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authorMasahiro Yamada <masahiroy@kernel.org>2024-06-10 13:25:17 +0200
committerMasahiro Yamada <masahiroy@kernel.org>2024-07-15 18:08:36 +0200
commitc442db3f49f27e5a60a641b2ac9a3c6320796ed6 (patch)
tree665aa0090b4e1c77ce6e2c2d1b89111c8a5a333e /scripts/link-vmlinux.sh
parentkbuild: refactor variables in scripts/link-vmlinux.sh (diff)
downloadlinux-c442db3f49f27e5a60a641b2ac9a3c6320796ed6.tar.xz
linux-c442db3f49f27e5a60a641b2ac9a3c6320796ed6.zip
kbuild: remove PROVIDE() for kallsyms symbols
This reimplements commit 951bcae6c5a0 ("kallsyms: Avoid weak references for kallsyms symbols") because I am not a big fan of PROVIDE(). As an alternative solution, this commit prepends one more kallsyms step. KSYMS .tmp_vmlinux.kallsyms0.S # added AS .tmp_vmlinux.kallsyms0.o # added LD .tmp_vmlinux.btf BTF .btf.vmlinux.bin.o LD .tmp_vmlinux.kallsyms1 NM .tmp_vmlinux.kallsyms1.syms KSYMS .tmp_vmlinux.kallsyms1.S AS .tmp_vmlinux.kallsyms1.o LD .tmp_vmlinux.kallsyms2 NM .tmp_vmlinux.kallsyms2.syms KSYMS .tmp_vmlinux.kallsyms2.S AS .tmp_vmlinux.kallsyms2.o LD vmlinux Step 0 takes /dev/null as input, and generates .tmp_vmlinux.kallsyms0.o, which has a valid kallsyms format with the empty symbol list, and can be linked to vmlinux. Since it is really small, the added compile-time cost is negligible. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Acked-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
Diffstat (limited to 'scripts/link-vmlinux.sh')
-rwxr-xr-xscripts/link-vmlinux.sh9
1 files changed, 7 insertions, 2 deletions
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index 3d9d7257143a..83d605ba7241 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -227,6 +227,10 @@ btf_vmlinux_bin_o=
kallsymso=
strip_debug=
+if is_enabled CONFIG_KALLSYMS; then
+ kallsyms /dev/null .tmp_vmlinux.kallsyms0
+fi
+
if is_enabled CONFIG_DEBUG_INFO_BTF; then
if ! gen_btf .tmp_vmlinux.btf .btf.vmlinux.bin.o ; then
echo >&2 "Failed to generate BTF for vmlinux"
@@ -239,9 +243,10 @@ if is_enabled CONFIG_KALLSYMS; then
# kallsyms support
# Generate section listing all symbols and add it into vmlinux
- # It's a three step process:
+ # It's a four step process:
+ # 0) Generate a dummy __kallsyms with empty symbol list.
# 1) Link .tmp_vmlinux.kallsyms1 so it has all symbols and sections,
- # but __kallsyms is empty.
+ # with a dummy __kallsyms.
# Running kallsyms on that gives us .tmp_kallsyms1.o with
# the right size
# 2) Link .tmp_vmlinux.kallsyms2 so it now has a __kallsyms section of