Backport BTF fix needed for kernel kfuncs
Related: rhbz#2140020

Resolves: rhbz#2140020
New release: v1.23
Process DW_TAG_LLVM_annotation tags.
Initial support for DW_TAG_skeleton_unit.
Encode BTF_KIND_TYPE_TAG and BTF_KIND_DECL_TAG
Fix handling of percpu symbols on s390.
Use cacheline size to infer struct member alignment from BTF.
Add --skip_missing to not stop when not finding one of -C arguments.
Fix __attribute__((__aligned__(N)) printing alignment for struct members.
Fix nested __attribute__(__aligned__(N)) struct printing order.
New release: v1.24
Add support to BTF_KIND_ENUM64.
Support multithreaded BTF encoding.
Encode char type as signed in BTF.
Introduce --lang and --lang_exclude to pahole.
Introduce --compile to pahole.
Don't segfault when processing bogus files.

New release: v1.22
Resolves: rhbz#2010414
Introduce -j/--jobs option to specify the number of threads to use.
Multithreaded DWARF loading, requires elfutils >= 0.178.
Preparatory work for multithreaded BTF encoding, the focus for 1.23.
Allow encoding BTF to a separate file.
Show all different types with the same name, not just the first one found.
Stop assuming that reading from stdin means pretty, add --prettify.
Improve type resolution for the --header command line option.
Do not consider the ftrace filter when encoding BTF for kernel functions.
Lock calls to non-thread safe elfutils' dwarf_decl_file() and dwarf_decl_line().
Change hash table size to one that performs better with current typical vmlinux files.
Allow tweaking the hash table size from the command line.
Add --kabi_prefix to avoid deduplication woes when using _RH_KABI_REPLACE().
Add --with_flexible_array to show just types with flexible arrays.
Support btfdiff with a detached BTF file.
Introduce sorted type output (--sort).
Disable incomplete CTF encoder.

Rebuilt for IMA sigs, glibc 2.34, aarch64 flags

remove ftrace filter
New release: v1.21
DWARF loader:
Handle DWARF5 DW_OP_addrx properly
Handle subprogram ret type with abstract_origin properly
Check .notes section for LTO build info
Check .debug_abbrev for cross-CU references
Permit merging all DWARF CU's for clang LTO built binary
Factor out common code to initialize a cu
Permit a flexible HASHTAGS__BITS
Use a better hashing function, from libbpf
btf_encoder:
Add --btf_gen_all flag
Match ftrace addresses within ELF functions
Funnel ELF error reporting through a macro
Sanitize non-regular int base type
Add support for the floating-point types
Pretty printer:
Honour conf_fprintf.hex when printing enumerations

Rebuilt for RHEL 9 BETA on Apr 15th 2021. Related: rhbz#1947937

New release: v1.20
btf_encoder:
Improve ELF error reporting using elf_errmsg(elf_errno())
Improve objcopy error handling.
Fix handling of 'restrict' qualifier, that was being treated as a 'const'.
Support SHN_XINDEX in st_shndx symbol indexes
Cope with functions without a name
Fix BTF variable generation for kernel modules
Fix address size to match what is in the ELF file being processed.
Use kernel module ftrace addresses when finding which functions to encode.
libbpf:
Allow use of packaged version.
dwarf_loader:
Support DW_AT_data_bit_offset
DW_FORM_implicit_const in attr_numeric() and attr_offset()
Support DW_TAG_GNU_call_site, standardized rename of DW_TAG_GNU_call_site.
build:
Fix compilation on 32-bit architectures.

New release: 1.19
Split BTF
DWARF workarounds for DW_AT_declaration
Support cross-compiled ELF binaries with different endianness
Support showing typedefs for anonymous types
Speedups using libbpf algorithms
See changes-v1.19 for a complete and more detailed list of changes