[merged] mm-handle-zone-device-pages-in-release_pages.patch removed from -mm tree

[merged] mm-handle-zone-device-pages-in-release_pages.patch removed from -mm tree

[akpm]

The patch titled
     Subject: mm: handle zone device pages in release_pages()
has been removed from the -mm tree.  Its filename was
     mm-handle-zone-device-pages-in-release_pages.patch

This patch was dropped because it was merged into mainline or a subsystem tree

------------------------------------------------------
From: Ralph Campbell <rcampbell@nvidia.com>
Subject: mm: handle zone device pages in release_pages()

release_pages() is an optimized, inlined version of __put_pages() except
that zone device struct pages that are not page_is_devmap_managed() (i.e.,
memory_type MEMORY_DEVICE_GENERIC and MEMORY_DEVICE_PCI_P2PDMA), fall
through to the code that could return the zone device page to the page
allocator instead of adjusting the pgmap reference count.

Clearly these type of pages are not having the reference count decremented
to zero via release_pages() or page allocation problems would be seen. 
Just to be safe, handle the 1 to zero case in release_pages() like
__put_page() does.

Link: https://lkml.kernel.org/r/20201021194733.11530-1-rcampbell@nvidia.com
Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/swap.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/mm/swap.c~mm-handle-zone-device-pages-in-release_pages
+++ a/mm/swap.c
@@ -909,6 +909,9 @@ void release_pages(struct page **pages,
 				put_devmap_managed_page(page);
 				continue;
 			}
+			if (put_page_testzero(page))
+				put_dev_pagemap(page->pgmap);
+			continue;
 		}
 
 		if (!put_page_testzero(page))
_

Patches currently in -mm which might be from rcampbell@nvidia.com are