On Sat, Jun 11, 2022 at 05:30:55PM +0800, Li Qiong wrote:
> Add warning when these functions (eg:kmalloc,vmalloc) fail, handle the
> failure.
>
> Signed-off-by: Li Qiong <liqiong@xxxxxxxxxxxx>
Good catch, thank you! However...
> ---
> kernel/rcu/rcutorture.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
> index 7120165a9342..97f90e304ae3 100644
> --- a/kernel/rcu/rcutorture.c
> +++ b/kernel/rcu/rcutorture.c
> @@ -1991,6 +1991,10 @@ static void rcu_torture_mem_dump_obj(void)
>
> kcp = kmem_cache_create("rcuscale", 136, 8, SLAB_STORE_USER, NULL);
As long as we are checking, why not also check this one?
Thanx, Paul
> rhp = kmem_cache_alloc(kcp, GFP_KERNEL);
> + if (WARN_ON_ONCE(!rhp)) {
> + kmem_cache_destroy(kcp);
> + return;
> + }
> 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);
> @@ -2007,6 +2011,8 @@ static void rcu_torture_mem_dump_obj(void)
> kmem_cache_free(kcp, rhp);
> kmem_cache_destroy(kcp);
> rhp = kmalloc(sizeof(*rhp), GFP_KERNEL);
> + if (WARN_ON_ONCE(!rhp))
> + return;
> 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);
> @@ -2014,6 +2020,8 @@ static void rcu_torture_mem_dump_obj(void)
> mem_dump_obj(&rhp->func);
> kfree(rhp);
> rhp = vmalloc(4096);
> + if (WARN_ON_ONCE(!rhp))
> + return;
> 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);
> --
> 2.11.0
>
