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From: Jay Wang <wanjay@amazon.com>
To: <olsajiri@gmail.com>, <bpf@vger.kernel.org>, <ast@kernel.org>,
	<daniel@iogearbox.net>, <andrii@kernel.org>, <eddyz87@gmail.com>,
	<memxor@gmail.com>
Cc: <bot+bpf-ci@kernel.org>, <alan.maguire@oracle.com>,
	<martin.lau@linux.dev>, <yonghong.song@linux.dev>,
	<nathan@kernel.org>, <nsc@kernel.org>,
	<linux-kbuild@vger.kernel.org>, <mcgrof@kernel.org>,
	<petr.pavlu@suse.com>, <linux-modules@vger.kernel.org>,
	<arnd@arndb.de>, <linux-kernel@vger.kernel.org>,
	<abuehaze@amazon.com>, <doebel@amazon.de>,
	<jay.wang.upstream@gmail.com>, <martin.lau@kernel.org>,
	<mason@kernel.org>, <ihor.solodrai@linux.dev>
Subject: Re: [PATCH bpf-next 3/6] bpf: fetch the vmlinux BTF where kernel types enter a program
Date: Fri, 25 Sep 2026 23:02:50 +0000	[thread overview]
Message-ID: <20260925230250.34076-1-wanjay@amazon.com> (raw)
In-Reply-To: <arUI7ORFZCegI5ep@krava>

On Thu, Sep 24, 2026 at 01:26:36PM +0200, Jiri Olsa wrote:
> seems valid to me, could we just check for these two print helpers in
> helper_uses_vmlinux_btf ?

Yes, that is what the series does since v2 (now v3, patch 3/9):
https://lore.kernel.org/bpf/20260925224229.1850-1-wanjay@amazon.com/

helper_uses_vmlinux_btf() also matches BPF_FUNC_snprintf_btf and
BPF_FUNC_seq_printf_btf, so the verifier loads the vmlinux BTF when a
program calls either of them, and the runtime peek in
bpf_btf_printf_prepare() then always finds it.  Tested with a raw_tp
program calling bpf_snprintf_btf() as the first BTF user after boot.

Thanks,
Jay

  reply	other threads:[~2026-09-25 23:02 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-09-23  5:39 [PATCH bpf-next 0/6] bpf: make the vmlinux BTF an on-demand loadable module (CONFIG_DEBUG_INFO_BTF=m) to save ~5.4 MB memory Jay Wang
2026-09-23  5:39 ` [PATCH bpf-next 1/6] bpf: pass the vmlinux BTF to btf_parse_module() and let it adopt the data Jay Wang
2026-09-23  5:39 ` [PATCH bpf-next 2/6] bpf: split the kfunc, dtor kfunc and struct_ops registration bodies Jay Wang
2026-09-23  6:16   ` bot+bpf-ci
2026-09-25 23:02     ` Jay Wang
2026-09-23  5:39 ` [PATCH bpf-next 3/6] bpf: fetch the vmlinux BTF where kernel types enter a program Jay Wang
2026-09-23  6:28   ` bot+bpf-ci
2026-09-24 11:26     ` Jiri Olsa
2026-09-25 23:02       ` Jay Wang [this message]
2026-09-25 23:02     ` Jay Wang
2026-09-23  5:39 ` [PATCH bpf-next 4/6] bpf: take the vmlinux BTF from the btf_vmlinux module Jay Wang
2026-09-23  5:39 ` [PATCH bpf-next 5/6] bpf: defer registrations until the vmlinux BTF is available Jay Wang
2026-09-23  6:41   ` bot+bpf-ci
2026-09-25 23:02     ` Jay Wang
2026-09-23  5:39 ` [PATCH bpf-next 6/6] kbuild, bpf: allow building the vmlinux BTF as a module Jay Wang
2026-09-23  8:27 ` [PATCH bpf-next 0/6] bpf: make the vmlinux BTF an on-demand loadable module (CONFIG_DEBUG_INFO_BTF=m) to save ~5.4 MB memory Alan Maguire
2026-09-25 21:23   ` Jay Wang

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