Hi Andrew, After merging the akpm tree, today's linux-next build (x86_64 allmodconfig) failed like this:
mm/migrate.c: In function 'migrate_vma_insert_page': mm/migrate.c:2491:23: error: passing argument 2 of 'pud_alloc' from incompatible pointer type [-Werror=incompatible-pointer-types] pudp = pud_alloc(mm, pgdp, addr); ^ In file included from include/linux/migrate.h:4:0, from mm/migrate.c:15: include/linux/mm.h:1677:22: note: expected 'p4d_t * {aka struct <anonymous> *}' but argument is of type 'pgd_t * {aka struct <anonymous> *}' static inline pud_t *pud_alloc(struct mm_struct *mm, p4d_t *p4d, ^ Caused by patch "mm/migrate: allow migrate_vma() to alloc new page on empty entry" interacting with commit c2febafc6773 ("mm: convert generic code to 5-level paging") from Linus' tree (v4.11-rc2). I applied the following fix patch: From: Stephen Rothwell <s...@canb.auug.org.au> Date: Mon, 10 Apr 2017 17:09:15 +1000 Subject: [PATCH] mm/migrate: allow migrate_vma() to alloc new page on empty entry fix Signed-off-by: Stephen Rothwell <s...@canb.auug.org.au> --- mm/migrate.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/mm/migrate.c b/mm/migrate.c index e4b555f9a689..7958dfa01b16 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2478,6 +2478,7 @@ static void migrate_vma_insert_page(struct migrate_vma *migrate, struct mem_cgroup *memcg; spinlock_t *ptl; pgd_t *pgdp; + p4d_t *p4dp; pud_t *pudp; pmd_t *pmdp; pte_t *ptep; @@ -2488,7 +2489,10 @@ static void migrate_vma_insert_page(struct migrate_vma *migrate, goto abort; pgdp = pgd_offset(mm, addr); - pudp = pud_alloc(mm, pgdp, addr); + p4dp = p4d_alloc(mm, pgdp, addr); + if (!p4dp) + goto abort; + pudp = pud_alloc(mm, p4dp, addr); if (!pudp) goto abort; pmdp = pmd_alloc(mm, pudp, addr); -- 2.11.0 -- Cheers, Stephen Rothwell