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From: Ben Hutchings <benh@debian.org>
Date: Mon, 16 Sep 2024 01:54:24 +0200
Subject: kbuild, bpf: Fix BTF reproducibility
pahole 1.22 introduced the -j option for parallel processing, and
kbuild uses it, but this makes its output unreproducible.
pahole 1.27 introduced --btf_features=+reproducible_build which makes
the output reproducible even when -j is used.
Assume that if KBUILD_BUILD_TIMESTAMP is set then a reproducible build
is required, and use both options if available or neither if not.
Signed-off-by: Ben Hutchings <benh@debian.org>
---
--- a/scripts/Makefile.btf
+++ b/scripts/Makefile.btf
@@ -14,8 +14,6 @@ endif
pahole-flags-$(call test-ge, $(pahole-ver), 121) += --btf_gen_floats
-pahole-flags-$(call test-ge, $(pahole-ver), 122) += -j$(JOBS)
-
pahole-flags-$(call test-ge, $(pahole-ver), 125) += --skip_encoding_btf_inconsistent_proto --btf_gen_optimized
else
@@ -29,6 +27,18 @@ endif
endif
+# pahole 1.22 introduced the -j option for parallel processing, but
+# this makes its output unreproducible.
+# pahole 1.27 introduced --btf_features=+reproducible_build which
+# makes the output reproducible even when -j is used.
+# Assume that if KBUILD_BUILD_TIMESTAMP is set then a reproducible
+# build is required and we must not use -j alone.
+ifeq ($(KBUILD_BUILD_TIMESTAMP),)
+pahole-flags-$(call test-ge, $(pahole-ver), 122) += -j$(JOBS)
+else
+pahole-flags-$(call test-ge, $(pahole-ver), 127) += -j$(JOBS) --btf_features=+reproducible_build
+endif
+
pahole-flags-$(CONFIG_PAHOLE_HAS_LANG_EXCLUDE) += --lang_exclude=rust
export PAHOLE_FLAGS := $(pahole-flags-y)
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