ftrace, ia64: explictly ignore a file in recordmcount.pl

In IA64, a function pointer isn't a 'unsigned long' but a
'struct {unsigned long ip, unsigned long gp}'. MCOUNT_ADDR is determined
at link time not compile time, so explictly ignore kernel/trace/ftrace.o
in recordmcount.pl.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

kernel/trace/ftrace.c

@@ -263,14 +263,6 @@ static void ftrace_update_pid_func(void)
 # error Dynamic ftrace depends on MCOUNT_RECORD
 #endif
 
-/*
- * Since MCOUNT_ADDR may point to mcount itself, we do not want
- * to get it confused by reading a reference in the code as we
- * are parsing on objcopy output of text. Use a variable for
- * it instead.
- */
-static unsigned long mcount_addr = MCOUNT_ADDR;
-
 enum {
 	FTRACE_ENABLE_CALLS		= (1 << 0),
 	FTRACE_DISABLE_CALLS		= (1 << 1),
@@ -575,7 +567,7 @@ ftrace_code_disable(struct module *mod, struct dyn_ftrace *rec)
 
 	ip = rec->ip;
 
-	ret = ftrace_make_nop(mod, rec, mcount_addr);
+	ret = ftrace_make_nop(mod, rec, MCOUNT_ADDR);
 	if (ret) {
 		ftrace_bug(ret, ip);
 		rec->flags |= FTRACE_FL_FAILED;

scripts/recordmcount.pl

@@ -109,6 +109,11 @@
 my ($arch, $bits, $objdump, $objcopy, $cc,
     $ld, $nm, $rm, $mv, $is_module, $inputfile) = @ARGV;
 
+# This file refers to mcount and shouldn't be ftraced, so lets' ignore it
+if ($inputfile eq "kernel/trace/ftrace.o") {
+    exit(0);
+}
+
 # Acceptable sections to record.
 my %text_sections = (
      ".text" => 1,