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Zi Yan 77008e1b2e mm/huge_memory: do not change split_huge_page*() target order silently 
Page cache folios from a file system that support large block size (LBS)
can have minimal folio order greater than 0, thus a high order folio might
not be able to be split down to order-0.  Commit e220917fa5 ("mm: split
a folio in minimum folio order chunks") bumps the target order of
split_huge_page*() to the minimum allowed order when splitting a LBS
folio.  This causes confusion for some split_huge_page*() callers like
memory failure handling code, since they expect after-split folios all
have order-0 when split succeeds but in reality get min_order_for_split()
order folios and give warnings.

Fix it by failing a split if the folio cannot be split to the target
order.  Rename try_folio_split() to try_folio_split_to_order() to reflect
the added new_order parameter.  Remove its unused list parameter.

[The test poisons LBS folios, which cannot be split to order-0 folios, and
also tries to poison all memory.  The non split LBS folios take more
memory than the test anticipated, leading to OOM.  The patch fixed the
kernel warning and the test needs some change to avoid OOM.]

Link: https://lkml.kernel.org/r/20251017013630.139907-1-ziy@nvidia.com
Fixes: e220917fa5 ("mm: split a folio in minimum folio order chunks")
Signed-off-by: Zi Yan <ziy@nvidia.com>
Reported-by: syzbot+e6367ea2fdab6ed46056@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/all/68d2c943.a70a0220.1b52b.02b3.GAE@google.com/
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed-by: Pankaj Raghav <p.raghav@samsung.com>
Reviewed-by: Wei Yang <richard.weiyang@gmail.com>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Barry Song <baohua@kernel.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Jane Chu <jane.chu@oracle.com>
Cc: Lance Yang <lance.yang@linux.dev>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Mariano Pache <npache@redhat.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Naoya Horiguchi <nao.horiguchi@gmail.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 		2025-11-09 21:19:41 -08:00
..
damon mm/damon/core: use damos_commit_quota_goal() for new goal commit 2025-10-21 15:46:18 -07:00
kasan Summary of significant series in this pull request: 2025-10-02 18:18:33 -07:00
kfence kfence: drop nth_page() usage 2025-09-21 14:22:09 -07:00
kmsan dma-mapping fixes for Linux 6.18: 2025-10-07 12:48:06 -07:00
Kconfig Summary of significant series in this pull request: 2025-10-02 18:18:33 -07:00
Kconfig.debug mm: rename GENERIC_PTDUMP and PTDUMP_CORE 2025-03-17 00:05:32 -07:00
Makefile mm: remove unused zpool layer 2025-09-21 14:21:59 -07:00
backing-dev.c fuse update for 6.18 2025-10-03 12:48:18 -07:00
balloon_compaction.c mm/migrate: fix NULL movable_ops if CONFIG_ZSMALLOC=m 2025-08-19 16:35:57 -07:00
bootmem_info.c mm/sparse: allow for alternate vmemmap section init at boot 2025-03-16 22:06:27 -07:00
cma.c mm/cma: refuse handing out non-contiguous page ranges 2025-09-21 14:22:06 -07:00
cma.h mm: cma: set early_pfn and bitmap as a union in cma_memrange 2025-05-22 14:55:36 -07:00
cma_debug.c mm: cma: simplify cma_maxchunk_get() 2025-07-24 19:12:36 -07:00
cma_sysfs.c
…
compaction.c mm/compaction: fix low_pfn advance on isolating hugetlb 2025-09-28 11:51:29 -07:00
debug.c mm: convert core mm to mm_flags_*() accessors 2025-09-13 16:54:56 -07:00
