Subject: Re: [RFC v4 02/18] bpf: Move u64_to_ptr() to BPF headers and inline it

From: Arnd Bergmann <[email-masked]>
Date: Wed, 26 Oct 2016 09:19:08 +0200

On Wednesday, October 26, 2016 8:56:38 AM CEST Mickaël Salaün wrote:
>  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 c201017b5730..cf87db6daf27 100644
> --- a/include/linux/bpf.h
> +++ b/include/linux/bpf.h
> @@ -283,6 +283,12 @@ 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
> 

We already have at least six copies of this helper:

fs/btrfs/qgroup.c:#define u64_to_ptr(x) ((struct btrfs_qgroup *)(uintptr_t)x)
kernel/bpf/syscall.c:static void __user *u64_to_ptr(__u64 val)
drivers/staging/android/ion/ion_test.c:#define u64_to_uptr(x) ((void __user *)(unsigned long)(x))
drivers/firewire/core-cdev.c:static void __user *u64_to_uptr(u64 value)
drivers/staging/android/ion/ion_test.c:#define u64_to_uptr(x) ((void __user *)(unsigned long)(x))
include/linux/kernel.h:#define u64_to_user_ptr(x) (            \

Just use the one in linux/kernel.h

	Arnd