The patch titled From: xu.xin16@zte.com.cn has been added to the -mm mm-hotfixes-unstable branch. Its filename is mm-huge_memory-fix-misused-mapping_large_folio_support-for-anon-folios.patch

This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...

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

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------------------------------------------------------ From: Ran Xiaokai ran.xiaokai@zte.com.cn Subject: mm: huge_memory: fix misused mapping_large_folio_support() for anon folios Date: Fri, 7 Jun 2024 17:40:48 +0800 (CST)

When I did a large folios split test, a WARNING "[ 5059.122759][ T166] Cannot split file folio to non-0 order" was triggered. But the test cases are only for anonmous folios. while mapping_large_folio_support() is only reasonable for page cache folios.

In split_huge_page_to_list_to_order(), the folio passed to mapping_large_folio_support() maybe anonmous folio. The folio_test_anon() check is missing. So the split of the anonmous THP is failed. This is also the same for shmem_mapping(). We'd better add a check for both. But the shmem_mapping() in __split_huge_page() is not involved, as for anonmous folios, the end parameter is set to -1, so (head[i].index >= end) is always false. shmem_mapping() is not called.

Also add a VM_WARN_ON_ONCE() in mapping_large_folio_support() for anon mapping, So we can detect the wrong use more easily.

THP folios maybe exist in the pagecache even the file system doesn't support large folio, it is because when CONFIG_TRANSPARENT_HUGEPAGE is enabled, khugepaged will try to collapse read-only file-backed pages to THP. But the mapping does not actually support multi order large folios properly.

Using /sys/kernel/debug/split_huge_pages to verify this, with this patch, large anon THP is successfully split and the warning is ceased.

Link: https://lkml.kernel.org/r/202406071740485174hcFl7jRxncsHDtI-Pz-o@zte.com.cn Fixes: c010d47f107f ("mm: thp: split huge page to any lower order pages") Reviewed-by: Barry Song baohua@kernel.org Reviewed-by: Zi Yan ziy@nvidia.com Acked-by: David Hildenbrand david@redhat.com Signed-off-by: Ran Xiaokai ran.xiaokai@zte.com.cn Cc: Michal Hocko mhocko@kernel.org Cc: xu xin xu.xin16@zte.com.cn Cc: Yang Yang yang.yang29@zte.com.cn Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

include/linux/pagemap.h | 4 ++++ mm/huge_memory.c | 28 +++++++++++++++++----------- 2 files changed, 21 insertions(+), 11 deletions(-)

--- a/include/linux/pagemap.h~mm-huge_memory-fix-misused-mapping_large_folio_support-for-anon-folios +++ a/include/linux/pagemap.h @@ -368,6 +368,10 @@ static inline void mapping_set_large_fol */ static inline bool mapping_large_folio_support(struct address_space *mapping) { + /* AS_LARGE_FOLIO_SUPPORT is only reasonable for pagecache folios */ + VM_WARN_ONCE((unsigned long)mapping & PAGE_MAPPING_ANON, + "Anonymous mapping always supports large folio"); + return IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && test_bit(AS_LARGE_FOLIO_SUPPORT, &mapping->flags); } --- a/mm/huge_memory.c~mm-huge_memory-fix-misused-mapping_large_folio_support-for-anon-folios +++ a/mm/huge_memory.c @@ -3009,30 +3009,36 @@ int split_huge_page_to_list_to_order(str if (new_order >= folio_order(folio)) return -EINVAL;

- /* Cannot split anonymous THP to order-1 */ - if (new_order == 1 && folio_test_anon(folio)) { - VM_WARN_ONCE(1, "Cannot split to order-1 folio"); - return -EINVAL; - } - - if (new_order) { - /* Only swapping a whole PMD-mapped folio is supported */ - if (folio_test_swapcache(folio)) + if (folio_test_anon(folio)) { + /* order-1 is not supported for anonymous THP. */ + if (new_order == 1) { + VM_WARN_ONCE(1, "Cannot split to order-1 folio"); return -EINVAL; + } + } else if (new_order) { /* Split shmem folio to non-zero order not supported */ if (shmem_mapping(folio->mapping)) { VM_WARN_ONCE(1, "Cannot split shmem folio to non-0 order"); return -EINVAL; } - /* No split if the file system does not support large folio */ - if (!mapping_large_folio_support(folio->mapping)) { + /* + * No split if the file system does not support large folio. + * Note that we might still have THPs in such mappings due to + * CONFIG_READ_ONLY_THP_FOR_FS. But in that case, the mapping + * does not actually support large folios properly. + */ + if (IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS) && + !mapping_large_folio_support(folio->mapping)) { VM_WARN_ONCE(1, "Cannot split file folio to non-0 order"); return -EINVAL; } }

+ /* Only swapping a whole PMD-mapped folio is supported */ + if (folio_test_swapcache(folio) && new_order) + return -EINVAL;

is_hzp = is_huge_zero_folio(folio); if (is_hzp) { _

Patches currently in -mm which might be from ran.xiaokai@zte.com.cn are

mm-huge_memory-fix-misused-mapping_large_folio_support-for-anon-folios.patch mm-huge_memory-mark-racy-access-onhuge_anon_orders_always.patch