If the last cycle reads bogus compound_order() and blockpfn > end_pfn occurs, it is possible that total_isolated will be less than nr_scanned. In this case, strict mode should return 0, but the “if (strict && blockpfn < end_pfn)” statement cannot recognize this situation Signed-off-by: Qiang Liu <liuq131@xxxxxxxxxxxxxxx> --- mm/compaction.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/compaction.c b/mm/compaction.c index a2b16b08cbbf..6009f5d1021a 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -699,7 +699,7 @@ static unsigned long isolate_freepages_block(struct compact_control *cc, * pages requested were isolated. If there were any failures, 0 is * returned and CMA will fail. */ - if (strict && blockpfn < end_pfn) + if (strict && (blockpfn < end_pfn || total_isolated != nr_scanned)) total_isolated = 0; cc->total_free_scanned += nr_scanned; -- 2.27.0
