linux-kernel - Re: [PATCH v5] fork: free vmapped stacks in cache when cpus are offline

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Message-ID: <alpine.DEB.2.20.1702112118120.3734@nanos>
Date:   Sat, 11 Feb 2017 21:19:57 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     kbuild test robot <lkp@...el.com>
cc:     Hoeun Ryu <hoeun.ryu@...il.com>, kbuild-all@...org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>, Ingo Molnar <mingo@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Oleg Nesterov <oleg@...hat.com>, linux-kernel@...r.kernel.org,
        kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH v5] fork: free vmapped stacks in cache when cpus are
 offline

On Sat, 11 Feb 2017, kbuild test robot wrote:

> Hi Hoeun,
> 
> [auto build test ERROR on linus/master]
> [also build test ERROR on v4.10-rc7 next-20170210]
> [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/Hoeun-Ryu/fork-free-vmapped-stacks-in-cache-when-cpus-are-offline/20170211-183401
> config: ia64-allmodconfig (attached as .config)
> compiler: ia64-linux-gcc (GCC) 6.2.0
> reproduce:
>         wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # save the attached .config to linux build tree
>         make.cross ARCH=ia64 
> 
> All errors (new ones prefixed by >>):
> 
>    kernel/fork.c: In function 'fork_init':
> >> kernel/fork.c:483:2: error: implicit declaration of function 'vm_stack_cache_init' [-Werror=implicit-function-declaration]
>      vm_stack_cache_init();
>      ^~~~~~~~~~~~~~~~~~~

Right. This needs to move to a different place as that part is nested inside

#ifndef CONFIG_ARCH_THREAD_STACK_ALLOCATOR

That's an horrible ifdef maze in that file.

Thanks,

	tglx