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

From: Stephen Rothwell <[email-masked]>
Date: Wed, 10 Mar 2021 14:16:06 +1100

Hi all,

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

mm/shmem.c:2365:12: warning: 'enum mcopy_atomic_mode' declared inside parameter list will not be visible outside of this definition or declaration
 2365 |       enum mcopy_atomic_mode mode, struct page **pagep)
      |            ^~~~~~~~~~~~~~~~~
mm/shmem.c:2365:30: error: parameter 6 ('mode') has incomplete type
 2365 |       enum mcopy_atomic_mode mode, struct page **pagep)
      |       ~~~~~~~~~~~~~~~~~~~~~~~^~~~
mm/shmem.c:2362:5: error: function declaration isn't a prototype [-Werror=strict-prototypes]
 2362 | int shmem_mcopy_atomic_pte(struct mm_struct *dst_mm, pmd_t *dst_pmd,
      |     ^~~~~~~~~~~~~~~~~~~~~~
mm/shmem.c: In function 'shmem_mcopy_atomic_pte':
mm/shmem.c:2367:30: error: 'MCOPY_ATOMIC_CONTINUE' undeclared (first use in this function)
 2367 |  bool is_continue = (mode == MCOPY_ATOMIC_CONTINUE);
      |                              ^~~~~~~~~~~~~~~~~~~~~
mm/shmem.c:2367:30: note: each undeclared identifier is reported only once for each function it appears in
mm/shmem.c:2394:15: error: 'MCOPY_ATOMIC_NORMAL' undeclared (first use in this function)
 2394 |   if (mode == MCOPY_ATOMIC_NORMAL) { /* mcopy_atomic */
      |               ^~~~~~~~~~~~~~~~~~~

Caused by commit

  3407bec05d6d ("userfaultfd: support minor fault handling for shmem")

# CONFIG_USERFAULTFD is not set

I have reverted that commit (and the following 4 as well).
-- 
Cheers,
Stephen Rothwell