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kbuild,bpf: Switch to using --btf_features for pahole v1.26 and later

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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
This commit is contained in:
Alan Maguire 2024-05-07 14:55:14 +01:00 committed by Andrii Nakryiko
parent 0d03a4d24b
commit fcd1ed89a0
1 changed files with 13 additions and 2 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

15
scripts/Makefile.btf
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@ -3,6 +3,8 @@
pahole-ver := $(CONFIG_PAHOLE_VERSION) pahole-ver := $(CONFIG_PAHOLE_VERSION)
pahole-flags-y := pahole-flags-y :=
ifeq ($(call test-le, $(pahole-ver), 125),y)
# pahole 1.18 through 1.21 can't handle zero-sized per-CPU vars # pahole 1.18 through 1.21 can't handle zero-sized per-CPU vars
ifeq ($(call test-le, $(pahole-ver), 121),y) ifeq ($(call test-le, $(pahole-ver), 121),y)
pahole-flags-$(call test-ge, $(pahole-ver), 118) += --skip_encoding_btf_vars pahole-flags-$(call test-ge, $(pahole-ver), 118) += --skip_encoding_btf_vars
@ -12,8 +14,17 @@ pahole-flags-$(call test-ge, $(pahole-ver), 121) += --btf_gen_floats
pahole-flags-$(call test-ge, $(pahole-ver), 122) += -j pahole-flags-$(call test-ge, $(pahole-ver), 122) += -j
ifeq ($(pahole-ver), 125)
pahole-flags-y += --skip_encoding_btf_inconsistent_proto --btf_gen_optimized
endif
else
# Switch to using --btf_features for v1.26 and later.
pahole-flags-$(call test-ge, $(pahole-ver), 126) = -j --btf_features=encode_force,var,float,enum64,decl_tag,type_tag,optimized_func,consistent_func
endif
pahole-flags-$(CONFIG_PAHOLE_HAS_LANG_EXCLUDE) += --lang_exclude=rust pahole-flags-$(CONFIG_PAHOLE_HAS_LANG_EXCLUDE) += --lang_exclude=rust
pahole-flags-$(call test-ge, $(pahole-ver), 125) += --skip_encoding_btf_inconsistent_proto --btf_gen_optimized
export PAHOLE_FLAGS := $(pahole-flags-y) export PAHOLE_FLAGS := $(pahole-flags-y)