6.1-stable review patch. If anyone has any objections, please let me know.
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From: Kefeng Wang wangkefeng.wang@huawei.com
commit 58bf8c2bf47550bc94fea9cafd2bc7304d97102c upstream.
Saves a couple of calls to compound_head() and remove last two callers of putback_lru_page().
Link: https://lkml.kernel.org/r/20240826065814.1336616-5-wangkefeng.wang@huawei.co... Signed-off-by: Kefeng Wang wangkefeng.wang@huawei.com Reviewed-by: Vishal Moola (Oracle) vishal.moola@gmail.com Reviewed-by: Alistair Popple apopple@nvidia.com Cc: Baolin Wang baolin.wang@linux.alibaba.com Cc: David Hildenbrand david@redhat.com Cc: Jonathan Corbet corbet@lwn.net Cc: Matthew Wilcox (Oracle) willy@infradead.org Cc: Zi Yan ziy@nvidia.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: David Hildenbrand david@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- mm/migrate_device.c | 41 ++++++++++++++++++++++------------------- 1 file changed, 22 insertions(+), 19 deletions(-)
--- a/mm/migrate_device.c +++ b/mm/migrate_device.c @@ -829,42 +829,45 @@ void migrate_device_finalize(unsigned lo unsigned long i;
for (i = 0; i < npages; i++) { - struct folio *dst, *src; + struct folio *dst = NULL, *src = NULL; struct page *newpage = migrate_pfn_to_page(dst_pfns[i]); struct page *page = migrate_pfn_to_page(src_pfns[i]);
+ if (newpage) + dst = page_folio(newpage); + if (!page) { - if (newpage) { - unlock_page(newpage); - put_page(newpage); + if (dst) { + folio_unlock(dst); + folio_put(dst); } continue; }
- if (!(src_pfns[i] & MIGRATE_PFN_MIGRATE) || !newpage) { - if (newpage) { - unlock_page(newpage); - put_page(newpage); + src = page_folio(page); + + if (!(src_pfns[i] & MIGRATE_PFN_MIGRATE) || !dst) { + if (dst) { + folio_unlock(dst); + folio_put(dst); } - newpage = page; + dst = src; }
- src = page_folio(page); - dst = page_folio(newpage); remove_migration_ptes(src, dst, false); folio_unlock(src);
- if (is_zone_device_page(page)) - put_page(page); + if (folio_is_zone_device(src)) + folio_put(src); else - putback_lru_page(page); + folio_putback_lru(src);
- if (newpage != page) { - unlock_page(newpage); - if (is_zone_device_page(newpage)) - put_page(newpage); + if (dst != src) { + folio_unlock(dst); + if (folio_is_zone_device(dst)) + folio_put(dst); else - putback_lru_page(newpage); + folio_putback_lru(dst); } } }