On Mon, Jun 10, 2024 at 11:36:54PM -0700, Tony Ambardar wrote: > On Mon, Jun 03, 2024 at 08:47:24PM -0700, Tony Ambardar wrote: > > [snip] > > Arnaldo: > > Your stepping through DWARF/reloc diagnostics earlier was helpful. Thanks! > I reran your tests with the updated elfutils and latest pahole (pre-1.27), > and then found: > > - everything that worked before, still works > - your observations from "btfdiff vmlinux" and 'struct dma_chan' persist > - we now see expected output from "eu-readelf -winfo netdevsim.ko" > > Regarding pahole, DWARF parsing and BTF generation now works: > (with no more die__process: error messages seen) > > kodidev:~/linux$ pahole -F dwarf netdevsim.ko |wc -l > 14504 > > but strangely pahole still doesn't read its own generated BTF: > > kodidev:~/linux$ pahole -F btf netdevsim.ko > libbpf: Invalid BTF string section > pahole: file 'netdevsim.ko' has no btf type information. After staring at this I realized that this is split BTF and we needed to issue "pahole -F btf --btf_base vmlinux netdevsim.ko", which does work. Unfortunately, the libbpf error message is a bit cryptic; perhaps a future update could mention "--btf_base"? > > [snip] > > Many thanks everyone for your help, > Tony > > [1]: https://patchwork.sourceware.org/project/elfutils/list/?series=31601 > [2]: https://patchwork.sourceware.org/project/elfutils/list/?series=34310 > [3]: > https://github.com/guidosarducci/elfutils/commits/main-fix-mips-support-reloc/
