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Subject[PATCH 09/10] mm: remove the unused MIGRATE_PFN_DEVICE flag
Date
No one ever checks this flag, and we could easily get that information
from the page if needed.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ralph Campbell <rcampbell@nvidia.com>
---
drivers/gpu/drm/nouveau/nouveau_dmem.c | 3 +--
include/linux/migrate.h | 1 -
mm/migrate.c | 4 ++--
3 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_dmem.c b/drivers/gpu/drm/nouveau/nouveau_dmem.c
index d96b987b9982..fa1439941596 100644
--- a/drivers/gpu/drm/nouveau/nouveau_dmem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_dmem.c
@@ -580,8 +580,7 @@ static unsigned long nouveau_dmem_migrate_copy_one(struct nouveau_drm *drm,
*dma_addr))
goto out_dma_unmap;

- return migrate_pfn(page_to_pfn(dpage)) |
- MIGRATE_PFN_LOCKED | MIGRATE_PFN_DEVICE;
+ return migrate_pfn(page_to_pfn(dpage)) | MIGRATE_PFN_LOCKED;

out_dma_unmap:
dma_unmap_page(dev, *dma_addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index 1e67dcfd318f..72120061b7d4 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -166,7 +166,6 @@ static inline int migrate_misplaced_transhuge_page(struct mm_struct *mm,
#define MIGRATE_PFN_MIGRATE (1UL << 1)
#define MIGRATE_PFN_LOCKED (1UL << 2)
#define MIGRATE_PFN_WRITE (1UL << 3)
-#define MIGRATE_PFN_DEVICE (1UL << 4)
#define MIGRATE_PFN_SHIFT 6

static inline struct page *migrate_pfn_to_page(unsigned long mpfn)
diff --git a/mm/migrate.c b/mm/migrate.c
index e2565374d330..33e063c28c1b 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2237,8 +2237,8 @@ static int migrate_vma_collect_pmd(pmd_t *pmdp,
goto next;

page = device_private_entry_to_page(entry);
- mpfn = migrate_pfn(page_to_pfn(page))|
- MIGRATE_PFN_DEVICE | MIGRATE_PFN_MIGRATE;
+ mpfn = migrate_pfn(page_to_pfn(page)) |
+ MIGRATE_PFN_MIGRATE;
if (is_write_device_private_entry(entry))
mpfn |= MIGRATE_PFN_WRITE;
} else {
--
2.20.1
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