Andrii Nakryiko
e83b9f5544
kbuild: add ability to generate BTF type info for vmlinux ...
This patch adds new config option to trigger generation of BTF type
information from DWARF debuginfo for vmlinux and kernel modules through
pahole, which in turn relies on libbpf for btf_dedup() algorithm.
The intent is to record compact type information of all types used
inside kernel, including all the structs/unions/typedefs/etc. This
enables BPF's compile-once-run-everywhere ([0]) approach, in which
tracing programs that are inspecting kernel's internal data (e.g.,
struct task_struct) can be compiled on a system running some kernel
version, but would be possible to run on other kernel versions (and
configurations) without recompilation, even if the layout of structs
changed and/or some of the fields were added, removed, or renamed.
This is only possible if BPF loader can get kernel type info to adjust
all the offsets correctly. This patch is a first time in this direction,
making sure that BTF type info is part of Linux kernel image in
non-loadable ELF section.
BTF deduplication ([1]) algorithm typically provides 100x savings
compared to DWARF data, so resulting .BTF section is not big as is
typically about 2MB in size.
[0] http://vger.kernel.org/lpc-bpf2018.html#session-2
[1] https://facebookmicrosites.github.io/bpf/blog/2018/11/14/btf-enhancement.html
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: Yonghong Song <yhs@fb.com>
Cc: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2019-04-03 00:53:07 +02:00
locking/atomics: Check atomic headers with sha1sum
2019-02-13 08:07:31 +01:00
kbuild: simplify dependency generation for CONFIG_TRIM_UNUSED_KSYMS
2018-12-01 23:13:14 +09:00
coccinelle: semantic code search for missing put_device()
2019-03-17 12:55:45 +09:00
of: add dtc annotations functionality to dtx_diff
2019-02-28 11:40:48 -06:00
increased structleak coverage
2019-03-09 09:06:15 -08:00
Kbuild updates for v5.1
2019-03-10 17:48:21 -07:00
genksyms: remove symbol prefix support
2018-05-17 22:43:35 +09:00
kconfig: remove stale lxdialog/.gitignore
2019-03-17 15:47:02 +09:00
modpost: always show verbose warning for section mismatch
2019-03-14 02:39:09 +09:00
kbuild: deb-pkg: avoid implicit effects
2019-03-17 12:56:23 +09:00
genheaders: %-<width>s had been there since v6; %-*s - since v7
2018-12-10 03:40:11 -05:00
scripts: Add Python 3 support to tracing/draw_functrace.py
2018-07-29 11:08:38 +09:00
scripts: remove unnecessary ihex2fw and check-lc_ctypes from .gitignore
2018-12-22 00:37:52 +09:00
kbuild: source include/config/auto.conf instead of ${KCONFIG_CONFIG}
2019-03-14 02:39:11 +09:00
ASN.1: Remove unnecessary shadowed local variable
2018-10-29 00:19:41 +09:00
kbuild: move bin2c back to scripts/ from scripts/basic/
2018-07-18 01:18:05 +09:00
bloat-o-meter: ignore __addressable_ symbols
2018-12-28 12:11:44 -08:00
bpf: change eBPF helper doc parsing script to allow for smaller indent
2018-05-17 17:34:43 +02:00
bpfilter: check compiler capability in Kconfig
2018-06-28 13:36:39 +09:00
A fairly routine cycle for docs - lots of typo fixes, some new documents,
2019-03-09 09:56:17 -08:00
scripts/checkstack.pl: dynamic stack growth for aarch64
2018-12-28 12:11:44 -08:00
checksyscalls: fix up mq_timedreceive and stat exceptions
2019-02-19 21:27:53 +01:00
kbuild: update comment block of scripts/clang-version.sh
2019-03-04 22:34:54 +09:00
coccicheck: return proper error code on fail
2018-08-14 08:58:56 +09:00
scripts/decode_stacktrace.sh: handle RIP address with segment
2019-03-05 21:07:13 -08:00
scripts/decodecode: set ARCH when running natively on arm/arm64
2018-12-28 12:11:44 -08:00
kbuild: modules_install: warn when missing System.map file
2018-09-09 09:14:07 +09:00
scripts/documentation-file-ref-check: ignore sched-pelt false positive
2018-07-02 11:25:00 -06:00
extract-vmlinux: Check for uncompressed image as fallback
2018-10-17 08:18:01 +02:00
