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mm: migrate_device: use a folio in migrate_device_range()

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Save two calls to compound_head() and use folio throughout.

Link: https://lkml.kernel.org/r/20240826065814.1336616-3-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Acked-by: David Hildenbrand <david@redhat.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: 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>
This commit is contained in:
Kefeng Wang 2024-08-26 14:58:10 +08:00 committed by Andrew Morton
parent 5c8525a37b
commit 53456b7b3f
1 changed files with 5 additions and 4 deletions
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9
mm/migrate_device.c
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@ -898,16 +898,17 @@ int migrate_device_range(unsigned long *src_pfns, unsigned long start,
unsigned long i, pfn;
for (pfn = start, i = 0; i < npages; pfn++, i++) {
struct page *page = pfn_to_page(pfn);
struct folio *folio;
if (!get_page_unless_zero(page)) {
folio = folio_get_nontail_page(pfn_to_page(pfn));
if (!folio) {
src_pfns[i] = 0;
continue;
}
if (!trylock_page(page)) {
if (!folio_trylock(folio)) {
src_pfns[i] = 0;
put_page(page);
folio_put(folio);
continue;
}