On Wed, 3 Jun 2026 at 14:36, Linus Torvalds
[off-list ref] wrote:

It was just the filesystem side that basically now instead of exposing
the page cache directly (with filemap_splice_read) now only exposed a
*copy* of the page cache (with copy_splice_read).

... and let me note that UNTESTED part again.

The patch looked "ObviouslyCorrect(tm)" to me, and I did actually
compile-test it too.

So it probably wasn't _complete_ crap.

But I never even booted it, and if I had, I wouldn't have had any
loads that uses splice (or sendfile) anyway.

So caveat emptor.

              Linus