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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>
This commit is contained in:
Paul E. McKenney 2020-12-08 15:26:22 -08:00
parent 8e7f37f2aa
commit b70fa3b12f
1 changed files with 6 additions and 1 deletions
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7
mm/util.c
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@ -997,7 +997,12 @@ int __weak memcmp_pages(struct page *page1, struct page *page2)
void mem_dump_obj(void *object) void mem_dump_obj(void *object)
{ {
if (!virt_addr_valid(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; return;
} }
if (kmem_valid_obj(object)) { if (kmem_valid_obj(object)) {