Commit db16c1fe authored by Ilya Leoshkevich's avatar Ilya Leoshkevich Committed by Andrii Nakryiko
Browse files

bpf: Generate BTF_KIND_FLOAT when linking vmlinux 

pahole v1.21 supports the --btf_gen_floats flag, which makes it
generate the information about the floating-point types [1].

Adjust link-vmlinux.sh to pass this flag to pahole in case it's
supported, which is determined using a simple version check.

[1] https://lore.kernel.org/dwarves/YHRiXNX1JUF2Az0A@kernel.org/



Signed-off-by: default avatarIlya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Acked-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210413190043.21918-1-iii@linux.ibm.com
parent 5c507329

scripts/link-vmlinux.sh

+6 −1
Original line number Diff line number Diff line
@@ -213,6 +213,7 @@ 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"
@@ -227,8 +228,12 @@ gen_btf() 


	vmlinux_link ${1}



	if [ "${pahole_ver}" -ge "121" ]; then

		extra_paholeopt="${extra_paholeopt} --btf_gen_floats"

	fi



	info "BTF" ${2}

	LLVM_OBJCOPY=${OBJCOPY} ${PAHOLE} -J ${1}

	LLVM_OBJCOPY=${OBJCOPY} ${PAHOLE} -J ${extra_paholeopt} ${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