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SubjectRe: [PATCH 1/7] mm: allocate mm_cpumask dynamically based on nr_cpu_ids
Hi Rik,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.18-rc2 next-20180629]
[cannot apply to tip/x86/core]
[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/20180629-232822
config: s390-debug_defconfig (attached as .config)
compiler: s390x-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
GCC_VERSION=7.2.0 make.cross ARCH=s390

All errors (new ones prefixed by >>):

In file included from arch/s390/include/asm/fpu/internal.h:12:0,
from arch/s390/include/asm/processor.h:47,
from arch/s390/include/asm/thread_info.h:25,
from include/linux/thread_info.h:38,
from arch/s390/include/asm/preempt.h:6,
from include/linux/preempt.h:81,
from include/linux/spinlock.h:51,
from include/linux/seqlock.h:36,
from include/linux/time.h:6,
from include/linux/stat.h:19,
from include/linux/module.h:10,
from init/main.c:16:
In function 'memset',
inlined from 'start_kernel' at include/linux/bitmap.h:208:3:
>> include/linux/string.h:327:3: error: call to '__write_overflow' declared with attribute error: detected write beyond size of object passed as 1st parameter
__write_overflow();
^~~~~~~~~~~~~~~~~~

vim +/__write_overflow +327 include/linux/string.h

6974f0c4 Daniel Micay 2017-07-12 322
6974f0c4 Daniel Micay 2017-07-12 323 __FORTIFY_INLINE void *memset(void *p, int c, __kernel_size_t size)
6974f0c4 Daniel Micay 2017-07-12 324 {
6974f0c4 Daniel Micay 2017-07-12 325 size_t p_size = __builtin_object_size(p, 0);
6974f0c4 Daniel Micay 2017-07-12 326 if (__builtin_constant_p(size) && p_size < size)
6974f0c4 Daniel Micay 2017-07-12 @327 __write_overflow();
6974f0c4 Daniel Micay 2017-07-12 328 if (p_size < size)
6974f0c4 Daniel Micay 2017-07-12 329 fortify_panic(__func__);
6974f0c4 Daniel Micay 2017-07-12 330 return __builtin_memset(p, c, size);
6974f0c4 Daniel Micay 2017-07-12 331 }
6974f0c4 Daniel Micay 2017-07-12 332

:::::: The code at line 327 was first introduced by commit
:::::: 6974f0c4555e285ab217cee58b6e874f776ff409 include/linux/string.h: add the option of fortified string.h functions

:::::: TO: Daniel Micay <danielmicay@gmail.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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