qiurui
/
linux-kernelorg-stable
mirror of https://kernel.googlesource.com/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity
linux-kernelorg-stable/include
History
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
..
acpi
…
asm-generic kbuild: align modinfo section for Secureboot Authenticode EDK2 compat 2025-10-27 16:21:24 -07:00
clocksource
…
crypto
…
cxl
…
drm kbuild: Let kernel-doc.py use PYTHON3 override 2025-11-08 19:42:22 -07:00
dt-bindings
…
hyperv
…
keys
…
kunit
…
kvm KVM: arm64: Kill leftovers of ad-hoc timer userspace access 2025-10-13 14:42:41 +01:00
linux mm/huge_memory: do not change split_huge_page*() target order silently 2025-11-09 21:19:41 -08:00
math-emu
…
media
…
memory
…
misc
…
net hardening fixes for v6.18-rc5 2025-11-06 11:54:59 -08:00
pcmcia
…
ras
…
rdma
…
rv
…
scsi scsi: core: Fix the unit attention counter implementation 2025-10-21 21:09:36 -04:00
soc
…
sound
…
target
…
trace trace: tcp: add three metrics to trace_tcp_rcvbuf_grow() 2025-10-29 17:30:18 -07:00
uapi drm fixes for 6.18-rc5 2025-11-07 14:51:11 -08:00
ufs scsi: ufs: core: Add a quirk to suppress link_startup_again 2025-10-29 23:20:19 -04:00
vdso
…
video
…
xen
…
Kbuild
…