On Fri, Mar 18, 2022 at 03:45:25PM +0800, Muchun Song wrote:
> 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")
> Fixes: f729c8c9b24f ("dax: wrprotect pmd_t in dax_mapping_entry_mkclean")
> Signed-off-by: Muchun Song <songmuc...@bytedance.com>
> Reviewed-by: Dan Williams <dan.j.willi...@intel.com>

Looks good:

Reviewed-by: Christoph Hellwig <h...@lst.de>

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