From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Alexei Starovoitov <ast@fb.com>
Cc: Martin KaFai Lau <kafai@fb.com>,
netdev@vger.kernel.org, Daniel Borkmann <daniel@iogearbox.net>,
kernel-team@fb.com, Wang Nan <wangnan0@huawei.com>,
Jiri Olsa <jolsa@kernel.org>, Namhyung Kim <namhyung@kernel.org>,
Ingo Molnar <mingo@kernel.org>
Subject: Re: [PATCH bpf-next v5 00/10] BTF: BPF Type Format
Date: Thu, 14 Jun 2018 15:00:17 -0300 [thread overview]
Message-ID: <20180614180017.GJ30043@kernel.org> (raw)
In-Reply-To: <20180614174759.GI30043@kernel.org>
Em Thu, Jun 14, 2018 at 02:47:59PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Thu, Jun 14, 2018 at 10:21:30AM -0700, Alexei Starovoitov escreveu:
> > On 6/14/18 10:18 AM, Arnaldo Carvalho de Melo wrote:
> > > Just out of curiosity, is there any plan to have this as a clang option?
> > I think
> > clang ... -mllvm -mattr=dwarfris
> > should work.
> The message "(LLVM option parsing)" implies what you suggest, but didn't
> worked :-\
> -mllvm <value> Additional arguments to forward to LLVM's option processing
> Almost there tho :-\
So I thought that this -mattr=dwarfris would be available only after I
set the target, because I tried 'llc -mattr=help' and dwarfris wasn't
there:
[acme@jouet perf]$ llc -mattr=help |& grep dwarf
[acme@jouet perf]$
Only after I set the arch it appears:
[acme@jouet perf]$ llc -march=bpf -mattr=help |& grep dwarf
dwarfris - Disable MCAsmInfo DwarfUsesRelocationsAcrossSections.
dwarfris - Disable MCAsmInfo DwarfUsesRelocationsAcrossSections.
dwarfris - Disable MCAsmInfo DwarfUsesRelocationsAcrossSections.
[acme@jouet perf]$
But even after moving the '-mllvm -mattr=dwarfris' to after '-target
bpf' it still can't grok it :-\
/usr/local/bin/clang -D__KERNEL__ -D__NR_CPUS__=4 -DLINUX_VERSION_CODE=0x41100 -g -nostdinc -isystem /usr/lib/gcc/x86_64-redhat-linux/7/include -I/home/acme/git/linux/arch/x86/include -I./arch/x86/include/generated -I/home/acme/git/linux/include -I./include -I/home/acme/git/linux/arch/x86/include/uapi -I./arch/x86/include/generated/uapi -I/home/acme/git/linux/include/uapi -I./include/generated/uapi -include /home/acme/git/linux/include/linux/kconfig.h -I/home/acme/lib/include/perf/bpf -Wno-unused-value -Wno-pointer-sign -working-directory /lib/modules/4.17.0-rc5/build -c /home/acme/bpf/hello.c -target bpf -mllvm -mattr=dwarfris -O2 -o hello.o
So onlye with 'clang ... -target bpf -emit-llvm -O2 -o - | llc -march=bpf -mattr=dwarfris ...'
things work as we expect.
- Arnaldo
next prev parent reply other threads:[~2018-06-14 18:00 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-18 22:55 [PATCH bpf-next v5 00/10] BTF: BPF Type Format Martin KaFai Lau
2018-04-18 22:55 ` [PATCH bpf-next v5 01/10] bpf: btf: Introduce BPF Type Format (BTF) Martin KaFai Lau
2018-04-18 22:55 ` [PATCH bpf-next v5 02/10] bpf: btf: Validate type reference Martin KaFai Lau
2018-04-18 22:55 ` [PATCH bpf-next v5 03/10] bpf: btf: Check members of struct/union Martin KaFai Lau
2018-04-18 22:56 ` [PATCH bpf-next v5 04/10] bpf: btf: Add pretty print capability for data with BTF type info Martin KaFai Lau
2018-04-18 22:56 ` [PATCH bpf-next v5 05/10] bpf: btf: Add BPF_BTF_LOAD command Martin KaFai Lau
2018-04-18 22:56 ` [PATCH bpf-next v5 06/10] bpf: btf: Add BPF_OBJ_GET_INFO_BY_FD support to BTF fd Martin KaFai Lau
2018-04-18 22:56 ` [PATCH bpf-next v5 07/10] bpf: btf: Add pretty print support to the basic arraymap Martin KaFai Lau
2018-04-18 22:56 ` [PATCH bpf-next v5 08/10] bpf: btf: Sync bpf.h and btf.h to tools/ Martin KaFai Lau
2018-04-18 22:56 ` [PATCH bpf-next v5 09/10] bpf: btf: Add BTF support to libbpf Martin KaFai Lau
2018-05-09 22:17 ` libbpf backward compatibility (was: [PATCH bpf-next v5 09/10] bpf: btf: Add BTF support to libbpf) Jakub Kicinski
2018-05-09 22:20 ` Jakub Kicinski
2018-04-18 22:56 ` [PATCH bpf-next v5 10/10] bpf: btf: Add BTF tests Martin KaFai Lau
2018-04-19 19:40 ` [PATCH bpf-next v5 00/10] BTF: BPF Type Format Arnaldo Carvalho de Melo
2018-04-19 20:58 ` Martin KaFai Lau
2018-06-05 21:25 ` Martin KaFai Lau
2018-06-06 12:33 ` Arnaldo Carvalho de Melo
2018-06-07 13:54 ` Arnaldo Carvalho de Melo
2018-06-07 14:03 ` Arnaldo Carvalho de Melo
2018-06-07 19:05 ` Martin KaFai Lau
2018-06-07 19:30 ` Arnaldo Carvalho de Melo
2018-06-07 20:07 ` Martin KaFai Lau
2018-06-07 20:25 ` Arnaldo Carvalho de Melo
2018-06-12 20:31 ` Arnaldo Carvalho de Melo
2018-06-12 20:41 ` Arnaldo Carvalho de Melo
2018-06-13 23:26 ` Martin KaFai Lau
2018-06-14 15:03 ` Arnaldo Carvalho de Melo
2018-06-14 16:22 ` Martin KaFai Lau
2018-06-14 17:18 ` Arnaldo Carvalho de Melo
2018-06-14 17:21 ` Alexei Starovoitov
2018-06-14 17:41 ` Arnaldo Carvalho de Melo
2018-06-14 17:47 ` Arnaldo Carvalho de Melo
2018-06-14 18:00 ` Arnaldo Carvalho de Melo [this message]
2018-06-15 4:56 ` Yonghong Song
2018-06-15 14:24 ` Arnaldo Carvalho de Melo
2018-06-15 16:06 ` Yonghong Song
2018-06-15 11:20 ` Bo YU
2018-04-19 23:57 ` Daniel Borkmann
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