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Date: Sun, 16 Nov 2014 19:26:25 -0800
Message-ID: <CAE9FiQUQEnXA-vX2L3VhSucNbRf3u8Afmn=M0CoXHeUyPhuAOA@mail.gmail.com>
Subject: Re: [PATCH v2] x86, mm: set NX across entire PMD at boot
From: Yinghai Lu <yinghai@kernel.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Kees Cook <keescook@chromium.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
        "the arch/x86 maintainers" <x86@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Andy Lutomirski <luto@amacapital.net>,
        Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>,
        Wang Nan <wangnan0@huawei.com>, David Vrabel <david.vrabel@citrix.com>
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Sender: linux-kernel-owner@vger.kernel.org

On Sun, Nov 16, 2014 at 10:52 AM, Thomas Gleixner <tglx@linutronix.de> wrote:
>> >
>> > Are you sure? For me, _brk_end isn't far enough:
>> >
>> > [    1.475572] all_end: 0xffffffff82df5000
>> > [    1.476736] _brk_end: 0xffffffff82dd6000
>>
>> Yes. _brk_end should be small then &_end.
>
> Wrong. _brk_end can move up to _end, i.e. to __brk_limit.

Confused. What is wrong? _brk_end is not smaller than &_end?

Yinghai
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