Re: [PATCH] mm: Fix a huge pud insertion race during faulting

From: kbuild test robot
Date: Thu Oct 24 2019 - 06:36:34 EST


Hi "Thomas,

I love your patch! Yet something to improve:

[auto build test ERROR on mmotm/master]

url: https://github.com/0day-ci/linux/commits/Thomas-Hellstr-m-VMware/mm-Fix-a-huge-pud-insertion-race-during-faulting/20191024-175905
base: git://git.cmpxchg.org/linux-mmotm.git master
config: i386-tinyconfig (attached as .config)
compiler: gcc-7 (Debian 7.4.0-14) 7.4.0
reproduce:
# save the attached .config to linux build tree
make ARCH=i386

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

In file included from arch/x86/include/asm/pgtable.h:1466:0,
from include/linux/mm.h:99,
from include/linux/memcontrol.h:20,
from include/linux/swap.h:9,
from include/linux/suspend.h:5,
from arch/x86/kernel/asm-offsets.c:13:
include/asm-generic/pgtable.h: In function 'pud_none_or_trans_huge_or_dev_or_clear_bad':
>> include/asm-generic/pgtable.h:920:52: error: implicit declaration of function 'pud_devmap'; did you mean 'pud_mkdevmap'? [-Werror=implicit-function-declaration]
if (pud_none(pudval) || pud_trans_huge(pudval) || pud_devmap(pudval))
^~~~~~~~~~
pud_mkdevmap
In file included from include/linux/memcontrol.h:20:0,
from include/linux/swap.h:9,
from include/linux/suspend.h:5,
from arch/x86/kernel/asm-offsets.c:13:
include/linux/mm.h: At top level:
>> include/linux/mm.h:572:19: error: static declaration of 'pud_devmap' follows non-static declaration
static inline int pud_devmap(pud_t pud)
^~~~~~~~~~
In file included from arch/x86/include/asm/pgtable.h:1466:0,
from include/linux/mm.h:99,
from include/linux/memcontrol.h:20,
from include/linux/swap.h:9,
from include/linux/suspend.h:5,
from arch/x86/kernel/asm-offsets.c:13:
include/asm-generic/pgtable.h:920:52: note: previous implicit declaration of 'pud_devmap' was here
if (pud_none(pudval) || pud_trans_huge(pudval) || pud_devmap(pudval))
^~~~~~~~~~
cc1: some warnings being treated as errors
make[2]: *** [arch/x86/kernel/asm-offsets.s] Error 1
make[2]: Target '__build' not remade because of errors.
make[1]: *** [prepare0] Error 2
make[1]: Target 'prepare' not remade because of errors.
make: *** [sub-make] Error 2
13 real 5 user 3 sys 72.35% cpu make prepare

vim +920 include/asm-generic/pgtable.h

914
915 /* See pmd_none_or_trans_huge_or_clear_bad for discussion. */
916 static inline int pud_none_or_trans_huge_or_dev_or_clear_bad(pud_t *pud)
917 {
918 pud_t pudval = READ_ONCE(*pud);
919
> 920 if (pud_none(pudval) || pud_trans_huge(pudval) || pud_devmap(pudval))
921 return 1;
922 if (unlikely(pud_bad(pudval))) {
923 pud_clear_bad(pud);
924 return 1;
925 }
926 return 0;
927 }
928

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