linux: pahole flags moved to scripts/Makefile.btf

pahole: added a revamped patch to remove the parallel implementation
kernel: use pahole 1.27 feature of reproducible builds

sdk_container/src/third_party/coreos-overlay/sys-kernel/coreos-sources/coreos-sources-6.12.20.ebuild

@@ -36,7 +36,7 @@ IUSE=""
 # local patches overlap with the upstream patch.
 UNIPATCH_LIST="
 	${PATCH_DIR}/z0001-kbuild-derive-relative-path-for-srctree-from-CURDIR.patch \
-	${PATCH_DIR}/z0002-revert-pahole-flags.patch \
+	${PATCH_DIR}/z0002-pahole-support-reproducible-builds.patch \
 	${PATCH_DIR}/z0003-Revert-x86-boot-Remove-the-bugger-off-message.patch \
 	${PATCH_DIR}/z0004-efi-add-an-efi_secure_boot-flag-to-indicate-secure-b.patch \
 	${PATCH_DIR}/z0005-efi-lock-down-the-kernel-if-booted-in-secure-boot-mo.patch \

sdk_container/src/third_party/coreos-overlay/sys-kernel/coreos-sources/files/6.12/z0002-pahole-support-reproducible-builds.patch

@@ -0,0 +1,26 @@
+From 9faff3734e6456e7927c0914829a4764ec9f1b44 Mon Sep 17 00:00:00 2001
+From: Adrian Vladu <avladu@cloudbasesolutions.com>
+Date: Tue, 17 Sep 2024 13:44:14 +0000
+Subject: [PATCH] pahole: support reproducible builds
+
+---
+ scripts/Makefile.btf | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/scripts/Makefile.btf b/scripts/Makefile.btf
+index 2d6e5ed9081e..b2f88b0fcf37 100644
+--- a/scripts/Makefile.btf
++++ b/scripts/Makefile.btf
+@@ -23,6 +23,9 @@ else
+ # Switch to using --btf_features for v1.26 and later.
+ pahole-flags-$(call test-ge, $(pahole-ver), 126)  = -j --btf_features=encode_force,var,float,enum64,decl_tag,type_tag,optimized_func,consistent_func
+ 
++# Support reproducible builds.
++pahole-flags-$(call test-ge, $(pahole-ver), 127)  = -j --btf_features=encode_force,var,float,enum64,decl_tag,type_tag,optimized_func,consistent_func,reproducible_build
++
+ endif
+ 
+ pahole-flags-$(CONFIG_PAHOLE_HAS_LANG_EXCLUDE)		+= --lang_exclude=rust
+-- 
+2.34.1
+

sdk_container/src/third_party/coreos-overlay/sys-kernel/coreos-sources/files/6.12/z0002-revert-pahole-flags.patch

@@ -1,53 +0,0 @@
-diff --git a/init/Kconfig b/init/Kconfig
-index e173364abd6c..cdc35682e03b 100644
---- a/init/Kconfig
-+++ b/init/Kconfig
-@@ -1899,7 +1899,7 @@ config RUST
- 	depends on !GCC_PLUGINS
- 	depends on !RANDSTRUCT
- 	depends on !SHADOW_CALL_STACK
--	depends on !DEBUG_INFO_BTF || (PAHOLE_HAS_LANG_EXCLUDE && !LTO)
-+	depends on !DEBUG_INFO_BTF
- 	help
- 	  Enables Rust support in the kernel.
- 
-diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
-index da5513cfc125..f2b3aab6d4a1 100644
---- a/lib/Kconfig.debug
-+++ b/lib/Kconfig.debug
-@@ -394,15 +394,6 @@ config PAHOLE_HAS_BTF_TAG
- 	  btf_decl_tag) or not. Currently only clang compiler implements
- 	  these attributes, so make the config depend on CC_IS_CLANG.
- 
--config PAHOLE_HAS_LANG_EXCLUDE
--	def_bool PAHOLE_VERSION >= 124
--	help
--	  Support for the --lang_exclude flag which makes pahole exclude
--	  compilation units from the supplied language. Used in Kbuild to
--	  omit Rust CUs which are not supported in version 1.24 of pahole,
--	  otherwise it would emit malformed kernel and module binaries when
--	  using DEBUG_INFO_BTF_MODULES.
--
- config DEBUG_INFO_BTF_MODULES
- 	bool "Generate BTF type information for kernel modules"
- 	default y
-diff --git a/scripts/pahole-flags.sh b/scripts/pahole-flags.sh
-index 728d55190d97..c293941612e7 100755
---- a/scripts/pahole-flags.sh
-+++ b/scripts/pahole-flags.sh
-@@ -16,15 +16,5 @@ fi
- if [ "${pahole_ver}" -ge "121" ]; then
- 	extra_paholeopt="${extra_paholeopt} --btf_gen_floats"
- fi
--if [ "${pahole_ver}" -ge "122" ]; then
--	extra_paholeopt="${extra_paholeopt} -j"
--fi
--if [ "${pahole_ver}" -ge "124" ]; then
--	# see PAHOLE_HAS_LANG_EXCLUDE
--	extra_paholeopt="${extra_paholeopt} --lang_exclude=rust"
--fi
--if [ "${pahole_ver}" -ge "125" ]; then
--	extra_paholeopt="${extra_paholeopt} --skip_encoding_btf_inconsistent_proto --btf_gen_optimized"
--fi
- 
- echo ${extra_paholeopt}