mm/memory-failure: fix comment of get_hwpoison_page()

When return value is 0, it could also means the page is free hugetlb page
or free buddy page.  Fix the corresponding comment.

Link: https://lkml.kernel.org/r/20240612071835.157004-12-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Borislav Petkov (AMD) <bp@alien8.de>
Cc: David Hildenbrand <david@redhat.com>
Cc: kernel test robot <lkp@intel.com>
Cc: Naoya Horiguchi <nao.horiguchi@gmail.com>
Cc: Tony Luck <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index bb8e79381c1f63bf81208799cf9142760abb98f0..475524f795501718142f3f78350f34632aadfc63 100644 (file)
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1525,7 +1525,7 @@ static int __get_unpoison_page(struct page *page)
  * the given page has PG_hwpoison. So it's never reused for other page
  * allocations, and __get_unpoison_page() never races with them.
  *
- * Return: 0 on failure,
+ * Return: 0 on failure or free buddy (hugetlb) page,
  *         1 on success for in-use pages in a well-defined state,
  *         -EIO for pages on which we can not handle memory errors,
  *         -EBUSY when get_hwpoison_page() has raced with page lifecycle