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| author |   Paul E. McKenney <paulmck@kernel.org> | 2020-12-08 15:26:22 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2021-01-22 15:23:57 -0800 |
| commit | b70fa3b12fc8d2b870d1ac7fd44da89271eb8705 (patch) | |
| tree | f68cacbddfff2a6cc7d48b02f1fb06b4576b70db /mm/util.c | |
| parent | mm: Add mem_dump_obj() to print source of memory block (diff) | |
| download | linux-dev-b70fa3b12fc8d2b870d1ac7fd44da89271eb8705.tar.xz linux-dev-b70fa3b12fc8d2b870d1ac7fd44da89271eb8705.zip | |
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@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: <linux-mm@kvack.org>
Reported-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'mm/util.c')
| -rw-r--r-- | mm/util.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/mm/util.c b/mm/util.c index da46f9d6c382..92f23d2c1277 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)) { |