From: Baolin Wang baolin.wang@linux.alibaba.com
mainline inclusion from mainline-v6.11-rc2 commit b66b1b71d7ff5464d23a0ac6f73fae461b7264fd category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IAIHPC
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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Similar to commit d659b715e94ac ("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... [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.172240407... Fixes: e7a2ab7b3bb5 ("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 Signed-off-by: Liu Shixin liushixin2@huawei.com --- mm/shmem.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-)
diff --git a/mm/shmem.c b/mm/shmem.c index 691f8efc438c..f579367c5968 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -1646,11 +1646,6 @@ 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;
@@ -1695,7 +1690,7 @@ 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,