debug_page_alloc.c mm/debug_page_alloc: improve error message for invalid guardpage minorder 2025-05-12 23:50:38 -07:00
debug_page_ref.c
…
debug_vm_pgtable.c mm/debug_vm_pgtable: clear page table entries at destroy_args() 2025-08-19 16:35:54 -07:00
dmapool.c docs: dma-api: replace consistent with coherent 2025-07-01 13:25:36 -06:00
dmapool_test.c
…
early_ioremap.c
…
execmem.c mm: remove PMD alignment constraint in execmem_vmalloc() 2025-09-28 11:51:31 -07:00
fadvise.c
…
fail_page_alloc.c
…
failslab.c
…
filemap.c NFS Client Updates for Linux 6.18 2025-10-03 14:20:40 -07:00
folio-compat.c
…
gup.c mm/gup: fix handling of errors from arch_make_folio_accessible() in follow_page_pte() 2025-09-21 14:22:29 -07:00
gup_test.c
…
gup_test.h
…
highmem.c mm: constify highmem related functions for improved const-correctness 2025-09-21 14:22:15 -07:00
hmm.c dma-mapping updates for Linux 6.18: 2025-10-03 17:41:12 -07:00
huge_memory.c mm/huge_memory: do not change split_huge_page*() target order silently 2025-11-09 21:19:41 -08:00
hugetlb.c hugetlbfs: move lock assertions after early returns in huge_pmd_unshare() 2025-10-21 15:46:17 -07:00
hugetlb_cgroup.c page_counter: track failcnt only for legacy cgroups 2025-03-17 00:05:35 -07:00
hugetlb_cma.c mm: hugetlb: directly pass order when allocate a hugetlb folio 2025-09-21 14:22:11 -07:00
hugetlb_cma.h mm: hugetlb: directly pass order when allocate a hugetlb folio 2025-09-21 14:22:11 -07:00
hugetlb_vmemmap.c mm/pagewalk: split walk_page_range_novma() into kernel/user parts 2025-07-09 22:42:05 -07:00
hugetlb_vmemmap.h mm/hugetlb: do pre-HVO for bootmem allocated pages 2025-03-16 22:06:29 -07:00
hwpoison-inject.c mm/hwpoison: decouple hwpoison_filter from mm/memory-failure.c 2025-09-21 14:22:21 -07:00
init-mm.c
…
internal.h Summary of significant series in this pull request: 2025-10-02 18:18:33 -07:00
interval_tree.c
…
ioremap.c
…
khugepaged.c mm/khugepaged: use KMEM_CACHE() 2025-10-03 16:42:44 -07:00
kmemleak.c mm: fix possible deadlock in kmemleak 2025-09-01 17:11:37 -07:00
ksm.c mm/ksm: cleanup mm_slot_entry() invocation 2025-10-03 16:42:44 -07:00
list_lru.c mm, list_lru: refactor the locking code 2025-07-09 22:41:56 -07:00
maccess.c mm: unexport globally copy_to_kernel_nofault 2025-07-09 22:42:22 -07:00
madvise.c mm: clean up is_guard_pte_marker() 2025-10-03 16:42:43 -07:00
mapping_dirty_helpers.c mm: remove redundant pXd_devmap calls 2025-07-09 22:42:17 -07:00
memblock.c kho: replace kho_preserve_phys() with kho_preserve_pages() 2025-10-07 13:48:55 -07:00
memcontrol-v1.c mm/memcg: v1: account event registrations and drop world-writable cgroup.event_control 2025-09-21 14:22:26 -07:00
memcontrol-v1.h memcg: move do_memsw_account() to CONFIG_MEMCG_V1 2025-03-21 22:03:11 -07:00
memcontrol.c memcg: skip cgroup_file_notify if spinning is not allowed 2025-10-07 14:01:11 -07:00
memfd.c mm/memfd: remove redundant casts 2025-09-21 14:22:00 -07:00
memory-failure.c mm, swap: cleanup swap cache API and add kerneldoc 2025-09-21 14:22:23 -07:00
memory-tiers.c mm: re-enable kswapd when memory pressure subsides or demotion is toggled 2025-09-21 14:22:29 -07:00
memory.c mm/fault: try to map the entire file folio in finish_fault() 2025-09-28 11:51:30 -07:00
memory_hotplug.c mm/memory_hotplug: activate node before adding new memory blocks 2025-10-03 16:42:43 -07:00
