Re: [PATCH] mm, fork: make dup_mmap wait for mmap_sem for write killable

From: kbuild test robot
Date: Mon Feb 29 2016 - 15:14:03 EST


Hi Michal,

[auto build test ERROR on v4.5-rc6]
[also build test ERROR on next-20160229]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url: https://github.com/0day-ci/linux/commits/Michal-Hocko/mm-fork-make-dup_mmap-wait-for-mmap_sem-for-write-killable/20160301-021107
config: x86_64-lkp (attached as .config)
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64

All errors (new ones prefixed by >>):

kernel/fork.c: In function 'dup_mmap':
>> kernel/fork.c:405:2: error: implicit declaration of function 'down_write_killable' [-Werror=implicit-function-declaration]
if (down_write_killable(&oldmm->mmap_sem)) {
^
cc1: some warnings being treated as errors

vim +/down_write_killable +405 kernel/fork.c

399 struct vm_area_struct *mpnt, *tmp, *prev, **pprev;
400 struct rb_node **rb_link, *rb_parent;
401 int retval;
402 unsigned long charge;
403
404 uprobe_start_dup_mmap();
> 405 if (down_write_killable(&oldmm->mmap_sem)) {
406 retval = -EINTR;
407 goto fail_uprobe_end;
408 }

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