[tip: core/rcu] mm: Make mem_dump_obj() handle NULL and zero-sized pointers
From: tip-bot2 for Paul E. McKenney <hidden>
Date: 2021-02-12 12:38:30
Also in:
lkml
Subsystem:
memory management, memory management - core, the rest · Maintainers:
Andrew Morton, David Hildenbrand, Linus Torvalds
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 [off-list ref] AuthorDate: Tue, 08 Dec 2020 15:26:22 -08:00 Committer: Paul E. McKenney [off-list ref] 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 <redacted> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <redacted> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: <redacted> Reported-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Vlastimil Babka <redacted> Tested-by: Naresh Kamboju <redacted> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> --- 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)) {