diff mbox series

[v2,bpf-next,08/13] kbuild, bpf: add module-specific pahole/resolve_btfids flags for distilled base BTF

Message ID 20240424154806.3417662-9-alan.maguire@oracle.com (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series bpf: support resilient split BTF | expand

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netdev/series_format success Posting correctly formatted
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netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 8 this patch: 8
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers warning 2 maintainers not CCed: linux-kbuild@vger.kernel.org nicolas@fjasle.eu
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netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
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netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 21 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
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bpf/vmtest-bpf-next-VM_Test-32 fail Logs for x86_64-llvm-17 / test (test_progs_no_alu32, false, 360) / test_progs_no_alu32 on x86_64 with llvm-17
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Commit Message

Alan Maguire April 24, 2024, 3:48 p.m. UTC 
Support creation of module BTF along with distilled base BTF;
the latter is stored in a .BTF.base ELF section and supplements
split BTF references to base BTF with information about base types,
allowing for later relocation of split BTF with a (possibly
changed) base.  resolve_btfids uses the "-B" option to specify
that the BTF.ids section should be populated with split BTF
relative to the added .BTF.base section rather than relative
to the vmlinux base.

Modules will be built with a distilled .BTF.base section for external
module build, i.e.

make -C. -M=path2/module

...while in-tree module build as part of a normal kernel build will
not generate distilled base BTF; this is because in-tree modules
change with the kernel and do not require BTF relocation for the
running vmlinux.

Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
---
 scripts/Makefile.btf      | 7 +++++++
 scripts/Makefile.modfinal | 4 ++--
 2 files changed, 9 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/scripts/Makefile.btf b/scripts/Makefile.btf
index 8e6a9d4b492e..8a3f45813c1e 100644
--- a/scripts/Makefile.btf
+++ b/scripts/Makefile.btf
@@ -19,4 +19,11 @@  pahole-flags-$(call test-ge, $(pahole-ver), 126)	= -j --btf_features=encode_forc
 
 pahole-flags-$(CONFIG_PAHOLE_HAS_LANG_EXCLUDE)		+= --lang_exclude=rust
 
+ifneq ($(KBUILD_EXTMOD),)
+module-pahole-flags-$(call test-ge, $(pahole-ver), 126)	+= --btf_features=distilled_base
+module-resolve-btfids-flags-$(call test-ge, $(pahole-ver), 126) = -B
+endif
+
 export PAHOLE_FLAGS := $(pahole-flags-y)
+export MODULE_PAHOLE_FLAGS := $(module-pahole-flags-y)
+export MODULE_RESOLVE_BTFIDS_FLAGS := $(module-resolve-btfids-flags-y)
diff --git a/scripts/Makefile.modfinal b/scripts/Makefile.modfinal
index 8568d256d6fb..22f5bb0a60a6 100644
--- a/scripts/Makefile.modfinal
+++ b/scripts/Makefile.modfinal
@@ -39,8 +39,8 @@  quiet_cmd_btf_ko = BTF [M] $@
 	if [ ! -f vmlinux ]; then					\
 		printf "Skipping BTF generation for %s due to unavailability of vmlinux\n" $@ 1>&2; \
 	else								\
-		LLVM_OBJCOPY="$(OBJCOPY)" $(PAHOLE) -J $(PAHOLE_FLAGS) --btf_base vmlinux $@; \
-		$(RESOLVE_BTFIDS) -b vmlinux $@; 			\
+		LLVM_OBJCOPY="$(OBJCOPY)" $(PAHOLE) -J $(PAHOLE_FLAGS) $(MODULE_PAHOLE_FLAGS) --btf_base vmlinux $@; \
+		$(RESOLVE_BTFIDS) $(MODULE_RESOLVE_BTFIDS_FLAGS) -b vmlinux $@; 			\
 	fi;
 
 # Same as newer-prereqs, but allows to exclude specified extra dependencies