samples/ftrace: Fix asm function ELF annotations

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: unreachable instruction
  samples/ftrace/ftrace-direct-modify.o: warning: objtool: .text+0x0: unreachable instruction
  samples/ftrace/ftrace-direct-too.o: warning: objtool: .text+0x0: unreachable instruction

Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>

diff --git a/samples/ftrace/ftrace-direct-modify.c b/samples/ftrace/ftrace-direct-modify.c
index e04229d..c13a5bc 100644 (file)
--- a/samples/ftrace/ftrace-direct-modify.c
+++ b/samples/ftrace/ftrace-direct-modify.c
@@ -20,18 +20,22 @@ static unsigned long my_ip = (unsigned long)schedule;
 
 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"
 );
 

diff --git a/samples/ftrace/ftrace-direct-too.c b/samples/ftrace/ftrace-direct-too.c
index 27efa5f..d5c5022 100644 (file)
--- a/samples/ftrace/ftrace-direct-too.c
+++ b/samples/ftrace/ftrace-direct-too.c
@@ -15,6 +15,7 @@ extern void my_tramp(void *);
 
 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"
 );
 

diff --git a/samples/ftrace/ftrace-direct.c b/samples/ftrace/ftrace-direct.c
index a2e3063..63ca06d 100644 (file)
--- a/samples/ftrace/ftrace-direct.c
+++ b/samples/ftrace/ftrace-direct.c
@@ -13,6 +13,7 @@ extern void my_tramp(void *);
 
 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"
 );