On Thu, Dec 13, 2018 at 10:44:57PM +0100, Andrea Claudi wrote:
> bytes is initialized to end - start at the beginning of this function,
> and is never changed. Remove it making the code a bit more readable.
>
> Suggested-by: Stefano Brivio <sbri...@redhat.com>
> Signed-off-by: Andrea Claudi <acla...@redhat.com>
The change looks correct.
I found the original code more intuitive to read though.
Daniel/John, thoughts?
> ---
> net/core/filter.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/net/core/filter.c b/net/core/filter.c
> index aa274679965d..f31a0de14216 100644
> --- a/net/core/filter.c
> +++ b/net/core/filter.c
> @@ -2170,8 +2170,8 @@ static const struct bpf_func_proto
> bpf_msg_cork_bytes_proto = {
> BPF_CALL_4(bpf_msg_pull_data, struct sk_msg *, msg, u32, start,
> u32, end, u64, flags)
> {
> - u32 len = 0, offset = 0, copy = 0, poffset = 0, bytes = end - start;
> u32 first_sge, last_sge, i, shift, bytes_sg_total;
> + u32 len = 0, offset = 0, copy = 0, poffset = 0;
> struct scatterlist *sge;
> u8 *raw, *to, *from;
> struct page *page;
> @@ -2196,7 +2196,7 @@ BPF_CALL_4(bpf_msg_pull_data, struct sk_msg *, msg,
> u32, start,
> /* The start may point into the sg element so we need to also
> * account for the headroom.
> */
> - bytes_sg_total = start - offset + bytes;
> + bytes_sg_total = end - offset;
> if (!msg->sg.copy[i] && bytes_sg_total <= len)
> goto out;
>
> @@ -2279,7 +2279,7 @@ BPF_CALL_4(bpf_msg_pull_data, struct sk_msg *, msg,
> u32, start,
> msg->sg.end - shift;
> out:
> msg->data = sg_virt(&msg->sg.data[first_sge]) + start - offset;
> - msg->data_end = msg->data + bytes;
> + msg->data_end = msg->data + end - start;
> return 0;
> }
>
> --
> 2.19.2
>
