linux-kernel - Re: [PATCH] prctl: Don't compile some of prctl functions when CRUI

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Message-Id: <20180420140044.478b4c88d3cf238bd440f2a7@linux-foundation.org>
Date:   Fri, 20 Apr 2018 14:00:44 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     kbuild test robot <lkp@...el.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        kbuild-all@...org, Cyrill Gorcunov <gorcunov@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...nel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Andrey Vagin <avagin@...nvz.org>,
        Andrew Morton <akpm@...uxfoundation.org>,
        Pavel Emelyanov <xemul@...tuozzo.com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Yang Shi <yang.shi@...ux.alibaba.com>
Subject: Re: [PATCH] prctl: Don't compile some of prctl functions when CRUI

On Sat, 21 Apr 2018 04:37:41 +0800 kbuild test robot <lkp@...el.com> wrote:

> I love your patch! Yet something to improve:
> 
> [auto build test ERROR on linus/master]
> [also build test ERROR on v4.17-rc1 next-20180420]
> [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/Sergey-Senozhatsky/prctl-Don-t-compile-some-of-prctl-functions-when-CRUI/20180421-040826
> config: i386-tinyconfig (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=i386 
> 
> All errors (new ones prefixed by >>):
> 
>    kernel/sys.c: In function 'prctl_set_mm':
> >> kernel/sys.c:2108:10: error: implicit declaration of function 'prctl_set_mm_exe_file'; did you mean 'set_mm_exe_file'? [-Werror=implicit-function-declaration]
>       return prctl_set_mm_exe_file(mm, (unsigned int)addr);
>              ^~~~~~~~~~~~~~~~~~~~~

"prctl: don't compile some of prctl functions when CRUI disabled" was a
fix against "prctl: remove non PR_SET_MM_MAP operations", and it
appears that the base patch wasn't applied when this test was
performed.