On Fri, May 05, 2023 at 06:42:02AM +0200, Andreas Hindborg wrote:

Matthew Wilcox [off-list ref] writes:

quoted

On Wed, May 03, 2023 at 11:06:59AM +0200, Andreas Hindborg wrote:

quoted

From: Andreas Hindborg <redacted>

This patch adds support for working with pages of order 0. Support for pages
with higher order is deferred. Page allocation flags are fixed in this patch.
Future work might allow the user to specify allocation flags.

This patch is a heavily modified version of code available in the rust tree [1],
primarily adding support for multiple page mapping strategies.

This also seems misaligned with the direction of Linux development.
Folios are the future, pages are legacy.  Please, ask about what's
going on before wasting time on the past.

I see, thanks for the heads up! In this case I wanted to do an
apples-apples comparison to the C null_blk driver. Since that is using
kmap I wanted to have that. But let's bind to the folio_* APIs in the
future, that would make sense.

Well, kmap() is essentially a no-op on 64-bit systems, so it's not
terribly relevant to doing a comparison.