linux-kernel - [PATCH] rcu: Handle failure of memory allocation functions

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Date:   Sat, 11 Jun 2022 17:30:55 +0800
From:   Li Qiong <liqiong@...china.com>
To:     Davidlohr Bueso <dave@...olabs.net>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Josh Triplett <josh@...htriplett.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Neeraj Upadhyay <quic_neeraju@...cinc.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Joel Fernandes <joel@...lfernandes.org>
Cc:     linux-kernel@...r.kernel.org, rcu@...r.kernel.org,
        hukun@...china.com, qixu@...china.com, yuzhe@...china.com,
        renyu@...china.com, Li Qiong <liqiong@...china.com>
Subject: [PATCH] rcu: Handle failure of memory allocation functions

Add warning when these functions (eg:kmalloc,vmalloc) fail, handle the
failure.

Signed-off-by: Li Qiong <liqiong@...china.com>
---
 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);
 	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