linux-kernel - Re: [PATCH bpf-next v1] bpf,arena: Rename the kfunc set variable

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Message-ID: <CAADnVQJuL18Zkyyztkmzm54yvq3CuB4bSjoL331cmcnX_kppeA@mail.gmail.com>
Date: Tue, 7 May 2024 13:41:59 -0700
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc: Haiyue Wang <haiyue.wang@...el.com>, bpf <bpf@...r.kernel.org>, 
	Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, 
	Andrii Nakryiko <andrii@...nel.org>, Martin KaFai Lau <martin.lau@...ux.dev>, 
	Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>, 
	Yonghong Song <yonghong.song@...ux.dev>, John Fastabend <john.fastabend@...il.com>, 
	KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...gle.com>, Hao Luo <haoluo@...gle.com>, 
	Jiri Olsa <jolsa@...nel.org>, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH bpf-next v1] bpf,arena: Rename the kfunc set variable

On Tue, May 7, 2024 at 9:43 AM Andrii Nakryiko
<andrii.nakryiko@...il.com> wrote:
>
> On Tue, May 7, 2024 at 7:36 AM Alexei Starovoitov
> <alexei.starovoitov@...il.com> wrote:
> >
> > On Mon, May 6, 2024 at 7:46 PM Haiyue Wang <haiyue.wang@...el.com> wrote:
> > >
> > > Rename the kfunc set variable to specify the 'arena' function scope,
> > > although the 'UNSPEC' type BPF program is mapped to 'COMMON' hook.
> > >
> > > And there is 'common_kfunc_set' defined for real 'common' function in
> > > file 'kernel/bpf/helpers.c'.
> >
> > I think common_kfunc_set is a better name to describe that these
> > two kfuncs are in a common category.
> > BPF_PROG_TYPE_UNSPEC is a lot less obvious.
> >
> > There are two static common_kfunc_set in helpers.c and arena.c
> > and that's fine.
>
> it is actually confusing when reading/grepping code, though, so why

What's the confusion? Same name static var in different files?
There are tons of such cases in the kernel src tree.

> not have arena_common_kfunc_set and whatever the meaningful
> "qualifier" name for the other one?

arena_common_kfunc_set is certainly better than arena_kfunc_set,
but I don't like to make the precedent to start renaming static vars
because they have the same name.

> >
> > pw-bot: cr