linux-kernel - Re: [PATCHv5 1/5] x86/mm: introduce arch

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Date:   Wed, 15 Feb 2017 12:34:19 +0300
From:   Dmitry Safonov <dsafonov@...tuozzo.com>
To:     kbuild test robot <lkp@...el.com>
CC:     <kbuild-all@...org>, <linux-kernel@...r.kernel.org>,
        <0x7f454c46@...il.com>, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...e.de>, <x86@...nel.org>,
        <linux-mm@...ck.org>, Cyrill Gorcunov <gorcunov@...nvz.org>
Subject: Re: [PATCHv5 1/5] x86/mm: introduce arch_rnd() to compute 32/64 mmap
 rnd

On 02/15/2017 01:22 AM, kbuild test robot wrote:
> Hi Dmitry,
...
> vim +/mmap_rnd_compat_bits +58 arch/x86/mm/mmap.c
>
>     52	 * Leave an at least ~128 MB hole with possible stack randomization.
>     53	 */
>     54	#define MIN_GAP (128*1024*1024UL + stack_maxrandom_size())
>     55	#define MAX_GAP (TASK_SIZE/6*5)
>     56	
>     57	#ifdef CONFIG_64BIT
>   > 58	# define mmap32_rnd_bits  mmap_rnd_compat_bits
>     59	# define mmap64_rnd_bits  mmap_rnd_bits
>     60	#else
>     61	# define mmap32_rnd_bits  mmap_rnd_bits
>     62	# define mmap64_rnd_bits  mmap_rnd_bits
>     63	#endif

Yep, thanks - it's better be ifdef CONFIG_COMPAT.
Will resend today with this trivial fixup.

-- 
              Dmitry