There are mainly two reasons that thp_get_unmapped_area() should be used for EROFS as other filesystems:
- It's needed to enable PMD mappings as a FSDAX filesystem, see commit 74d2fad1334d ("thp, dax: add thp_get_unmapped_area for pmd mappings"); - It's useful together with CONFIG_READ_ONLY_THP_FOR_FS which enables THPs for read-only mmapped files (e.g. shared libraries) even without FSDAX. See commit 1854bc6e2420 ("mm/readahead: Align file mappings for non-DAX"). Fixes: 06252e9ce05b ("erofs: dax support for non-tailpacking regular file") Signed-off-by: Gao Xiang <hsiang...@linux.alibaba.com> --- fs/erofs/data.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/erofs/data.c b/fs/erofs/data.c index c98aeda8abb2..3d9721b3faa8 100644 --- a/fs/erofs/data.c +++ b/fs/erofs/data.c @@ -447,5 +447,6 @@ const struct file_operations erofs_file_fops = { .llseek = generic_file_llseek, .read_iter = erofs_file_read_iter, .mmap = erofs_file_mmap, + .get_unmapped_area = thp_get_unmapped_area, .splice_read = filemap_splice_read, }; -- 2.39.3