mm/memory-failure: convert try_memory_failure_hugetlb() to folios

Use a struct folio rather than a head page in try_memory_failure_hugetlb.
This converts one user of SetHPageMigratable to the folio equivalent.

Link: https://lkml.kernel.org/r/20230112204608.80136-3-sidhartha.kumar@oracle.com
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index cca28f1..19f6035 100644 (file)
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1860,7 +1860,7 @@ static int try_memory_failure_hugetlb(unsigned long pfn, int flags, int *hugetlb
 {
        int res;
        struct page *p = pfn_to_page(pfn);
-       struct page *head;
+       struct folio *folio;
        unsigned long page_flags;
        bool migratable_cleared = false;
 
@@ -1873,8 +1873,8 @@ retry:
        } else if (res == -EHWPOISON) {
                pr_err("%#lx: already hardware poisoned\n", pfn);
                if (flags & MF_ACTION_REQUIRED) {
-                       head = compound_head(p);
-                       res = kill_accessing_process(current, page_to_pfn(head), flags);
+                       folio = page_folio(p);
+                       res = kill_accessing_process(current, folio_pfn(folio), flags);
                }
                return res;
        } else if (res == -EBUSY) {
@@ -1885,16 +1885,16 @@ retry:
                return action_result(pfn, MF_MSG_UNKNOWN, MF_IGNORED);
        }
 
-       head = compound_head(p);
-       lock_page(head);
+       folio = page_folio(p);
+       folio_lock(folio);
 
        if (hwpoison_filter(p)) {
-               hugetlb_clear_page_hwpoison(head);
+               hugetlb_clear_page_hwpoison(&folio->page);
                if (migratable_cleared)
-                       SetHPageMigratable(head);
-               unlock_page(head);
+                       folio_set_hugetlb_migratable(folio);
+               folio_unlock(folio);
                if (res == 1)
-                       put_page(head);
+                       folio_put(folio);
                return -EOPNOTSUPP;
        }
 
@@ -1903,7 +1903,7 @@ retry:
         * or demotion can be prevented by PageHWPoison flag.
         */
        if (res == 0) {
-               unlock_page(head);
+               folio_unlock(folio);
                if (__page_handle_poison(p) >= 0) {
                        page_ref_inc(p);
                        res = MF_RECOVERED;
@@ -1913,10 +1913,10 @@ retry:
                return action_result(pfn, MF_MSG_FREE_HUGE, res);
        }
 
-       page_flags = head->flags;
+       page_flags = folio->flags;
 
-       if (!hwpoison_user_mappings(p, pfn, flags, head)) {
-               unlock_page(head);
+       if (!hwpoison_user_mappings(p, pfn, flags, &folio->page)) {
+               folio_unlock(folio);
                return action_result(pfn, MF_MSG_UNMAP_FAILED, MF_IGNORED);
        }