# \[RFC v2 02/10\] bpf: Move u64\_to\_ptr() to BPF headers and inline it

- From: Mickaël Salaün \<mic@digikod.net\>
- Date: 2016-08-25 10:45:42 
- List: netdev
- Page: https://ratatoskr.run/netdev/2016/08/4822224
- Thread: https://ratatoskr.run/linux-api/2016/08/4822232/t.md

```text
This helper will be useful for arraymap (next commit).

Signed-off-by: Mickaël Salaün <mic@digikod.net>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Daniel Borkmann <daniel@iogearbox.net>
---
 include/linux/bpf.h  | 6 ++++++
 kernel/bpf/syscall.c | 6 ------
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 0de4de6dd43e..ca3742729ae7 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -251,6 +251,12 @@ static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
 
 /* verify correctness of eBPF program */
 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr);
+
+/* helper to convert user pointers passed inside __aligned_u64 fields */
+static inline void __user *u64_to_ptr(__u64 val)
+{
+	return (void __user *) (unsigned long) val;
+}
 #else
 static inline void bpf_register_prog_type(struct bpf_prog_type_list *tl)
 {
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 46ecce4b79ed..d305a3ce0fa7 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -247,12 +247,6 @@ struct bpf_map *bpf_map_get_with_uref(u32 ufd)
 	return map;
 }
 
-/* helper to convert user pointers passed inside __aligned_u64 fields */
-static void __user *u64_to_ptr(__u64 val)
-{
-	return (void __user *) (unsigned long) val;
-}
-
 int __weak bpf_stackmap_copy(struct bpf_map *map, void *key, void *value)
 {
 	return -ENOTSUPP;
-- 
2.8.1
```