Date: Sun, 12 Feb 2017 13:19:43 +0100 (CET) From: Thomas Gleixner <tglx@...utronix.de> To: Hoeun Ryu <hoeun.ryu@...il.com> 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 Sun, 12 Feb 2017, Hoeun Ryu wrote: > > > 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? Sigh. Yes.
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