Commit 0d3dd2c8 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

rcutorture: Add crude tests for mem_dump_obj() 



This commit adds a few crude tests for mem_dump_obj() to rcutorture
runs.  Just to prevent bitrot, you understand!

Signed-off-by: default avatarPaul E. McKenney <paulmck@kernel.org>
parent 5bb1bb35

kernel/rcu/rcutorture.c

+39 −0
Original line number Diff line number Diff line
@@ -1861,6 +1861,45 @@ rcu_torture_stats(void *arg) 
		torture_shutdown_absorb("rcu_torture_stats");

	} while (!torture_must_stop());

	torture_kthread_stopping("rcu_torture_stats");



	{

		struct rcu_head *rhp;

		struct kmem_cache *kcp;

		static int z;



		kcp = kmem_cache_create("rcuscale", 136, 8, SLAB_STORE_USER, NULL);

		rhp = kmem_cache_alloc(kcp, GFP_KERNEL);

		pr_alert("mem_dump_obj() slab test: rcu_torture_stats = %px, &rhp = %px, rhp = %px, &z = %px\n", stats_task, &rhp, rhp, &z);

		pr_alert("mem_dump_obj(ZERO_SIZE_PTR):");

		mem_dump_obj(ZERO_SIZE_PTR);

		pr_alert("mem_dump_obj(NULL):");

		mem_dump_obj(NULL);

		pr_alert("mem_dump_obj(%px):", &rhp);

		mem_dump_obj(&rhp);

		pr_alert("mem_dump_obj(%px):", rhp);

		mem_dump_obj(rhp);

		pr_alert("mem_dump_obj(%px):", &rhp->func);

		mem_dump_obj(&rhp->func);

		pr_alert("mem_dump_obj(%px):", &z);

		mem_dump_obj(&z);

		kmem_cache_free(kcp, rhp);

		kmem_cache_destroy(kcp);

		rhp = kmalloc(sizeof(*rhp), GFP_KERNEL);

		pr_alert("mem_dump_obj() kmalloc test: rcu_torture_stats = %px, &rhp = %px, rhp = %px\n", stats_task, &rhp, rhp);

		pr_alert("mem_dump_obj(kmalloc %px):", rhp);

		mem_dump_obj(rhp);

		pr_alert("mem_dump_obj(kmalloc %px):", &rhp->func);

		mem_dump_obj(&rhp->func);

		kfree(rhp);

		rhp = vmalloc(4096);

		pr_alert("mem_dump_obj() vmalloc test: rcu_torture_stats = %px, &rhp = %px, rhp = %px\n", stats_task, &rhp, rhp);

		pr_alert("mem_dump_obj(vmalloc %px):", rhp);

		mem_dump_obj(rhp);

		pr_alert("mem_dump_obj(vmalloc %px):", &rhp->func);

		mem_dump_obj(&rhp->func);

		vfree(rhp);

	}



	return 0;

}

mm/slab_common.c

+2 −0
Original line number Diff line number Diff line
@@ -545,6 +545,7 @@ bool kmem_valid_obj(void *object) 
	page = virt_to_head_page(object);

	return PageSlab(page);

}

EXPORT_SYMBOL_GPL(kmem_valid_obj);



/**

 * kmem_dump_obj - Print available slab provenance information
@@ -601,6 +602,7 @@ void kmem_dump_obj(void *object) 
		pr_info("    %pS\n", kp.kp_stack[i]);

	}

}

EXPORT_SYMBOL_GPL(kmem_dump_obj);

#endif



#ifndef CONFIG_SLOB

mm/util.c

+1 −0
Original line number Diff line number Diff line
@@ -1014,4 +1014,5 @@ void mem_dump_obj(void *object) 
	}

	pr_cont(" non-slab/vmalloc memory.\n");

}

EXPORT_SYMBOL_GPL(mem_dump_obj);

#endif