Subject: linux-next: build failure after merge of the mm tree

From: Stephen Rothwell <[email-masked]>
Date: Thu, 15 Sep 2022 17:07:58 +1000

Hi all,

After merging the mm tree, today's linux-next build (powerpc
ppc64_defconfig) failed like this:

ld: warning: discarding dynamic section .glink
ld: warning: discarding dynamic section .plt
ld: linkage table error against `hugetlb_vma_lock_release'
ld: stubs don't match calculated size
ld: can not build stubs: bad value
ld: fs/hugetlbfs/inode.o: in function `.remove_inode_hugepages':
inode.c:(.text+0x2538): undefined reference to `.hugetlb_vma_lock_release'
ld: inode.c:(.text+0x25f4): undefined reference to `.hugetlb_vma_lock_release'

Caused by commits

  d56100904028 ("hugetlb: use new vma_lock for pmd sharing synchronization")
  47bc61e7caf9 ("hugetlb: add vma based lock for pmd sharing")

The definition of hugetlb_vma_lock_release() is guarded by
CONFIG_ARCH_WANT_HUGE_PMD_SHARE, but the usage in fs/hugetlbfs/inode.c
is not.

I have reverted commit d56100904028 (and the following commit) for
today.
-- 
Cheers,
Stephen Rothwell