[09/10] mm: remove the unused MIGRATE_PFN_DEVICE flag

Submitted by Christoph Hellwig on Aug. 14, 2019, 7:59 a.m.

Details

Message ID 20190814075928.23766-10-hch@lst.de
State New
Headers show
Series "Series without cover letter" ( rev: 2 1 ) in Nouveau

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Commit Message

Christoph Hellwig Aug. 14, 2019, 7:59 a.m.
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(-)

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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 {

Comments

On Wed, Aug 14, 2019 at 09:59:27AM +0200, Christoph Hellwig wrote:
> 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(-)

Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>

Jason