linux-kernel - Re: [PATCH bpf-next v10 07/13] btf: Verify BTF Sorting

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Message-ID: <CAEf4BzZopn6gi=xf-OakYZtyv5bMy9HojSfvGznv1RiOcF5sew@mail.gmail.com>
Date: Thu, 18 Dec 2025 15:46:33 -0800
From: Andrii Nakryiko <andrii.nakryiko@...il.com>
To: Donglin Peng <dolinux.peng@...il.com>
Cc: ast@...nel.org, eddyz87@...il.com, zhangxiaoqin@...omi.com, 
	ihor.solodrai@...ux.dev, linux-kernel@...r.kernel.org, bpf@...r.kernel.org, 
	pengdonglin <pengdonglin@...omi.com>, Alan Maguire <alan.maguire@...cle.com>
Subject: Re: [PATCH bpf-next v10 07/13] btf: Verify BTF Sorting

On Thu, Dec 18, 2025 at 3:31 AM Donglin Peng <dolinux.peng@...il.com> wrote:
>
> From: pengdonglin <pengdonglin@...omi.com>
>
> This patch checks whether the BTF is sorted by name in ascending order.
> If sorted, binary search will be used when looking up types.
>
> Specifically, vmlinux and kernel module BTFs are always sorted during
> the build phase with anonymous types placed before named types, so we
> only need to identify the starting ID of named types.
>
> Cc: Eduard Zingerman <eddyz87@...il.com>
> Cc: Alexei Starovoitov <ast@...nel.org>
> Cc: Andrii Nakryiko <andrii.nakryiko@...il.com>
> Cc: Alan Maguire <alan.maguire@...cle.com>
> Cc: Ihor Solodrai <ihor.solodrai@...ux.dev>
> Cc: Xiaoqin Zhang <zhangxiaoqin@...omi.com>
> Signed-off-by: pengdonglin <pengdonglin@...omi.com>
> ---
>  kernel/bpf/btf.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 56 insertions(+)
>

please make sure to apply feedback received for libbpf-side
implementation for kernel-side implementations as well

> diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
> index 0394f0c8ef74..a9e2345558c0 100644
> --- a/kernel/bpf/btf.c
> +++ b/kernel/bpf/btf.c
> @@ -550,6 +550,60 @@ u32 btf_nr_types(const struct btf *btf)
>         return total;
>  }
>

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