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mm: shmem: avoid allocating huge pages larger than MAX_PAGECACHE_ORDER for shmem

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Similar to commit d659b715e9 ("mm/huge_memory: avoid PMD-size page
cache if needed"), ARM64 can support 512MB PMD-sized THP when the base
page size is 64KB, which is larger than the maximum supported page cache
size MAX_PAGECACHE_ORDER.

This is not expected.  To fix this issue, use THP_ORDERS_ALL_FILE_DEFAULT
for shmem to filter allowable huge orders.

[baolin.wang@linux.alibaba.com: remove comment, per Barry]
  Link: https://lkml.kernel.org/r/c55d7ef7-78aa-4ed6-b897-c3e03a3f3ab7@linux.alibaba.com
[wangkefeng.wang@huawei.com: remove local `orders']
  Link: https://lkml.kernel.org/r/87769ae8-b6c6-4454-925d-1864364af9c8@huawei.com
Link: https://lkml.kernel.org/r/117121665254442c3c7f585248296495e5e2b45c.1722404078.git.baolin.wang@linux.alibaba.com
Fixes: e7a2ab7b3b ("mm: shmem: add mTHP support for anonymous shmem")
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: Barry Song <baohua@kernel.org>
Cc: Barry Song <21cnbao@gmail.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Gavin Shan <gshan@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Lance Yang <ioworker0@gmail.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Baolin Wang 2024-07-31 13:46:19 +08:00 committed by Andrew Morton
parent 5161b48712
commit b66b1b71d7
1 changed files with 1 additions and 6 deletions
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7
mm/shmem.c
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@ -1629,11 +1629,6 @@ unsigned long shmem_allowable_huge_orders(struct inode *inode,
unsigned long mask = READ_ONCE(huge_shmem_orders_always);
unsigned long within_size_orders = READ_ONCE(huge_shmem_orders_within_size);
unsigned long vm_flags = vma->vm_flags;
/*
* Check all the (large) orders below HPAGE_PMD_ORDER + 1 that
* are enabled for this vma.
*/
unsigned long orders = BIT(PMD_ORDER + 1) - 1;
loff_t i_size;
int order;
@ -1678,7 +1673,7 @@ unsigned long shmem_allowable_huge_orders(struct inode *inode,
if (global_huge)
mask |= READ_ONCE(huge_shmem_orders_inherit);
return orders & mask;
return THP_ORDERS_ALL_FILE_DEFAULT & mask;
}
static unsigned long shmem_suitable_orders(struct inode *inode, struct vm_fault *vmf,