On Wed, Oct 13, 2021 at 12:00:34PM -0400, Kent Overstreet wrote:

As part of the struct page cleanups underway, we want to remove as much
usage of page->mapping and page->index as possible, as frequently they
are known from context.

In the brd code, we're never actually reading from page->index except in
assertions, so references to it can be safely deleted.

Signed-off-by: Kent Overstreet <redacted>

More than that ... this is essentially asserting that the radix tree
code works, and we have a test suite to ensure that.

Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>