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Subjectlinux-next: build failure after merge of the akpm-current tree
Hi all,

After merging the akpm-current tree, today's linux-next build (x86_64
allmodconfig) failed like this:

drivers/gpu/drm/nouveau/nouveau_dmem.c:299:11: error: initialization of 'vm_fault_t (*)(struct hmm_devmem *, struct vm_area_struct *, long unsigned int, const struct page *, unsigned int, pmd_t *)' {aka 'unsigned int (*)(struct hmm_devmem *, struct vm_area_struct *, long unsigned int, const struct page *, unsigned int, struct <anonymous> *)'} from incompatible pointer type 'int (*)(struct hmm_devmem *, struct vm_area_struct *, long unsigned int, const struct page *, unsigned int, pmd_t *)' {aka 'int (*)(struct hmm_devmem *, struct vm_area_struct *, long unsigned int, const struct page *, unsigned int, struct <anonymous> *)'} [-Werror=incompatible-pointer-types]
.fault = nouveau_dmem_fault,
^~~~~~~~~~~~~~~~~~
drivers/gpu/drm/nouveau/nouveau_dmem.c:299:11: note: (near initialization for 'nouveau_dmem_devmem_ops.fault')

Caused by commit

5be73b690875 ("drm/nouveau/dmem: device memory helpers for SVM")

from the drm tree interacting with commit

ed814eb7f91d ("mm/hmm: convert to use vm_fault_t")

from the akpm-current tree.

I added this merge fix patch:

From: Stephen Rothwell <sfr@canb.auug.org.au>
Date: Wed, 20 Feb 2019 17:36:18 +1100
Subject: [PATCH] drm/nouveau/dmem: update for struct hmm_devmem_ops member
change

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
---
drivers/gpu/drm/nouveau/nouveau_dmem.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_dmem.c b/drivers/gpu/drm/nouveau/nouveau_dmem.c
index 8be7a83ced9b..e2539f64de60 100644
--- a/drivers/gpu/drm/nouveau/nouveau_dmem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_dmem.c
@@ -261,7 +261,7 @@ static const struct migrate_vma_ops nouveau_dmem_fault_migrate_ops = {
.finalize_and_map = nouveau_dmem_fault_finalize_and_map,
};

-static int
+static vm_fault_t
nouveau_dmem_fault(struct hmm_devmem *devmem,
struct vm_area_struct *vma,
unsigned long addr,
--
2.20.1
--
Cheers,
Stephen Rothwell
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