UPSTREAM: mm: page_alloc: fix move_freepages_block() range error

When a block is partially outside the zone of the cursor page, the
function cuts the range to the pivot page instead of the zone start.  This
can leave large parts of the block behind, which encourages incompatible
page mixing down the line (ask for one type, get another), and thus
long-term fragmentation.

This triggers reliably on the first block in the DMA zone, whose start_pfn
is 1.  The block is stolen, but everything before the pivot page (which
was often hundreds of pages) is left on the old list.

Link: https://lkml.kernel.org/r/20240320180429.678181-6-hannes@cmpxchg.org


Change-Id: I9b50ac32ec86ec579007f099059e8461f46ea50e
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Tested-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
(cherry picked from commit 2dd482ba)
Bug: 420771453
Bug: 421481159
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>