The following commit has been merged into the core/rcu branch of tip: Commit-ID: b70fa3b12fc8d2b870d1ac7fd44da89271eb8705 Gitweb: https://git.kernel.org/tip/b70fa3b12fc8d2b870d1ac7fd44da89271eb8705 Author: Paul E. McKenney <paulmck@xxxxxxxxxx> AuthorDate: Tue, 08 Dec 2020 15:26:22 -08:00 Committer: Paul E. McKenney <paulmck@xxxxxxxxxx> CommitterDate: Fri, 22 Jan 2021 15:23:57 -08:00 mm: Make mem_dump_obj() handle NULL and zero-sized pointers This commit makes mem_dump_obj() call out NULL and zero-sized pointers specially instead of classifying them as non-paged memory. Cc: Christoph Lameter <cl@xxxxxxxxx> Cc: Pekka Enberg <penberg@xxxxxxxxxx> Cc: David Rientjes <rientjes@xxxxxxxxxx> Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Cc: <linux-mm@xxxxxxxxx> Reported-by: Andrii Nakryiko <andrii@xxxxxxxxxx> Acked-by: Vlastimil Babka <vbabka@xxxxxxx> Tested-by: Naresh Kamboju <naresh.kamboju@xxxxxxxxxx> Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx> --- mm/util.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/mm/util.c b/mm/util.c index da46f9d..92f23d2 100644 --- a/mm/util.c +++ b/mm/util.c @@ -997,7 +997,12 @@ int __weak memcmp_pages(struct page *page1, struct page *page2) void mem_dump_obj(void *object) { if (!virt_addr_valid(object)) { - pr_cont(" non-paged (local) memory.\n"); + if (object == NULL) + pr_cont(" NULL pointer.\n"); + else if (object == ZERO_SIZE_PTR) + pr_cont(" zero-size pointer.\n"); + else + pr_cont(" non-paged (local) memory.\n"); return; } if (kmem_valid_obj(object)) {
