From: Zhen Lei <thunder.leizhen@xxxxxxxxxx> v2 --> v3: 1. I made statistics about the source of 'rhp'. kmem_valid_obj() accounts for more than 97.5%, and vmalloc accounts for less than 1%. So change call mem_dump_obj() to call kmem_dump_obj() can meet debugging requirements and avoid the potential deadlock risk of vmalloc_dump_obj(). - mem_dump_obj(rhp); + if (kmem_valid_obj(rhp)) + kmem_dump_obj(rhp); The discussion about vmap_area_lock deadlock in v2: https://lkml.org/lkml/2022/11/11/493 2. Provide static inline empty functions for kmem_valid_obj() and kmem_dump_obj() when CONFIG_PRINTK=n. v1 --> v2: 1. Remove condition "(unsigned long)rhp->func & 0x3", it have problems on x86. 2. Paul E. McKenney helped me update the commit message, thanks. Zhen Lei (2): mm: Provide empty function for kmem_dump_obj() when CONFIG_PRINTK=n rcu: Dump memory object info if callback function is invalid include/linux/slab.h | 3 +++ kernel/rcu/rcu.h | 9 +++++++++ kernel/rcu/srcutiny.c | 1 + kernel/rcu/srcutree.c | 1 + kernel/rcu/tasks.h | 1 + kernel/rcu/tiny.c | 1 + kernel/rcu/tree.c | 1 + 7 files changed, 17 insertions(+) -- 2.34.1
