Messages in this thread | ![/](/images/icornerl.gif) | | Date | Mon, 12 Sep 2022 23:37:56 +0800 | Subject | Re: [PATCH] libbpf: Support raw btf placed in the default path | From | Tao Chen <> |
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在 2022/9/10 上午3:00, Andrii Nakryiko 写道: > On Sun, Aug 28, 2022 at 10:36 PM Tao Chen > <chentao.kernel@linux.alibaba.com> wrote: >> >> Hi Nakryiko, thank you for your reply. Yes, i happed to put the raw >> BTF made by myself in /boot on kernel4.19, unluckly it reported error. >> So is it possible to allow the raw BTF in /boot directly, athough we >> can set the specified btf location again to solve the problem with the >> bpf_object_open_opts interface. >> >> As you say, maybe we can remove the locations[i].raw_btf check, just >> use the btf__parse, It looks more concise. > > Please don't top post, reply inline (that's kernel mail lists rules). > > But yes, I think we can just use btf__parse and let libbpf figure out. > Please send a patch. >
Thank you, i will send the patch in v2. >> >> 在 2022/8/26 上午4:26, Andrii Nakryiko 写道: >> >> On Wed, Aug 24, 2022 at 7:05 AM chentao.ct >> <chentao.kernel@linux.alibaba.com> wrote: >> >> Now only elf btf can be placed in the default path, raw btf should >> also can be there. >> >> It's not clear what you are trying to achieve. Do you want libbpf to >> attempt to load /boot/vmlinux-%1$s as raw BTF as well (so you can sort >> of sneak in pregenerated BTF), or what exactly? >> btf__load_vmlinux_btf() code already supports loading raw BTF, it just >> needs to be explicitly specified in locations table. >> >> So with your change locations[i].raw_btf check doesn't make sense and >> we need to clean this up. >> >> But first, let's discuss the use case, instead of your specific solution. >> >> >> Signed-off-by: chentao.ct <chentao.kernel@linux.alibaba.com> >> --- >> tools/lib/bpf/btf.c | 4 ++-- >> 1 file changed, 2 insertions(+), 2 deletions(-) >> >> diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c >> index bb1e06e..b22b5b3 100644 >> --- a/tools/lib/bpf/btf.c >> +++ b/tools/lib/bpf/btf.c >> @@ -4661,7 +4661,7 @@ struct btf *btf__load_vmlinux_btf(void) >> } locations[] = { >> /* try canonical vmlinux BTF through sysfs first */ >> { "/sys/kernel/btf/vmlinux", true /* raw BTF */ }, >> - /* fall back to trying to find vmlinux ELF on disk otherwise */ >> + /* fall back to trying to find vmlinux RAW/ELF on disk otherwise */ >> { "/boot/vmlinux-%1$s" }, >> { "/lib/modules/%1$s/vmlinux-%1$s" }, >> { "/lib/modules/%1$s/build/vmlinux" }, >> @@ -4686,7 +4686,7 @@ struct btf *btf__load_vmlinux_btf(void) >> if (locations[i].raw_btf) >> btf = btf__parse_raw(path); >> else >> - btf = btf__parse_elf(path, NULL); >> + btf = btf__parse(path, NULL); >> err = libbpf_get_error(btf); >> pr_debug("loading kernel BTF '%s': %d\n", path, err); >> if (err) >> -- >> 2.2.1 >>
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