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SubjectRe: ERROR: INT DW_ATE_unsigned_1 Error emitting BTF type
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On 2/5/21 12:31 PM, Sedat Dilek wrote:
> On Fri, Feb 5, 2021 at 9:03 PM Yonghong Song <yhs@fb.com> wrote:
>>
>>
>>
>> On 2/5/21 11:24 AM, Arnaldo Carvalho de Melo wrote:
>>> Em Fri, Feb 05, 2021 at 11:10:08AM -0800, Yonghong Song escreveu:
>>>> On 2/5/21 11:06 AM, Sedat Dilek wrote:
>>>>> On Fri, Feb 5, 2021 at 7:53 PM Sedat Dilek <sedat.dilek@gmail.com> wrote:
>>>>> Grepping through linux.git/tools I guess some BTF tools/libs need to
>>>>> know what BTF_INT_UNSIGNED is?
>>>
>>>> BTF_INT_UNSIGNED needs kernel support. Maybe to teach pahole to
>>>> ignore this for now until kernel infrastructure is ready.
>>>
>>> Yeah, I thought about doing that.
>>>
>>>> Not sure whether this information will be useful or not
>>>> for BTF. This needs to be discussed separately.
>>>
>>> Maybe search for the rationale for its introduction in DWARF.
>>
>> In LLVM, we have:
>> uint8_t BTFEncoding;
>> switch (Encoding) {
>> case dwarf::DW_ATE_boolean:
>> BTFEncoding = BTF::INT_BOOL;
>> break;
>> case dwarf::DW_ATE_signed:
>> case dwarf::DW_ATE_signed_char:
>> BTFEncoding = BTF::INT_SIGNED;
>> break;
>> case dwarf::DW_ATE_unsigned:
>> case dwarf::DW_ATE_unsigned_char:
>> BTFEncoding = 0;
>> break;
>>
>> I think DW_ATE_unsigned can be ignored in pahole since
>> the default encoding = 0. A simple comment is enough.
>>
>
> Yonghong Son, do you have a patch/diff for me?

Looking at error message from log:

LLVM_OBJCOPY=/opt/binutils/bin/objcopy /opt/pahole/bin/pahole -J
.tmp_vmlinux.btf
[115] INT DW_ATE_unsigned_1 Error emitting BTF type
Encountered error while encoding BTF.

Not exactly what is the root cause. Maybe bt->bit_size is not
encoded correctly. Could you put vmlinux (in the above it is
.tmp_vmlinux.btf) somewhere, I or somebody else can investigate
and provide a proper fix.

> Thanks.
>
> - Sedat -
>

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