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Subject[PATCH v2] rcu: Handle failure of memory allocation functions
Date
Add warning when these functions (eg:kmalloc,vmalloc) fail, handle the
failure.

Signed-off-by: Li Qiong <liqiong@nfschina.com>
---
v2:
- check return value of kmem_cache_create().
---
kernel/rcu/rcutorture.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 7120165a9342..104d2658a366 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -1990,7 +1990,13 @@ static void rcu_torture_mem_dump_obj(void)
static int z;

kcp = kmem_cache_create("rcuscale", 136, 8, SLAB_STORE_USER, NULL);
+ if (WARN_ON_ONCE(!kcp))
+ return;
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 +2013,8 @@ 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 +2022,8 @@ 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);
--
2.25.1
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