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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kbuild,bpf: Switch to using --btf_features for pahole v1.26 and later

The btf_features list can be used for pahole v1.26 and later -
it is useful because if a feature is not yet implemented it will
not exit with a failure message. This will allow us to add feature
requests to the pahole options without having to check pahole versions
in future; if the version of pahole supports the feature it will be
added.

Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Tested-by: Eduard Zingerman <eddyz87@gmail.com>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20240507135514.490467-1-alan.maguire@oracle.com

authored by

Alan Maguire and committed by
Andrii Nakryiko fcd1ed89 0d03a4d2

+13 -2
+13 -2
scripts/Makefile.btf
··· 3 3 pahole-ver := $(CONFIG_PAHOLE_VERSION) 4 4 pahole-flags-y := 5 5 6 + ifeq ($(call test-le, $(pahole-ver), 125),y) 7 + 6 8 # pahole 1.18 through 1.21 can't handle zero-sized per-CPU vars 7 9 ifeq ($(call test-le, $(pahole-ver), 121),y) 8 10 pahole-flags-$(call test-ge, $(pahole-ver), 118) += --skip_encoding_btf_vars ··· 14 12 15 13 pahole-flags-$(call test-ge, $(pahole-ver), 122) += -j 16 14 17 - pahole-flags-$(CONFIG_PAHOLE_HAS_LANG_EXCLUDE) += --lang_exclude=rust 15 + ifeq ($(pahole-ver), 125) 16 + pahole-flags-y += --skip_encoding_btf_inconsistent_proto --btf_gen_optimized 17 + endif 18 18 19 - pahole-flags-$(call test-ge, $(pahole-ver), 125) += --skip_encoding_btf_inconsistent_proto --btf_gen_optimized 19 + else 20 + 21 + # Switch to using --btf_features for v1.26 and later. 22 + pahole-flags-$(call test-ge, $(pahole-ver), 126) = -j --btf_features=encode_force,var,float,enum64,decl_tag,type_tag,optimized_func,consistent_func 23 + 24 + endif 25 + 26 + pahole-flags-$(CONFIG_PAHOLE_HAS_LANG_EXCLUDE) += --lang_exclude=rust 20 27 21 28 export PAHOLE_FLAGS := $(pahole-flags-y)