46 lines
1.5 KiB
Diff
46 lines
1.5 KiB
Diff
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From: Ben Hutchings <benh@debian.org>
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Date: Mon, 16 Sep 2024 01:54:24 +0200
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Subject: kbuild, bpf: Fix BTF reproducibility
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pahole 1.22 introduced the -j option for parallel processing, and
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kbuild uses it, but this makes its output unreproducible.
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pahole 1.27 introduced --btf_features=+reproducible_build which makes
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the output reproducible even when -j is used.
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Assume that if KBUILD_BUILD_TIMESTAMP is set then a reproducible build
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is required, and use both options if available or neither if not.
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Signed-off-by: Ben Hutchings <benh@debian.org>
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---
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--- a/scripts/Makefile.btf
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+++ b/scripts/Makefile.btf
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@@ -12,8 +12,6 @@ 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, $(pahole-ver), 122) += -j
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-
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pahole-flags-$(call test-ge, $(pahole-ver), 125) += --skip_encoding_btf_inconsistent_proto --btf_gen_optimized
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else
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@@ -27,6 +25,18 @@ endif
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endif
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+# pahole 1.22 introduced the -j option for parallel processing, but
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+# this makes its output unreproducible.
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+# pahole 1.27 introduced --btf_features=+reproducible_build which
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+# makes the output reproducible even when -j is used.
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+# Assume that if KBUILD_BUILD_TIMESTAMP is set then a reproducible
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+# build is required and we must not use -j alone.
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+ifeq ($(KBUILD_BUILD_TIMESTAMP),)
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+pahole-flags-$(call test-ge, $(pahole-ver), 122) += -j
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+else
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+pahole-flags-$(call test-ge, $(pahole-ver), 127) += -j --btf_features=+reproducible_build
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+endif
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+
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pahole-flags-$(CONFIG_PAHOLE_HAS_LANG_EXCLUDE) += --lang_exclude=rust
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export PAHOLE_FLAGS := $(pahole-flags-y)
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