this changelog either.  What's wrong with priorities
> and what is the patch doing about it?  More details, please.
> 

Currently kernel ignore constructors with priorities (e.g. .init_array.00099).
Kernel understand only constructors with default priority ( .init_array ).

This patch adds support for constructors with priorities.

For kernel image we put pointers to constructors between __ctors_start/__ctors_end
and do_ctors() will call them.

For modules  - .init_array.* sections merged into .init_array section.
Module code properly handles constructors in .init_array section.