+ fs-hugetlbfs-support-poisoned-recover-from-hugetlbfs_migrate_folio.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

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The patch titled
     Subject: fs: hugetlbfs: support poisoned recover from hugetlbfs_migrate_folio()
has been added to the -mm mm-unstable branch.  Its filename is
     fs-hugetlbfs-support-poisoned-recover-from-hugetlbfs_migrate_folio.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/fs-hugetlbfs-support-poisoned-recover-from-hugetlbfs_migrate_folio.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Kefeng Wang <wangkefeng.wang@huawei.com>
Subject: fs: hugetlbfs: support poisoned recover from hugetlbfs_migrate_folio()
Date: Wed, 26 Jun 2024 16:53:27 +0800

This is similar to __migrate_folio(), use folio_mc_copy() in HugeTLB folio
migration to avoid panic when copy from poisoned folio.

Link: https://lkml.kernel.org/r/20240626085328.608006-6-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jane Chu <jane.chu@oracle.com>
Cc: Jérôme Glisse <jglisse@redhat.com>
Cc: Jiaqi Yan <jiaqiyan@google.com>
Cc: Lance Yang <ioworker0@gmail.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Naoya Horiguchi <nao.horiguchi@gmail.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/hugetlbfs/inode.c |    2 +-
 mm/migrate.c         |   10 ++++++++--
 2 files changed, 9 insertions(+), 3 deletions(-)

--- a/fs/hugetlbfs/inode.c~fs-hugetlbfs-support-poisoned-recover-from-hugetlbfs_migrate_folio
+++ a/fs/hugetlbfs/inode.c
@@ -1128,7 +1128,7 @@ static int hugetlbfs_migrate_folio(struc
 		hugetlb_set_folio_subpool(src, NULL);
 	}
 
-	folio_migrate_copy(dst, src);
+	folio_migrate_flags(dst, src);
 
 	return MIGRATEPAGE_SUCCESS;
 }
--- a/mm/migrate.c~fs-hugetlbfs-support-poisoned-recover-from-hugetlbfs_migrate_folio
+++ a/mm/migrate.c
@@ -537,10 +537,16 @@ int migrate_huge_page_move_mapping(struc
 				   struct folio *dst, struct folio *src)
 {
 	XA_STATE(xas, &mapping->i_pages, folio_index(src));
-	int expected_count;
+	int rc, expected_count = folio_expected_refs(mapping, src);
+
+	if (folio_ref_count(src) != expected_count)
+		return -EAGAIN;
+
+	rc = folio_mc_copy(dst, src);
+	if (unlikely(rc))
+		return rc;
 
 	xas_lock_irq(&xas);
-	expected_count = folio_expected_refs(mapping, src);
 	if (!folio_ref_freeze(src, expected_count)) {
 		xas_unlock_irq(&xas);
 		return -EAGAIN;
_

Patches currently in -mm which might be from wangkefeng.wang@huawei.com are

fs-proc-task_mmu-use-folio-api-in-pte_is_pinned.patch
mm-remove-page_maybe_dma_pinned.patch
mm-remove-page_maybe_dma_pinned-fix.patch
fb_defio-use-a-folio-in-fb_deferred_io_work.patch
mm-remove-page_mkclean.patch
mm-memory-convert-clear_huge_page-to-folio_zero_user.patch
mm-memory-use-folio-in-struct-copy_subpage_arg.patch
mm-memory-improve-copy_user_large_folio.patch
mm-memory-rename-pages_per_huge_page-to-nr_pages.patch
mm-move-memory_failure_queue-into-copy_mc__highpage.patch
mm-add-folio_mc_copy.patch
mm-migrate-split-folio_migrate_mapping.patch
mm-migrate-support-poisoned-recover-from-migrate-folio.patch
fs-hugetlbfs-support-poisoned-recover-from-hugetlbfs_migrate_folio.patch
mm-migrate-remove-folio_migrate_copy.patch