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mm: move free_devmap_managed_page to memremap.c

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free_devmap_managed_page has nothing to do with the code in swap.c,
move it to live with the rest of the code for devmap handling.

Link: https://lkml.kernel.org/r/20220210072828.2930359-5-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Tested-by: "Sierra Guiza, Alejandro (Alex)" <alex.sierra@amd.com>

Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Christian Knig <christian.koenig@amd.com>
Cc: Felix Kuehling <Felix.Kuehling@amd.com>
Cc: Karol Herbst <kherbst@redhat.com>
Cc: Lyude Paul <lyude@redhat.com>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: "Pan, Xinhui" <Xinhui.Pan@amd.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
This commit is contained in:
Christoph Hellwig 2022-02-16 15:31:35 +11:00 • committed by Matthew Wilcox (Oracle)
parent 730ff52194
commit 75e55d8a10
3 changed files with 21 additions and 24 deletions
Download patch file Download diff file Expand all files Collapse all files

1
include/linux/mm.h
View file

@ -1092,7 +1092,6 @@ static inline bool is_zone_movable_page(const struct page *page)
} }
#ifdef CONFIG_DEV_PAGEMAP_OPS #ifdef CONFIG_DEV_PAGEMAP_OPS
void free_devmap_managed_page(struct page *page);
DECLARE_STATIC_KEY_FALSE(devmap_managed_key); DECLARE_STATIC_KEY_FALSE(devmap_managed_key);
static inline bool page_is_devmap_managed(struct page *page) static inline bool page_is_devmap_managed(struct page *page)

21
mm/memremap.c
View file

@ -501,4 +501,25 @@ void free_devmap_managed_page(struct page *page)
page->mapping = NULL; page->mapping = NULL;
page->pgmap->ops->page_free(page); page->pgmap->ops->page_free(page);
} }
void put_devmap_managed_page(struct page *page)
{
int count;
if (WARN_ON_ONCE(!page_is_devmap_managed(page)))
return;
count = page_ref_dec_return(page);
/*
* devmap page refcounts are 1-based, rather than 0-based: if
* refcount is 1, then the page is free and the refcount is
* stable because nobody holds a reference on the page.
*/
if (count == 1)
free_devmap_managed_page(page);
else if (!count)
__put_page(page);
}
EXPORT_SYMBOL(put_devmap_managed_page);
#endif /* CONFIG_DEV_PAGEMAP_OPS */ #endif /* CONFIG_DEV_PAGEMAP_OPS */

23
mm/swap.c
View file

@ -1154,26 +1154,3 @@ void __init swap_setup(void)
* _really_ don't want to cluster much more * _really_ don't want to cluster much more
*/ */
} }
#ifdef CONFIG_DEV_PAGEMAP_OPS
void put_devmap_managed_page(struct page *page)
{
int count;
if (WARN_ON_ONCE(!page_is_devmap_managed(page)))
return;
count = page_ref_dec_return(page);
/*
* devmap page refcounts are 1-based, rather than 0-based: if
* refcount is 1, then the page is free and the refcount is
* stable because nobody holds a reference on the page.
*/
if (count == 1)
free_devmap_managed_page(page);
else if (!count)
__put_page(page);
}
EXPORT_SYMBOL(put_devmap_managed_page);
#endif