Re: [PATCH 2/3] bpf: arena: use page_ref_count() instead of page_mapped() in arena_free_pages()

Alexei Starovoitov
2026-04-27T15:27:29Z

On Mon, Apr 27, 2026 at 4:15 PM Andrew Morton <akpm@linux-foundation.org> wrote:
>
> On Mon, 27 Apr 2026 16:00:59 +0100 Alexei Starovoitov <alexei.starovoitov@gmail.com> wrote:
>
> > > >
> > > > Signed-off-by: David Hildenbrand (Arm) <david@kernel.org>
> > > > ---
> > > > kernel/bpf/arena.c | 2 +-
> > >
> > > BPF maintainers will probably want to carry this in the BPF tree.
> > > That's fine - please go ahead and add it. I'll carry a duplicate in
> > > mm.git so it compiles.
> >
> > We cannot carry the same patch in 2 trees.
>
> Git is fine with that.
>
> > Sooner or later it will create problems for linux-next
> > and issues during merge window if more changes
> > are done in the same area.
> > The only way to share a patch between trees is to
> > create a stable branch and pull it into 2 trees
> > then sha will be the same,
>
> For a single one-line patch?

Number of changed lines is irrelevant.
If there will be a commit on top that moves this line
or lines within the hunk, git will be confused depending
on order of pulls.
We learned this lesson the hard way.