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From:   Toke =?utf-8?Q?H=C3=B8iland-J=C3=B8rgensen?= <toke@redhat.com>
To:     Andrii Nakryiko <andrii.nakryiko@gmail.com>
Cc:     Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Martin KaFai Lau <kafai@fb.com>,
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        Andrii Nakryiko <andriin@fb.com>,
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        Jason Gunthorpe <jgg@ziepe.ca>,
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Subject: Re: [PATCH bpf-next v4 02/10] tools/bpf/runqslower: Fix override option for VMLINUX_BTF
In-Reply-To: <CAEf4BzY3RM3LS3bvU4dHY+8U27RaezeaC9rfuW1YLAcFQEQKEA@mail.gmail.com>
References: <157926819690.1555735.10756593211671752826.stgit@toke.dk> <157926819920.1555735.13051810516683828343.stgit@toke.dk> <CAEf4BzY3RM3LS3bvU4dHY+8U27RaezeaC9rfuW1YLAcFQEQKEA@mail.gmail.com>
Date:   Mon, 20 Jan 2020 12:04:09 +0100
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Andrii Nakryiko <andrii.nakryiko@gmail.com> writes:

> On Fri, Jan 17, 2020 at 5:37 AM Toke H=C3=B8iland-J=C3=B8rgensen <toke@re=
dhat.com> wrote:
>>
>> From: Toke H=C3=B8iland-J=C3=B8rgensen <toke@redhat.com>
>>
>> The runqslower tool refuses to build without a file to read vmlinux BTF
>> from. The build fails with an error message to override the location by
>> setting the VMLINUX_BTF variable if autodetection fails. However, the
>> Makefile doesn't actually work with that override - the error message is
>> still emitted.
>>
>> Fix this by including the value of VMLINUX_BTF in the expansion, and only
>> emitting the error message if the *result* is empty. Also permit running
>> 'make clean' even though no VMLINUX_BTF is set.
>>
>> Fixes: 9c01546d26d2 ("tools/bpf: Add runqslower tool to tools/bpf")
>> Signed-off-by: Toke H=C3=B8iland-J=C3=B8rgensen <toke@redhat.com>
>> ---
>
> approach looks good, thanks, few nits below
>
>>  tools/bpf/runqslower/Makefile |   18 +++++++++---------
>>  1 file changed, 9 insertions(+), 9 deletions(-)
>>
>> diff --git a/tools/bpf/runqslower/Makefile b/tools/bpf/runqslower/Makefi=
le
>> index cff2fbcd29a8..b62fc9646c39 100644
>> --- a/tools/bpf/runqslower/Makefile
>> +++ b/tools/bpf/runqslower/Makefile
>> @@ -10,13 +10,9 @@ CFLAGS :=3D -g -Wall
>>
>>  # Try to detect best kernel BTF source
>>  KERNEL_REL :=3D $(shell uname -r)
>> -ifneq ("$(wildcard /sys/kernel/btf/vmlinux)","")
>> -VMLINUX_BTF :=3D /sys/kernel/btf/vmlinux
>> -else ifneq ("$(wildcard /boot/vmlinux-$(KERNEL_REL))","")
>> -VMLINUX_BTF :=3D /boot/vmlinux-$(KERNEL_REL)
>> -else
>> -$(error "Can't detect kernel BTF, use VMLINUX_BTF to specify it explici=
tly")
>> -endif
>> +VMLINUX_BTF_PATHS :=3D /sys/kernel/btf/vmlinux /boot/vmlinux-$(KERNEL_R=
EL)
>> +VMLINUX_BTF_PATH :=3D $(abspath $(or $(VMLINUX_BTF),$(firstword \
>> +       $(wildcard $(VMLINUX_BTF_PATHS)))))
>
> you can drop abspath, relative path for VMLINUX_BTF would work just fine

OK.

>>
>>  abs_out :=3D $(abspath $(OUTPUT))
>>  ifeq ($(V),1)
>> @@ -67,9 +63,13 @@ $(OUTPUT):
>>         $(call msg,MKDIR,$@)
>>         $(Q)mkdir -p $(OUTPUT)
>>
>> -$(OUTPUT)/vmlinux.h: $(VMLINUX_BTF) | $(OUTPUT) $(BPFTOOL)
>> +$(OUTPUT)/vmlinux.h: $(VMLINUX_BTF_PATH) | $(OUTPUT) $(BPFTOOL)
>>         $(call msg,GEN,$@)
>> -       $(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@
>> +       @if [ ! -e "$(VMLINUX_BTF_PATH)" ] ; then \
>
> $(Q), not @

This was actually deliberate, since I was replacing an $(error) (which
doesn't show up in V=3D1 output). But OK, I guess we can output the whole
if statement as well on verbose builds...

>> +               echo "Couldn't find kernel BTF; set VMLINUX_BTF to speci=
fy its location."; \
>> +               exit 1;\
>
> nit: please align \'s (same above for VMLONUX_BTF_PATH) at the right
> edge as it's done everywhere in this Makefile

Right, I'll try to fix those up (for the whole series). My emacs is
being a bit weird with displaying tabstops, so some of these look
aligned when I'm editing. I'll see if I can figure out how to fix this
so it becomes obvious while I'm making changes...

-Toke