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SubjectRe: [PATCH 03/10] mm/hugetlb: Protect follow_huge_(pud|pgd) functions from race
Hi Anshuman,

[auto build test ERROR on powerpc/next]
[also build test ERROR on v4.6-rc2 next-20160407]
[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/Anshuman-Khandual/Enable-HugeTLB-page-migration-on-POWER/20160407-165841
base: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
config: sparc64-allyesconfig (attached as .config)
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=sparc64

All error/warnings (new ones prefixed by >>):

mm/hugetlb.c: In function 'follow_huge_pgd':
>> mm/hugetlb.c:4395:3: error: implicit declaration of function 'pgd_page' [-Werror=implicit-function-declaration]
page = pgd_page(*pgd) + ((address & ~PGDIR_MASK) >> PAGE_SHIFT);
^
>> mm/hugetlb.c:4395:8: warning: assignment makes pointer from integer without a cast
page = pgd_page(*pgd) + ((address & ~PGDIR_MASK) >> PAGE_SHIFT);
^
cc1: some warnings being treated as errors

vim +/pgd_page +4395 mm/hugetlb.c

4389 * make sure that the address range covered by this pgd is not
4390 * unmapped from other threads.
4391 */
4392 if (!pgd_huge(*pgd))
4393 goto out;
4394 if (pgd_present(*pgd)) {
> 4395 page = pgd_page(*pgd) + ((address & ~PGDIR_MASK) >> PAGE_SHIFT);
4396 if (flags & FOLL_GET)
4397 get_page(page);
4398 } else {

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