linux-kernel - Re: [PATCH bpf-next 1/2] btf: allow mmap of vmlinux btf

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Message-ID: <CAN+4W8hqyi+MFS3975stXPWOxfMtdWQXPFnuvSieFzReDcV0rA@mail.gmail.com>
Date: Fri, 2 May 2025 11:19:31 +0100
From: Lorenz Bauer <lmb@...valent.com>
To: Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc: Arnd Bergmann <arnd@...db.de>, 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@...ichev.me>, Hao Luo <haoluo@...gle.com>, 
	Jiri Olsa <jolsa@...nel.org>, Mykola Lysenko <mykolal@...com>, Shuah Khan <shuah@...nel.org>, 
	linux-arch <linux-arch@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, 
	bpf <bpf@...r.kernel.org>, 
	"open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH bpf-next 1/2] btf: allow mmap of vmlinux btf

On Thu, May 1, 2025 at 9:26 PM Alexei Starovoitov
<alexei.starovoitov@...il.com> wrote:
> > +
> > +       return vm_iomap_memory(vma, virt_to_phys(__start_BTF), btf_size);
>
> and this one should probably be vm_insert_pages().
> Since it's not an IO area.

FYI I went with open coding with remap_pfn_range since that allows me
to avoid struct page.

Lorenz