From: Hari Bathini <hbathini@linux.ibm.com>
To: linuxppc-dev <linuxppc-dev@lists.ozlabs.org>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>,
Christophe Leroy <christophe.leroy@csgroup.eu>,
"Naveen N. Rao" <naveen@kernel.org>,
Michael Ellerman <mpe@ellerman.id.au>,
linux-trace-kernel@vger.kernel.org,
Mark Rutland <mark.rutland@arm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
llvm@lists.linux.dev, Maryam Moghadas <maryammo@ca.ibm.com>
Subject: [PATCH 2/3] powerpc64/ftrace: fix OOL stub count with clang
Date: Sun, 9 Nov 2025 02:34:04 +0530 [thread overview]
Message-ID: <20251108210405.2375472-3-hbathini@linux.ibm.com> (raw)
In-Reply-To: <20251108210405.2375472-1-hbathini@linux.ibm.com>
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
next prev parent reply other threads:[~2025-11-08 21:04 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-08 21:04 [PATCH 0/3] powerpc64/ftrace: fixes clang build issues Hari Bathini
2025-11-08 21:04 ` [PATCH 1/3] powerpc64: make clang cross-build friendly Hari Bathini
2025-11-24 5:49 ` Naveen N Rao
2025-12-08 16:02 ` Hari Bathini
2026-01-09 13:50 ` Naveen N Rao
2025-11-08 21:04 ` Hari Bathini [this message]
2025-11-08 21:04 ` [PATCH 3/3] powerpc64/ftrace: workaround clang recording GEP in __patchable_function_entries Hari Bathini
2025-11-24 5:55 ` Naveen N Rao
2025-12-08 16:08 ` Hari Bathini
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