mm: page-isolation: skip isolated pageblock in start_isolate_page_range()

start_isolate_page_range() first isolates the first and the last
pageblocks in the range and ensure pages across range boundaries are split
during isolation.  But it missed the case when the range is <= a pageblock
and the first and the last pageblocks are the same one, so the second
isolate_single_pageblock() will always fail.  To fix it, skip the
pageblock isolation in second isolate_single_pageblock().

Link: https://lkml.kernel.org/r/[email protected]
Fixes: 88ee134320b8 ("mm: fix a potential infinite loop in start_isolate_page_range()")
Signed-off-by: Zi Yan <[email protected]>
Reported-by: Marek Szyprowski <[email protected]>
Tested-by: Marek Szyprowski <[email protected]>
  Link: https://lore.kernel.org/linux-mm/[email protected]/
Reported-by: Michael Walle <[email protected]>
Tested-by: Michael Walle <[email protected]>
  Link: https://lore.kernel.org/linux-mm/[email protected]/
Cc: Christophe Leroy <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: Doug Berger <[email protected]>
Cc: Eric Ren <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Mike Rapoport <[email protected]>
Cc: Oscar Salvador <[email protected]>
Cc: Qian Cai <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions