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Message-ID: <ef44f3bf-0f99-c76b-bf4b-6770545b5e38@nvidia.com>
Date: Mon, 29 Jul 2019 16:31:21 -0700
From: Ralph Campbell <rcampbell@...dia.com>
To: Christoph Hellwig <hch@....de>,
Jérôme Glisse <jglisse@...hat.com>,
Jason Gunthorpe <jgg@...lanox.com>,
Ben Skeggs <bskeggs@...hat.com>
CC: Bharata B Rao <bharata@...ux.ibm.com>,
Andrew Morton <akpm@...ux-foundation.org>,
<linux-mm@...ck.org>, <nouveau@...ts.freedesktop.org>,
<dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 8/9] mm: remove the unused MIGRATE_PFN_DEVICE flag
On 7/29/19 7:28 AM, 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@....de>
Reviewed-by: Ralph Campbell <rcampbell@...dia.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 6cb930755970..f04686a2c21f 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_dmem.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_dmem.c
> @@ -582,8 +582,7 @@ 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 229153c2c496..8b46cfdb1a0e 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 dc4e60a496f2..74735256e260 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 {
>
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