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Extract .BTF.inline via the following logic:
- Traverse all types reachable from LOC_PARAM, LOC_PROTO, LOCSEC
entries and mark them as having LOC color.
- Traverse all types reachable from the remaining types
and mark them as having MAIN or SHARED.
- Create a new base BTF object and copy all MAIN/SHARED types there.
- Create a new .BTF.inline object with base set to the new base BTF
object, and copy all LOC types there.
This way .BTF.inline can refer to types and strings in the new base,
and strings used only by .BTF.inline remain in it.
Additionally, all BTF_KIND_FUNC types that map to ELF symbols with the
same name are forced to be in the base BTF. Same for types referenced
from BTF id sets.
Regular types referenced only from .BTF.inline remain in the base BTF,
and sizes are 5 and 9.5Mb for vmlinux and vmlinux.inline respectively.
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://patch.msgid.link/20261009112324.1442319-2-alan.maguire@oracle.com
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Making resolve_btfids to be compiled as host program so
we can avoid cross compile issues as reported by Nathan.
Also we no longer need HOST_OVERRIDES for BINARY target,
just for 'prepare' targets.
Fixes: 13e07691a16f ("tools/resolve_btfids: Alter how HOSTCC is forced")
Reported-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Acked-by: Ian Rogers <irogers@google.com>
Link: https://lore.kernel.org/bpf/20230202112839.1131892-1-jolsa@kernel.org
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The resolve_btfids tool scans elf object for .BTF_ids section
and resolves its symbols with BTF ID values.
It will be used to during linking time to resolve arrays of BTF
ID values used in verifier, so these IDs do not need to be
resolved in runtime.
The expected layout of .BTF_ids section is described in main.c
header. Related kernel changes are coming in following changes.
Build issue reported by 0-DAY CI Kernel Test Service.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200711215329.41165-2-jolsa@kernel.org
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