linux-kernel - Re: [PATCH bpf-next] bpf: Remove redundant assignment to smap->map.value

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Message-ID: <CAJnrk1YF3PiiHFgQu2K4LN2P-Lx4obQOoQohdgXhG4Fg6WogHg@mail.gmail.com>
Date:   Wed, 23 Mar 2022 10:26:15 -0700
From:   Joanne Koong <joannelkoong@...il.com>
To:     Yuntao Wang <ytcoode@...il.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, netdev@...r.kernel.org,
        bpf <bpf@...r.kernel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next] bpf: Remove redundant assignment to smap->map.value_size

On Wed, Mar 23, 2022 at 2:21 AM Yuntao Wang <ytcoode@...il.com> wrote:
>
> The attr->value_size is already assigned to smap->map.value_size
> in bpf_map_init_from_attr(), there is no need to do it again in
> stack_map_alloc()
>
> Signed-off-by: Yuntao Wang <ytcoode@...il.com>

LGTM.
Acked-by: Joanne Koong <joannelkoong@...il.com>

> ---
>  kernel/bpf/stackmap.c | 1 -
>  1 file changed, 1 deletion(-)
>
> diff --git a/kernel/bpf/stackmap.c b/kernel/bpf/stackmap.c
> index 34725bfa1e97..6131b4a19572 100644
> --- a/kernel/bpf/stackmap.c
> +++ b/kernel/bpf/stackmap.c
> @@ -106,7 +106,6 @@ static struct bpf_map *stack_map_alloc(union bpf_attr *attr)
>                 return ERR_PTR(-ENOMEM);
>
>         bpf_map_init_from_attr(&smap->map, attr);
> -       smap->map.value_size = value_size;
>         smap->n_buckets = n_buckets;
>
>         err = get_callchain_buffers(sysctl_perf_event_max_stack);
> --
> 2.35.0.rc2
>