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From:   Josh Poimboeuf <jpoimboe@redhat.com>
To:     Steven Rostedt <rostedt@goodmis.org>
Cc:     linux-kernel@vger.kernel.org,
        Peter Zijlstra <peterz@infradead.org>,
        Randy Dunlap <rdunlap@infradead.org>
Subject: [PATCH] samples/ftrace: Fix asm function ELF annotations
Date:   Fri, 24 Apr 2020 15:49:30 -0500
Message-Id: <86c1cbca67cb353da9f335643ef5fd19bd82988f.1587761369.git.jpoimboe@redhat.com>
MIME-Version: 1.0
Content-Transfer-Encoding: quoted-printable
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Enable objtool coverage for the sample ftrace modules by adding ELF
annotations to the asm trampoline functions.

  samples/ftrace/ftrace-direct.o: warning: objtool: .text+0x0: unreachabl=
e instruction
  samples/ftrace/ftrace-direct-modify.o: warning: objtool: .text+0x0: unr=
eachable instruction
  samples/ftrace/ftrace-direct-too.o: warning: objtool: .text+0x0: unreac=
hable instruction

Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
---
 samples/ftrace/ftrace-direct-modify.c | 4 ++++
 samples/ftrace/ftrace-direct-too.c    | 2 ++
 samples/ftrace/ftrace-direct.c        | 2 ++
 3 files changed, 8 insertions(+)

diff --git a/samples/ftrace/ftrace-direct-modify.c b/samples/ftrace/ftrac=
e-direct-modify.c
index e04229d21475..c13a5bc5095b 100644
--- a/samples/ftrace/ftrace-direct-modify.c
+++ b/samples/ftrace/ftrace-direct-modify.c
@@ -20,18 +20,22 @@ static unsigned long my_ip =3D (unsigned long)schedul=
e;
=20
 asm (
 "	.pushsection    .text, \"ax\", @progbits\n"
+"	.type		my_tramp1, @function\n"
 "   my_tramp1:"
 "	pushq %rbp\n"
 "	movq %rsp, %rbp\n"
 "	call my_direct_func1\n"
 "	leave\n"
+"	.size		my_tramp1, .-my_tramp1\n"
 "	ret\n"
+"	.type		my_tramp2, @function\n"
 "   my_tramp2:"
 "	pushq %rbp\n"
 "	movq %rsp, %rbp\n"
 "	call my_direct_func2\n"
 "	leave\n"
 "	ret\n"
+"	.size		my_tramp2, .-my_tramp2\n"
 "	.popsection\n"
 );
=20
diff --git a/samples/ftrace/ftrace-direct-too.c b/samples/ftrace/ftrace-d=
irect-too.c
index 27efa5f6ff52..d5c5022be664 100644
--- a/samples/ftrace/ftrace-direct-too.c
+++ b/samples/ftrace/ftrace-direct-too.c
@@ -15,6 +15,7 @@ extern void my_tramp(void *);
=20
 asm (
 "	.pushsection    .text, \"ax\", @progbits\n"
+"	.type		my_tramp, @function\n"
 "   my_tramp:"
 "	pushq %rbp\n"
 "	movq %rsp, %rbp\n"
@@ -27,6 +28,7 @@ asm (
 "	popq %rdi\n"
 "	leave\n"
 "	ret\n"
+"	.size		my_tramp, .-my_tramp\n"
 "	.popsection\n"
 );
=20
diff --git a/samples/ftrace/ftrace-direct.c b/samples/ftrace/ftrace-direc=
t.c
index a2e3063bd306..63ca06d42c80 100644
--- a/samples/ftrace/ftrace-direct.c
+++ b/samples/ftrace/ftrace-direct.c
@@ -13,6 +13,7 @@ extern void my_tramp(void *);
=20
 asm (
 "	.pushsection    .text, \"ax\", @progbits\n"
+"	.type		my_tramp, @function\n"
 "   my_tramp:"
 "	pushq %rbp\n"
 "	movq %rsp, %rbp\n"
@@ -21,6 +22,7 @@ asm (
 "	popq %rdi\n"
 "	leave\n"
 "	ret\n"
+"	.size		my_tramp, .-my_tramp\n"
 "	.popsection\n"
 );
=20
--=20
2.21.1