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Date: Sun, 12 Feb 2017 10:44:43 +0900
From: Hoeun Ryu <hoeun.ryu@...il.com>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: 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 Feb 12, 2017, at 5:19 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
>
>> 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.
>
I think we should rollback to v4. Do you agree?
> Thanks,
>
> tglx
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