linux-kernel - Re: [PATCH] bpf: btf: Always output invariant hit in pahole DWARF to BTF transform

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Message-ID: <20200121202916.GA204956@chrisdown.name>
Date:   Tue, 21 Jan 2020 20:29:16 +0000
From:   Chris Down <chris@...isdown.name>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Andrii Nakryiko <andriin@...com>,
        John Fastabend <john.fastabend@...il.com>,
        open list <linux-kernel@...r.kernel.org>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH] bpf: btf: Always output invariant hit in pahole DWARF to
 BTF transform

Andrii Nakryiko writes:
>> --- a/scripts/link-vmlinux.sh
>> +++ b/scripts/link-vmlinux.sh
>> @@ -108,13 +108,15 @@ gen_btf()
>>         local bin_arch
>>
>>         if ! [ -x "$(command -v ${PAHOLE})" ]; then
>> -               info "BTF" "${1}: pahole (${PAHOLE}) is not available"
>> +               printf 'BTF: %s: pahole (%s) is not available\n' \
>> +                       "${1}" "${PAHOLE}" >&2
>
>any reason not to use echo instead of printf? would be more minimal change

I generally avoid using echo because it has a bunch of portability gotchas 
which printf mostly doesn't have. If you'd prefer echo, that's fine though, 
just let me know and I can send v2.