From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com> mainline inclusion from mainline-v5.14-rc4 commit b5916c025432b7c776b6bb13617485fbc0bd3ebd category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IAFONL CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- Similar to commit 2da9f6305f30 ("mm/vmscan: fix NR_ISOLATED_FILE corruption on 64-bit") avoid using unsigned int for nr_pages. With unsigned int type the large unsigned int converts to a large positive signed long. Symptoms include CMA allocations hanging forever due to alloc_contig_range->...->isolate_migratepages_block waiting forever in "while (unlikely(too_many_isolated(pgdat)))". Link: https://lkml.kernel.org/r/20210728042531.359409-1-aneesh.kumar@linux.ibm.com Fixes: c5fc5c3ae0c8 ("mm: migrate: account THP NUMA migration counters correctly") Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Reported-by: Michael Ellerman <mpe@ellerman.id.au> Reported-by: Alexey Kardashevskiy <aik@ozlabs.ru> Reviewed-by: Yang Shi <shy828301@gmail.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: David Hildenbrand <david@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Nanyong Sun <sunnanyong@huawei.com> --- mm/migrate.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/migrate.c b/mm/migrate.c index 99a04ac960b3..ce7b7989286b 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2154,7 +2154,7 @@ int migrate_misplaced_page(struct page *page, struct vm_area_struct *vma, LIST_HEAD(migratepages); new_page_t *new; bool compound; - unsigned int nr_pages = thp_nr_pages(page); + int nr_pages = thp_nr_pages(page); /* * PTE mapped THP or HugeTLB page can't reach here so the page could -- 2.25.1