Messages in this thread Patch in this message | | | From | paulmck@kernel ... | Subject | [PATCH mm,percpu_ref,rcu 2/6] mm: Make mem_dump_obj() handle NULL and zero-sized pointers | Date | Tue, 5 Jan 2021 17:17:46 -0800 |
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From: "Paul E. McKenney" <paulmck@kernel.org>
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> 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)) { -- 2.9.5
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