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46fb0b62ea
Support creation of module BTF along with distilled base BTF; the latter is stored in a .BTF.base ELF section and supplements split BTF references to base BTF with information about base types, allowing for later relocation of split BTF with a (possibly changed) base. resolve_btfids detects the presence of a .BTF.base section and will use it instead of the base BTF it is passed in BTF id resolution. Modules will be built with a distilled .BTF.base section for external module build, i.e. make -C. -M=path2/module ...while in-tree module build as part of a normal kernel build will not generate distilled base BTF; this is because in-tree modules change with the kernel and do not require BTF relocation for the running vmlinux. Signed-off-by: Alan Maguire <alan.maguire@oracle.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Reviewed-by: Eduard Zingerman <eddyz87@gmail.com> Link: https://lore.kernel.org/bpf/20240620091733.1967885-6-alan.maguire@oracle.com
34 lines
1.1 KiB
Makefile
34 lines
1.1 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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pahole-ver := $(CONFIG_PAHOLE_VERSION)
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pahole-flags-y :=
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ifeq ($(call test-le, $(pahole-ver), 125),y)
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# pahole 1.18 through 1.21 can't handle zero-sized per-CPU vars
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ifeq ($(call test-le, $(pahole-ver), 121),y)
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pahole-flags-$(call test-ge, $(pahole-ver), 118) += --skip_encoding_btf_vars
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endif
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pahole-flags-$(call test-ge, $(pahole-ver), 121) += --btf_gen_floats
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pahole-flags-$(call test-ge, $(pahole-ver), 122) += -j
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pahole-flags-$(call test-ge, $(pahole-ver), 125) += --skip_encoding_btf_inconsistent_proto --btf_gen_optimized
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else
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# Switch to using --btf_features for v1.26 and later.
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pahole-flags-$(call test-ge, $(pahole-ver), 126) = -j --btf_features=encode_force,var,float,enum64,decl_tag,type_tag,optimized_func,consistent_func,decl_tag_kfuncs
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ifneq ($(KBUILD_EXTMOD),)
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module-pahole-flags-$(call test-ge, $(pahole-ver), 126) += --btf_features=distilled_base
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endif
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endif
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pahole-flags-$(CONFIG_PAHOLE_HAS_LANG_EXCLUDE) += --lang_exclude=rust
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export PAHOLE_FLAGS := $(pahole-flags-y)
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export MODULE_PAHOLE_FLAGS := $(module-pahole-flags-y)
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