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From:   Alexei Starovoitov <alexei.starovoitov@gmail.com>
Date:   Fri, 21 Jan 2022 17:12:14 -0800
Message-ID: <CAADnVQLOpgGG9qfR4EAgzrdMrfSg9ftCY=9psR46GeBWP7aDvQ@mail.gmail.com>
Subject: Re: [PATCH v6 bpf-next 6/7] bpf: introduce bpf_prog_pack allocator
To:     Song Liu <songliubraving@fb.com>
Cc:     Song Liu <song@kernel.org>, bpf <bpf@vger.kernel.org>,
        Network Development <netdev@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Andrii Nakryiko <andrii@kernel.org>,
        Kernel Team <Kernel-team@fb.com>,
        Peter Zijlstra <peterz@infradead.org>, X86 ML <x86@kernel.org>
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On Fri, Jan 21, 2022 at 5:01 PM Song Liu <songliubraving@fb.com> wrote:
>
> In this way, we need to allocate rw_image here, and free it in
> bpf_jit_comp.c. This feels a little weird to me, but I guess that
> is still the cleanest solution for now.

You mean inside bpf_jit_binary_alloc?
That won't be arch independent.
It needs to be split into generic piece that stays in core.c
and callbacks like bpf_jit_fill_hole_t
or into multiple helpers with prep in-between.
Don't worry if all archs need to be touched.