debugobjects: avoid recursive calls with kmemleak
authorQian Cai <cai@gmx.us>
Fri, 30 Nov 2018 22:09:48 +0000 (14:09 -0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Mon, 17 Dec 2018 08:28:54 +0000 (09:28 +0100)
commit225b11374625aa4827fc1ee0b810c27dfe851809
tree2ddc7c229384a0fe0ace525a60426c2720fd4660
parent95c8714e3fa0bee316600c46fd007fec2750206b
debugobjects: avoid recursive calls with kmemleak

[ Upstream commit 8de456cf87ba863e028c4dd01bae44255ce3d835 ]

CONFIG_DEBUG_OBJECTS_RCU_HEAD does not play well with kmemleak due to
recursive calls.

fill_pool
  kmemleak_ignore
    make_black_object
      put_object
        __call_rcu (kernel/rcu/tree.c)
          debug_rcu_head_queue
            debug_object_activate
              debug_object_init
                fill_pool
                  kmemleak_ignore
                    make_black_object
                      ...

So add SLAB_NOLEAKTRACE to kmem_cache_create() to not register newly
allocated debug objects at all.

Link: http://lkml.kernel.org/r/20181126165343.2339-1-cai@gmx.us
Signed-off-by: Qian Cai <cai@gmx.us>
Suggested-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Waiman Long <longman@redhat.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yang Shi <yang.shi@linux.alibaba.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
lib/debugobjects.c