mm/page_alloc: don't undo a racing start_isolate_page_range()

On 27 Oct 2026, at 11:46, Vlastimil Babka (SUSE) wrote: > From: Josef Bacik josef@toxicpanda.com > > start_isolate_page_range() fails with -EBUSY if one of the pageblocks is > already isolated, i.e.