kmemleak: Add kmemleak_alloc callback from alloc_large_system_hash

The alloc_large_system_hash function is called from various places in
the kernel and it contains pointers to other allocated structures. It
therefore needs to be traced by kmemleak.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 474c7e9dd51a..17d5f539a9aa 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -46,6 +46,7 @@
 #include <linux/page-isolation.h>
 #include <linux/page_cgroup.h>
 #include <linux/debugobjects.h>
+#include <linux/kmemleak.h>
 
 #include <asm/tlbflush.h>
 #include <asm/div64.h>
@@ -4546,6 +4547,16 @@ void *__init alloc_large_system_hash(const char *tablename,
         if (_hash_mask)
                 *_hash_mask = (1 << log2qty) - 1;
 
+        /*
+         * If hashdist is set, the table allocation is done with __vmalloc()
+         * which invokes the kmemleak_alloc() callback. This function may also
+         * be called before the slab and kmemleak are initialised when
+         * kmemleak simply buffers the request to be executed later
+         * (GFP_ATOMIC flag ignored in this case).
+         */
+        if (!hashdist)
+                kmemleak_alloc(table, size, 1, GFP_ATOMIC);
+
         return table;
 }