[PATCH v3 bpf-next 02/13] bpf: Simplify code of destroy_mem_alloc() with kmemdup().

[Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx>]

From: Alexei Starovoitov <ast@xxxxxxxxxx>

Use kmemdup() to simplify the code.

Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx>
---
 kernel/bpf/memalloc.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/kernel/bpf/memalloc.c b/kernel/bpf/memalloc.c
index cc5b8adb4c83..b0011217be6c 100644
--- a/kernel/bpf/memalloc.c
+++ b/kernel/bpf/memalloc.c
@@ -499,7 +499,7 @@ static void destroy_mem_alloc(struct bpf_mem_alloc *ma, int rcu_in_progress)
 		return;
 	}
 
-	copy = kmalloc(sizeof(*ma), GFP_KERNEL);
+	copy = kmemdup(ma, sizeof(*ma), GFP_KERNEL);
 	if (!copy) {
 		/* Slow path with inline barrier-s */
 		free_mem_alloc(ma);
@@ -507,10 +507,7 @@ static void destroy_mem_alloc(struct bpf_mem_alloc *ma, int rcu_in_progress)
 	}
 
 	/* Defer barriers into worker to let the rest of map memory to be freed */
-	copy->cache = ma->cache;
-	ma->cache = NULL;
-	copy->caches = ma->caches;
-	ma->caches = NULL;
+	memset(ma, 0, sizeof(*ma));
 	INIT_WORK(&copy->work, free_mem_alloc_deferred);
 	queue_work(system_unbound_wq, &copy->work);
 }
-- 
2.34.1