MAINTAINERS & files: Canonize the e-mails I use at files
2018-05-04 06:21:06 -04:00
scripts/faddr2line: fix location of start_kernel in comment
2018-11-18 10:15:09 -08:00
kbuild: Use ls(1) instead of stat(1) to obtain file size
2018-03-26 02:01:24 +09:00
jump_label: move 'asm goto' support test to Kconfig
2019-01-06 09:46:51 +09:00
kbuild: clean up scripts/gcc-version.sh
2019-03-04 22:35:04 +09:00
stack-protector: test compiler capability in Kconfig and drop AUTO mode
2018-06-08 18:56:00 +09:00
stack-protector: Fix test with 32-bit userland and CONFIG_64BIT=y
2018-06-25 23:21:13 +09:00
scripts: add a tool to produce a compile_commands.json file
2018-12-19 23:41:36 +09:00
kbuild: simplify dependency generation for CONFIG_TRIM_UNUSED_KSYMS
2018-12-01 23:13:14 +09:00
get_maintainer: allow option --mpath <directory> to read all files in <directory>
2018-08-22 10:52:48 -07:00
kbuild: Improve portability of some sed invocations
2018-03-26 02:01:18 +09:00
Kbuild updates for v5.1
2019-03-10 17:48:21 -07:00
kbuild: remove cc-version macro
2019-03-04 22:34:59 +09:00
kbuild: clean up scripts/gcc-version.sh
2019-03-04 22:35:04 +09:00
kernel-doc: suppress 'not described' warnings for embedded struct fields
2019-01-16 15:04:01 -07:00
leaking_addresses: Completely remove --version flag
2019-03-07 08:53:18 +11:00
kbuild: add ability to generate BTF type info for vmlinux
2019-04-03 00:53:07 +02:00
scripts/gdb: do not descend into scripts/gdb from scripts
2019-02-27 21:40:09 +09:00
kbuild: force all architectures except um to include mandatory-y
2019-03-17 12:56:32 +09:00
kbuild: move archive command to scripts/Makefile.lib
2019-03-14 02:39:10 +09:00
kbuild: remove deprecated host-progs variable
2018-08-09 21:51:17 +09:00
Kbuild updates for v4.20 (2nd)
2018-11-03 10:47:33 -07:00
gcc-plugins: structleak: Generalize to all variable types
2019-03-04 09:29:41 -08:00
kbuild: generate asm-generic wrappers if mandatory headers are missing
2019-01-06 09:46:51 +09:00
kbuild: skip 'addtree' and 'flags' magic for external module build
2019-01-28 09:11:17 +09:00
kasan: remove use after scope bugs detection.
2019-03-05 21:07:13 -08:00
kcov: test compiler capability in Kconfig and correct dependency
2018-06-11 09:14:08 +09:00
kbuild: move archive command to scripts/Makefile.lib
2019-03-14 02:39:10 +09:00
Kbuild: Makefile.modbuiltin: include auto.conf and tristate.conf mandatory
2018-08-03 00:47:00 +09:00
Revert "modsign: Abort modules_install when signing fails"
2019-03-17 12:56:31 +09:00
modpost: always show verbose warning for section mismatch
2019-03-14 02:39:09 +09:00
kbuild: remove duplicated comments about PHONY
2018-07-06 22:04:03 +09:00
lib/ubsan: remove null-pointer checks
2018-08-10 20:19:58 -07:00
kbuild: remove unnecessary in-subshell execution
2019-01-28 09:11:17 +09:00
kbuild: simplify command line creation in scripts/mkmakefile
2018-10-04 22:56:02 +09:00
kbuild: rename built-in.o to built-in.a
2018-03-26 02:01:19 +09:00
scripts/recordmcount.{c,pl}: support -ffunction-sections .text.* section names
2018-12-08 20:54:08 -05:00
scripts: Fixed printf format mismatch
2018-05-29 22:04:12 +09:00
scripts/recordmcount.{c,pl}: support -ffunction-sections .text.* section names
2018-12-08 20:54:08 -05:00
scripts/setlocalversion: Improve -dirty check with git-status --no-optional-locks
2018-11-21 23:57:33 +09:00
scripts: add spdxcheck.py self test
2018-12-28 12:11:44 -08:00
scripts/spdxcheck.py: fix C++ comment style detection
2019-02-22 08:47:05 -07:00
scripts/spelling.txt: add more spellings to spelling.txt
2019-03-07 18:31:59 -08:00
MAINTAINERS & files: Canonize the e-mails I use at files
2018-05-04 06:21:06 -04:00
selftests: add headers_install to lib.mk
2018-09-05 08:12:09 -06:00
scripts/tags.sh: add more declarations
2018-12-28 12:11:44 -08:00
unifdef: use memcpy instead of strncpy
2018-11-30 14:45:01 -08:00
ver_linux: Assign constant RE to variable name for clarity
2019-01-22 13:34:35 +01:00
e83b9f5544