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author | Muchun Song <songmuchun@bytedance.com> | 2022-04-29 09:16:09 +0300 |
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committer | akpm <akpm@linux-foundation.org> | 2022-04-29 09:16:09 +0300 |
commit | e583b5c472bd23d450e06f148dc1f37be74f7666 (patch) | |
tree | 055e2f40774113d9fb46b0eef7fdc9bda29702fe /arch/powerpc | |
parent | 7f9c9b607dc2641c77266efe788fab853d27dbd1 (diff) | |
download | linux-e583b5c472bd23d450e06f148dc1f37be74f7666.tar.xz |
dax: fix cache flush on PMD-mapped pages
The flush_cache_page() only remove a PAGE_SIZE sized range from the cache.
However, it does not cover the full pages in a THP except a head page.
Replace it with flush_cache_range() to fix this issue. This is just a
documentation issue with the respect to properly documenting the expected
usage of cache flushing before modifying the pmd. However, in practice
this is not a problem due to the fact that DAX is not available on
architectures with virtually indexed caches per:
commit d92576f1167c ("dax: does not work correctly with virtual aliasing caches")
Link: https://lkml.kernel.org/r/20220403053957.10770-3-songmuchun@bytedance.com
Fixes: f729c8c9b24f ("dax: wrprotect pmd_t in dax_mapping_entry_mkclean")
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jan Kara <jack@suse.cz>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: Ross Zwisler <zwisler@kernel.org>
Cc: Xiongchun Duan <duanxiongchun@bytedance.com>
Cc: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Cc: Yang Shi <shy828301@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'arch/powerpc')
0 files changed, 0 insertions, 0 deletions