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authorMiaohe Lin <linmiaohe@huawei.com>2022-05-30 19:30:15 +0800
committerakpm <akpm@linux-foundation.org>2022-07-03 18:08:37 -0700
commit7ce82f4c3f3ead13a9d9498768e3b1a79975c4d8 (patch)
tree8fc94acafcb7bceb9f621a00a34072fc0443021e /mm/gup.c
parent160088b3b6d7946e456caa379dcdfc8702c66274 (diff)
mm/migration: return errno when isolate_huge_page failed
We might fail to isolate huge page due to e.g. the page is under migration which cleared HPageMigratable. We should return errno in this case rather than always return 1 which could confuse the user, i.e. the caller might think all of the memory is migrated while the hugetlb page is left behind. We make the prototype of isolate_huge_page consistent with isolate_lru_page as suggested by Huang Ying and rename isolate_huge_page to isolate_hugetlb as suggested by Muchun to improve the readability. Link: https://lkml.kernel.org/r/20220530113016.16663-4-linmiaohe@huawei.com Fixes: e8db67eb0ded ("mm: migrate: move_pages() supports thp migration") Signed-off-by: Miaohe Lin <linmiaohe@huawei.com> Suggested-by: Huang Ying <ying.huang@intel.com> Reported-by: kernel test robot <lkp@intel.com> (build error) Cc: Alistair Popple <apopple@nvidia.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Christoph Lameter <cl@linux.com> Cc: David Hildenbrand <david@redhat.com> Cc: David Howells <dhowells@redhat.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Muchun Song <songmuchun@bytedance.com> Cc: Oscar Salvador <osalvador@suse.de> Cc: Peter Xu <peterx@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/gup.c')
-rw-r--r--mm/gup.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/gup.c b/mm/gup.c
index 407a81d5ca03..3129b754ade3 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1930,7 +1930,7 @@ static long check_and_migrate_movable_pages(unsigned long nr_pages,
* Try to move out any movable page before pinning the range.
*/
if (folio_test_hugetlb(folio)) {
- if (!isolate_huge_page(&folio->page,
+ if (isolate_hugetlb(&folio->page,
&movable_page_list))
isolation_error_count++;
continue;