From: Eduard Zingerman <eddyz87@gmail.com>
To: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Cc: Andrii Nakryiko <andrii@kernel.org>,
bpf@vger.kernel.org, ast@kernel.org, daniel@iogearbox.net,
martin.lau@kernel.org, kernel-team@meta.com
Subject: Re: [PATCH v2 bpf 1/5] libbpf: feature-detect arg:ctx tag support in kernel
Date: Fri, 19 Jan 2024 02:46:40 +0200 [thread overview]
Message-ID: <b126398170c949ebdfd36d3db675ea5115f3412d.camel@gmail.com> (raw)
In-Reply-To: <CAEf4BzZ27fqvetYMQC4Y27pD40D4Fvu0mEPMf+4QJePChNHR4g@mail.gmail.com>
On Thu, 2024-01-18 at 16:43 -0800, Andrii Nakryiko wrote:
> On Thu, Jan 18, 2024 at 11:50 AM Eduard Zingerman <eddyz87@gmail.com> wrote:
[...]
> > Question:
> > suppose this is an old kernel and decl tags are not supported,
> > should negative result be cached as 0 in such case?
>
> yep, it should, and it will be eventually when
> probe_kern_arg_ctx_tag() will be plugged back into kernel_supports()
> framework. For now this small inefficiency seems fine, given it's
> temporary.
Understood, thank you.
next prev parent reply other threads:[~2024-01-19 0:46 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-17 22:33 [PATCH v2 bpf 0/5] Tighten up arg:ctx type enforcement Andrii Nakryiko
2024-01-17 22:33 ` [PATCH v2 bpf 1/5] libbpf: feature-detect arg:ctx tag support in kernel Andrii Nakryiko
2024-01-18 19:50 ` Eduard Zingerman
2024-01-19 0:43 ` Andrii Nakryiko
2024-01-19 0:46 ` Eduard Zingerman [this message]
2024-01-17 22:33 ` [PATCH v2 bpf 2/5] bpf: extract bpf_ctx_convert_map logic and make it more reusable Andrii Nakryiko
2024-01-17 22:33 ` [PATCH v2 bpf 3/5] bpf: enforce types for __arg_ctx-tagged arguments in global subprogs Andrii Nakryiko
2024-01-18 19:50 ` Eduard Zingerman
2024-01-19 0:50 ` Andrii Nakryiko
2024-01-17 22:33 ` [PATCH v2 bpf 4/5] selftests/bpf: add tests confirming type logic in kernel for __arg_ctx Andrii Nakryiko
2024-01-17 22:33 ` [PATCH v2 bpf 5/5] libbpf: warn on unexpected __arg_ctx type when rewriting BTF Andrii Nakryiko
2024-01-18 19:50 ` Eduard Zingerman
2024-01-19 0:53 ` Andrii Nakryiko
2024-01-19 1:00 ` Eduard Zingerman
2024-01-18 19:49 ` [PATCH v2 bpf 0/5] Tighten up arg:ctx type enforcement Eduard Zingerman
2024-01-18 19:53 ` Eduard Zingerman
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