Re: [PATCH v9 10/17] ntfs: update attrib operations

[Matthew Wilcox]

On Fri, Feb 13, 2026 at 05:17:57PM +0900, Namjae Jeon wrote:
> @@ -215,7 +232,7 @@ static int ntfs_decompress(struct page *dest_pages[], int completed_pages[],
>  				handle_bounds_compressed_page(dp, i_size,
>  						initialized_size);
>  				flush_dcache_page(dp);
> -				kunmap(dp);
> +				kunmap_local(page_address(dp));

This doesn't work.  kmap() makes page_address() work, but kmap_local()
doesn't.  kmap_local() returns a local mapping of the page, and you have
to kunmap_local() _that_ address.  page_address() will continue to
return NULL for highmem pages.

I'll send a patch soon for ntfs_decompress(), but thought I'd flag this
in case there are other places that need to be audited.