From: Jiri Olsa jolsa@redhat.com
commit 9741e07ece7c247dd65e1aa01e16b683f01c05a8 upstream.
[skipped --btf_gen_floats option in pahole-flags.sh, skipped Makefile.modfinal change, because there's no BTF kmod support, squashing in 'exit 0' change from merge commit fc02cb2b37fe]
Using new PAHOLE_FLAGS variable to pass extra arguments to pahole for both vmlinux and modules BTF data generation.
Adding new scripts/pahole-flags.sh script that detect and prints pahole options.
[ fixed issues found by kernel test robot ]
Signed-off-by: Jiri Olsa jolsa@kernel.org Signed-off-by: Andrii Nakryiko andrii@kernel.org Acked-by: Andrii Nakryiko andrii@kernel.org Link: https://lore.kernel.org/bpf/20211029125729.70002-1-jolsa@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- Makefile | 3 +++ scripts/link-vmlinux.sh | 8 +------- scripts/pahole-flags.sh | 17 +++++++++++++++++ 3 files changed, 21 insertions(+), 7 deletions(-) create mode 100755 scripts/pahole-flags.sh
--- a/Makefile +++ b/Makefile @@ -465,6 +465,8 @@ LZ4 = lz4c XZ = xz ZSTD = zstd
+PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh) + CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) NOSTDINC_FLAGS := @@ -518,6 +520,7 @@ export KBUILD_CFLAGS CFLAGS_KERNEL CFLAG export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL +export PAHOLE_FLAGS
# Files to ignore in find ... statements
--- a/scripts/link-vmlinux.sh +++ b/scripts/link-vmlinux.sh @@ -146,7 +146,6 @@ vmlinux_link() gen_btf() { local pahole_ver - local extra_paholeopt=
if ! [ -x "$(command -v ${PAHOLE})" ]; then echo >&2 "BTF: ${1}: pahole (${PAHOLE}) is not available" @@ -161,13 +160,8 @@ gen_btf()
vmlinux_link ${1}
- if [ "${pahole_ver}" -ge "118" ] && [ "${pahole_ver}" -le "121" ]; then - # pahole 1.18 through 1.21 can't handle zero-sized per-CPU vars - extra_paholeopt="${extra_paholeopt} --skip_encoding_btf_vars" - fi - info "BTF" ${2} - LLVM_OBJCOPY="${OBJCOPY}" ${PAHOLE} -J ${extra_paholeopt} ${1} + LLVM_OBJCOPY="${OBJCOPY}" ${PAHOLE} -J ${PAHOLE_FLAGS} ${1}
# Create ${2} which contains just .BTF section but no symbols. Add # SHF_ALLOC because .BTF will be part of the vmlinux image. --strip-all --- /dev/null +++ b/scripts/pahole-flags.sh @@ -0,0 +1,17 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 + +extra_paholeopt= + +if ! [ -x "$(command -v ${PAHOLE})" ]; then + exit 0 +fi + +pahole_ver=$(${PAHOLE} --version | sed -E 's/v([0-9]+).([0-9]+)/\1\2/') + +if [ "${pahole_ver}" -ge "118" ] && [ "${pahole_ver}" -le "121" ]; then + # pahole 1.18 through 1.21 can't handle zero-sized per-CPU vars + extra_paholeopt="${extra_paholeopt} --skip_encoding_btf_vars" +fi + +echo ${extra_paholeopt}