On Tue, 2 Jun 2026 at 15:54, Askar Safin [off-list ref] wrote:

Pedro is talking here not about this vmsplice patch, but about
my future hypothetical patch, which will remove splice-pagecache-to-pipe.

That absolutely would be my suggested next step.

Something like the attached - get rid of filemap_splice_read()
entirely, and just replace it with copy_splice_read().

That also make the whole O_DIRECT and DAX special case just simply go away.

This is - in case there was any question about it - ENTIRELY untested.

It may not compile.

And if it does compile, it may do unspeakable things to your pets.

So think of this as nothing more than a "something like this". It does
leave "splice_read" around, and it intentionally just does that

   #define filemap_splice_read copy_splice_read

to not have to modify all the existing users one by one.

It would be interesting to hear if there are any actual real loads
that would ever notice?

                Linus