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| author | Christoph Hellwig <hch@lst.de> | 2022-02-16 05:31:35 +0100 |
|---|---|---|
| committer | Matthew Wilcox (Oracle) <willy@infradead.org> | 2022-03-03 18:47:33 +0100 |
| commit | 75e55d8a107edb2fd6e02b1fa8a81531209cda04 (patch) | |
| tree | 848329e297933a7a4a44bb548d58025b0286f57d /mm/memremap.c | |
| parent | mm: remove pointless includes from <linux/hmm.h> (diff) | |
| download | linux-75e55d8a107edb2fd6e02b1fa8a81531209cda04.tar.xz linux-75e55d8a107edb2fd6e02b1fa8a81531209cda04.zip | |
mm: move free_devmap_managed_page to memremap.c
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>
Diffstat (limited to 'mm/memremap.c')
| -rw-r--r-- | mm/memremap.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/mm/memremap.c b/mm/memremap.c index 5f04a0709e43..55d23e9f5c04 100644 --- a/mm/memremap.c +++ b/mm/memremap.c @@ -501,4 +501,25 @@ void free_devmap_managed_page(struct page *page) page->mapping = NULL; 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 */ |