mempolicy.c mm: split folio_pte_batch() into folio_pte_batch() and folio_pte_batch_flags() 2025-07-19 18:59:45 -07:00
mempool.c mm: mempool: fix crash in mempool_free() for zero-minimum pools 2025-08-02 12:06:13 -07:00
memremap.c mm/memremap: remove unused get_dev_pagemap() parameter 2025-09-21 14:22:21 -07:00
memtest.c
…
migrate.c mm: prevent poison consumption when splitting THP 2025-10-15 13:24:34 -07:00
migrate_device.c treewide: remove MIGRATEPAGE_SUCCESS 2025-09-13 16:54:50 -07:00
mincore.c mm, swap: use unified helper for swap cache look up 2025-09-21 14:22:22 -07:00
mlock.c mm: folio_may_be_lru_cached() unless folio_test_large() 2025-09-13 13:05:36 -07:00
mm_init.c mm/mm_init: simplify deferred initialization of struct pages 2025-10-04 11:03:10 -07:00
mm_slot.h
…
mmap.c mm: specify separate file and vm_file params in vm_area_desc 2025-09-22 20:17:11 -07:00
mmap_lock.c mm: change vma_start_read() to drop RCU lock on failure 2025-09-13 16:54:43 -07:00
mmu_gather.c mm: remove redundant __GFP_NOWARN 2025-09-13 16:54:58 -07:00
mmu_notifier.c Update Christoph's Email address and make it consistent 2025-05-12 23:50:31 -07:00
mmzone.c mm: introduce memdesc_flags_t 2025-09-13 16:55:07 -07:00
mprotect.c mm: pass page directly instead of using folio_page 2025-08-11 23:00:59 -07:00
mremap.c mm/mremap: correctly account old mapping after MREMAP_DONTUNMAP remap 2025-10-21 15:46:17 -07:00
mseal.c mm/mseal: rework mseal apply logic 2025-08-02 12:06:09 -07:00
msync.c
…
nommu.c mm/nommu: convert kobjsize() to folios 2025-09-13 16:54:46 -07:00
numa.c mm/numa: remove unnecessary local variable in alloc_node_data() 2025-05-12 23:50:38 -07:00
numa_emulation.c mm: numa,memblock: Use SZ_1M macro to denote bytes to MB conversion 2025-08-20 16:31:23 +03:00
numa_memblks.c mm: numa,memblock: Use SZ_1M macro to denote bytes to MB conversion 2025-08-20 16:31:23 +03:00
oom_kill.c mm/oom_kill.c: fix inverted check 2025-09-23 14:14:16 -07:00
page-writeback.c fuse update for 6.18 2025-10-03 12:48:18 -07:00
page_alloc.c Summary of significant series in this pull request: 2025-10-02 18:18:33 -07:00
page_counter.c page_counter: track failcnt only for legacy cgroups 2025-03-17 00:05:35 -07:00
page_ext.c mm,page_ext: derive the node from the pfn 2025-07-13 16:38:16 -07:00
page_frag_cache.c
…
page_idle.c sysfs: treewide: switch back to attribute_group::bin_attrs 2025-06-17 10:44:15 +02:00
page_io.c mm, swap: tidy up swap device and cluster info helpers 2025-09-21 14:22:23 -07:00
page_isolation.c mm/page_isolation: drop __folio_test_movable() check for large folios 2025-07-13 16:38:29 -07:00
page_owner.c mm: don't spin in add_stack_record when gfp flags don't allow 2025-10-15 13:24:33 -07:00
page_poison.c
…
page_reporting.c
…
page_reporting.h
…
page_table_check.c mm/page_table_check: Batch-check pmds/puds just like ptes 2025-05-09 13:43:07 +01:00
page_vma_mapped.c mm/page_vma_mapped: track if the page is mapped across page table boundary 2025-09-28 11:51:29 -07:00
pagewalk.c Summary of significant series in this pull request: 2025-10-02 18:18:33 -07:00
percpu-internal.h
…
percpu-km.c mm/mm/percpu-km: drop nth_page() usage within single allocation 2025-09-21 14:22:04 -07:00
percpu-stats.c mm: remove outdated filename comment in percpu-stats.c 2025-07-13 16:38:23 -07:00
percpu-vm.c
…
percpu.c percpu: fix race on alloc failed warning limit 2025-09-08 23:45:10 -07:00
pgalloc-track.h
