linux-kernel - Re: [PATCH 1/7] mm: allocate mm_cpumask dynamically based on nr_cpu

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Date:   Thu, 21 Jun 2018 16:18:17 -0400
From:   Rik van Riel <riel@...riel.com>
To:     kbuild test robot <lkp@...el.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org, luto@...nel.org,
        mingo@...nel.org, tglx@...utronix.de, dave.hansen@...ux.intel.com,
        efault@....de, songliubraving@...com, kernel-team@...com
Subject: Re: [PATCH 1/7] mm: allocate mm_cpumask dynamically based on
 nr_cpu_ids

On Thu, 2018-06-21 at 05:32 +0800, kbuild test robot wrote:
> Hi Rik,
> 
> Thank you for the patch! Yet something to improve:
> 
> [auto build test ERROR on v4.17]
> [also build test ERROR on next-20180620]
> [cannot apply to tip/x86/core linus/master mmotm/master v4.18-rc1]
> [if your patch is applied to the wrong git tree, please drop us a
> note to help improve the system]
> 
> url:    https://github.com/0day-ci/linux/commits/Rik-van-Riel/x86-tlb
> -mm-make-lazy-TLB-mode-even-lazier/20180621-045620
> config: x86_64-randconfig-x016-201824 (attached as .config)
> compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
> reproduce:
>         # save the attached .config to linux build tree
>         make ARCH=x86_64 
> 
> Note: the linux-review/Rik-van-Riel/x86-tlb-mm-make-lazy-TLB-mode-
> even-lazier/20180621-045620 HEAD
> 7f2e7d915758c367dd0515efc17af977592fa141 builds fine.
>       It only hurts bisectibility.
> 
> All errors (new ones prefixed by >>):
> 
> > > mm/init-mm.c:38:1: error: Only string constants are supported as
> > > initializers for randomized structures with flexible arrays
> 
>     };

Fixed in my tree for v2, by moving all of the randomizable
bits of mm_struct into an anonymous sub-structure, and
making sure the bitmap is always at the end.

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