[PATCH 2/3] powerpc64/ftrace: fix OOL stub count with clang
From: Hari Bathini <hbathini@linux.ibm.com>
Date: 2025-11-08 21:04:53
Also in:
linux-trace-kernel, llvm
Subsystem:
function hooks (ftrace), linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Steven Rostedt, Masami Hiramatsu, Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
The total number of out-of-line (OOL) stubs required for function
tracing is determined using the following command:
$(OBJDUMP) -r -j __patchable_function_entries vmlinux.o
While this works correctly with GNU objdump, llvm-objdump does not
list the expected relocation records for this section. Fix this by
using the -d option and counting R_PPC64_ADDR64 relocation entries.
This works as desired with both objdump and llvm-objdump.
Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
---
arch/powerpc/tools/ftrace-gen-ool-stubs.sh | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/tools/ftrace-gen-ool-stubs.sh b/arch/powerpc/tools/ftrace-gen-ool-stubs.sh
index bac186bdf64a..9218d43aeb54 100755
--- a/arch/powerpc/tools/ftrace-gen-ool-stubs.sh
+++ b/arch/powerpc/tools/ftrace-gen-ool-stubs.sh@@ -15,9 +15,9 @@ if [ -z "$is_64bit" ]; then RELOCATION=R_PPC_ADDR32 fi -num_ool_stubs_total=$($objdump -r -j __patchable_function_entries "$vmlinux_o" | +num_ool_stubs_total=$($objdump -r -j __patchable_function_entries -d "$vmlinux_o" | grep -c "$RELOCATION") -num_ool_stubs_inittext=$($objdump -r -j __patchable_function_entries "$vmlinux_o" | +num_ool_stubs_inittext=$($objdump -r -j __patchable_function_entries -d "$vmlinux_o" | grep -e ".init.text" -e ".text.startup" | grep -c "$RELOCATION") num_ool_stubs_text=$((num_ool_stubs_total - num_ool_stubs_inittext))
--
2.51.1