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pgtable-generic.c mm: remove redundant pXd_devmap calls 2025-07-09 22:42:17 -07:00
process_vm_access.c
…
pt_reclaim.c
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ptdump.c mm/ptdump: take the memory hotplug lock inside ptdump_walk_pgd() 2025-07-09 22:42:20 -07:00
readahead.c readahead: add trace points 2025-09-21 14:22:28 -07:00
rmap.c mm/rmap: improve mlock tracking for large folios 2025-09-28 11:51:31 -07:00
rodata_test.c
…
secretmem.c Summary of significant series in this pull request: 2025-07-31 14:57:54 -07:00
shmem.c Summary of significant series in this pull request: 2025-10-02 18:18:33 -07:00
shmem_quota.c
…
show_mem.c mm: re-enable kswapd when memory pressure subsides or demotion is toggled 2025-09-21 14:22:29 -07:00
shrinker.c
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shrinker_debug.c mm/shrinker: fix name consistency issue in shrinker_debugfs_rename() 2025-03-17 00:05:40 -07:00
shuffle.c
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shuffle.h
…
slab.h Summary of significant series in this pull request: 2025-10-02 18:18:33 -07:00
slab_common.c slab: Introduce kmalloc_nolock() and kfree_nolock(). 2025-09-29 09:42:36 +02:00
slub.c slab: prevent infinite loop in kmalloc_nolock() with debugging 2025-11-06 08:13:12 +01:00
sparse-vmemmap.c mm: introduce and use {pgd,p4d}_populate_kernel() 2025-08-27 22:45:44 -07:00
sparse.c mm: introduce memdesc_nid() 2025-09-13 16:55:07 -07:00
swap.c mm: lru_add_drain_all() do local lru_add_drain() first 2025-09-21 14:22:32 -07:00
swap.h mm, swap: implement dynamic allocation of swap table 2025-09-21 14:22:25 -07:00
swap_cgroup.c mm: swap_cgroup: remove double initialization of locals 2025-03-17 22:06:58 -07:00
swap_state.c mm, swap: implement dynamic allocation of swap table 2025-09-21 14:22:25 -07:00
swap_table.h mm, swap: use a single page for swap table when the size fits 2025-09-21 14:22:25 -07:00
swapfile.c mm: swap: check for stable address space before operating on the VMA 2025-09-28 11:51:34 -07:00
truncate.c mm/huge_memory: do not change split_huge_page*() target order silently 2025-11-09 21:19:41 -08:00
usercopy.c
…
userfaultfd.c mm, swap: use unified helper for swap cache look up 2025-09-21 14:22:22 -07:00
util.c fsnotify: pass correct offset to fsnotify_mmap_perm() 2025-10-07 14:01:12 -07:00
vma.c mm: specify separate file and vm_file params in vm_area_desc 2025-09-22 20:17:11 -07:00
vma.h mm: specify separate file and vm_file params in vm_area_desc 2025-09-22 20:17:11 -07:00
vma_exec.c mm/vma: use vmg->target to specify target VMA for new VMA merge 2025-07-09 22:42:11 -07:00
vma_init.c Summary of significant series in this pull request: 2025-10-02 18:18:33 -07:00
vma_internal.h
…
vmalloc.c mm/vmalloc: move resched point into alloc_vmap_area() 2025-09-23 14:14:16 -07:00
vmpressure.c memcg: convert memcg->socket_pressure to u64 2025-07-24 19:12:32 -07:00
vmscan.c mm: re-enable kswapd when memory pressure subsides or demotion is toggled 2025-09-21 14:22:29 -07:00
vmstat.c mm: re-enable kswapd when memory pressure subsides or demotion is toggled 2025-09-21 14:22:29 -07:00
workingset.c mm: introduce memdesc_flags_t 2025-09-13 16:55:07 -07:00
zpdesc.h mm: zpdesc: minor naming and comment corrections 2025-09-21 14:21:59 -07:00
zsmalloc.c mm: remove unused zpool layer 2025-09-21 14:21:59 -07:00
zswap.c mm, swap: remove contention workaround for swap cache 2025-09-21 14:22:25 -07:00