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SubjectRe: [PATCH v3 3/7] mm/memory_hotplug: prepare passing flags to add_memory() and friends
Hi David,

I love your patch! Perhaps something to improve:

[auto build test WARNING on next-20200909]
[cannot apply to mmotm/master hnaz-linux-mm/master xen-tip/linux-next powerpc/next linus/master v5.9-rc4 v5.9-rc3 v5.9-rc2 v5.9-rc4]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in]

base: 7204eaa2c1f509066486f488c9dcb065d7484494
:::::: branch date: 9 hours ago
:::::: commit date: 9 hours ago
config: powerpc-randconfig-r011-20200909 (attached as .config)
compiler: clang version 12.0.0 ( 0a5dc7effb191eff740e0e7ae7bd8e1f6bdb3ad9)
reproduce (this is a W=1 build):
wget -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install powerpc cross compiling tool for clang build
# apt-get install binutils-powerpc-linux-gnu
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <>

All warnings (new ones prefixed by >>):

In file included from arch/powerpc/kernel/asm-offsets.c:14:
In file included from include/linux/compat.h:17:
In file included from include/linux/fs.h:15:
In file included from include/linux/radix-tree.h:18:
In file included from include/linux/xarray.h:14:
In file included from include/linux/gfp.h:6:
In file included from include/linux/mmzone.h:853:
include/linux/memory_hotplug.h:354:55: error: unknown type name 'mhp_t'
extern int __add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags);
include/linux/memory_hotplug.h:355:53: error: unknown type name 'mhp_t'
extern int add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags);
include/linux/memory_hotplug.h:357:11: error: unknown type name 'mhp_t'
mhp_t mhp_flags);
include/linux/memory_hotplug.h:360:10: error: unknown type name 'mhp_t'
mhp_t mhp_flags);
In file included from arch/powerpc/kernel/asm-offsets.c:21:
>> include/linux/mman.h:137:9: warning: division by zero is undefined [-Wdivision-by-zero]
_calc_vm_trans(flags, MAP_LOCKED, VM_LOCKED ) |
include/linux/mman.h:115:21: note: expanded from macro '_calc_vm_trans'
: ((x) & (bit1)) / ((bit1) / (bit2))))
^ ~~~~~~~~~~~~~~~~~
include/linux/mman.h:138:9: warning: division by zero is undefined [-Wdivision-by-zero]
_calc_vm_trans(flags, MAP_SYNC, VM_SYNC );
include/linux/mman.h:115:21: note: expanded from macro '_calc_vm_trans'
: ((x) & (bit1)) / ((bit1) / (bit2))))
^ ~~~~~~~~~~~~~~~~~
2 warnings and 4 errors generated.
make[2]: *** [scripts/ arch/powerpc/kernel/asm-offsets.s] Error 1
make[2]: Target '__build' not remade because of errors.
make[1]: *** [Makefile:1196: prepare0] Error 2
make[1]: Target 'prepare' not remade because of errors.
make: *** [Makefile:185: __sub-make] Error 2
make: Target 'prepare' not remade because of errors.

git remote add linux-review
git fetch --no-tags linux-review David-Hildenbrand/mm-memory_hotplug-selective-merging-of-system-ram-resources/20200910-171630
git checkout d88270d1c0783a7f99f24a85692be90fd2ae0d7d
vim +137 include/linux/mman.h

^1da177e4c3f41 Linus Torvalds 2005-04-16 128
^1da177e4c3f41 Linus Torvalds 2005-04-16 129 /*
^1da177e4c3f41 Linus Torvalds 2005-04-16 130 * Combine the mmap "flags" argument into "vm_flags" used internally.
^1da177e4c3f41 Linus Torvalds 2005-04-16 131 */
^1da177e4c3f41 Linus Torvalds 2005-04-16 132 static inline unsigned long
^1da177e4c3f41 Linus Torvalds 2005-04-16 133 calc_vm_flag_bits(unsigned long flags)
^1da177e4c3f41 Linus Torvalds 2005-04-16 134 {
^1da177e4c3f41 Linus Torvalds 2005-04-16 135 return _calc_vm_trans(flags, MAP_GROWSDOWN, VM_GROWSDOWN ) |
^1da177e4c3f41 Linus Torvalds 2005-04-16 136 _calc_vm_trans(flags, MAP_DENYWRITE, VM_DENYWRITE ) |
b6fb293f2497a9 Jan Kara 2017-11-01 @137 _calc_vm_trans(flags, MAP_LOCKED, VM_LOCKED ) |
b6fb293f2497a9 Jan Kara 2017-11-01 138 _calc_vm_trans(flags, MAP_SYNC, VM_SYNC );
^1da177e4c3f41 Linus Torvalds 2005-04-16 139 }
00619bcc44d6b7 Jerome Marchand 2013-11-12 140

0-DAY CI Kernel Test Service, Intel Corporation
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