Re: [PATCH bpf-next] bpf: Replace scratch PTE atomically when allocating arena pages

On Mon, Jun 01, 2026 at 08:15:34PM +0000, bot+bpf-ci@kernel.org wrote:

After the real page is installed without a flush, can that stale
kaddr -> scratch_page translation persist, so that later kernel-side
accesses at kaddr reach the shared per-arena scratch page instead of
the freshly allocated page?

It can on x86, but it's harmless: that CPU faulted on an unallocated
address and got scratch-recovered, so reaching either the scratch or the
real page is fine. No flush needed.

Thanks.

--
tejun