linux-kernel - Re: [PATCH bpf-next v5 5/9] bpf: selftests: Add verifier tests for CO-RE bitfield writes

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Date:   Wed, 13 Dec 2023 15:58:39 -0800
From:   Martin KaFai Lau <martin.lau@...ux.dev>
To:     Daniel Xu <dxu@...uu.xyz>
Cc:     mykolal@...com, song@...nel.org, john.fastabend@...il.com,
        kpsingh@...nel.org, sdf@...gle.com, haoluo@...gle.com,
        jolsa@...nel.org, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org, linux-kselftest@...r.kernel.org,
        devel@...ux-ipsec.org, netdev@...r.kernel.org, ast@...nel.org,
        andrii@...nel.org, shuah@...nel.org, daniel@...earbox.net,
        steffen.klassert@...unet.com, antony.antony@...unet.com,
        alexei.starovoitov@...il.com, yonghong.song@...ux.dev,
        eddyz87@...il.com, eyal.birger@...il.com,
        Kuniyuki Iwashima <kuniyu@...zon.com>,
        Kuniyuki Iwashima <kuni1840@...il.com>
Subject: Re: [PATCH bpf-next v5 5/9] bpf: selftests: Add verifier tests for
 CO-RE bitfield writes

On 12/11/23 12:20 PM, Daniel Xu wrote:
> Add some tests that exercise BPF_CORE_WRITE_BITFIELD() macro. Since some
> non-trivial bit fiddling is going on, make sure various edge cases (such
> as adjacent bitfields and bitfields at the edge of structs) are
> exercised.

Hi DanielXu, I have pushed the libbpf changes (adding BPF_CORE_WRITE_BITFIELD) 
and verifier test in patch 3-5 which is useful by itself. e.g. Another patchset 
can start using it also: 
https://lore.kernel.org/bpf/8fccb066-6d17-4fa8-ba67-287042046ea4@linux.dev/

Thanks.