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Subject[tip:tracing/core] tracing: Fix objcopy revision check in recordmcount.pl
Commit-ID:  7b7edc27683e20624f4daf17c76041719184201c
Gitweb: http://git.kernel.org/tip/7b7edc27683e20624f4daf17c76041719184201c
Author: Li Hong <lihong.hi@gmail.com>
AuthorDate: Wed, 28 Oct 2009 13:04:21 +0800
Committer: Steven Rostedt <rostedt@goodmis.org>
CommitDate: Thu, 29 Oct 2009 15:11:44 -0400

tracing: Fix objcopy revision check in recordmcount.pl

The current logic to check objcopy's version is incorrect. This patch
fixes the algorithm and disables the use of local functions as a reference
if the objcopy version does not support static to global conversions.

Also remove some usused variables.

Signed-off-by: Li Hong <lihong.hi@gmail.com>
LKML-Reference: <20091028050421.GD30758@uhli>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
scripts/recordmcount.pl | 56 ++++++++++++++++++++++------------------------
1 files changed, 27 insertions(+), 29 deletions(-)
diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl
index b80e5d0..d6199fc 100755
--- a/scripts/recordmcount.pl
+++ b/scripts/recordmcount.pl
@@ -159,6 +159,31 @@ my $function_regex; # Find the name of a function
my $mcount_regex; # Find the call site to mcount (return offset)
my $alignment; # The .align value to use for $mcount_section
my $section_type; # Section header plus possible alignment command
+my $can_use_local = 0; # If we can use local function references
+
+##
+# check_objcopy - whether objcopy supports --globalize-symbols
+#
+# --globalize-symbols came out in 2.17, we must test the version
+# of objcopy, and if it is less than 2.17, then we can not
+# record local functions.
+sub check_objcopy
+{
+ open (IN, "$objcopy --version |") or die "error running $objcopy";
+ while (<IN>) {
+ if (/objcopy.*\s(\d+)\.(\d+)/) {
+ $can_use_local = 1 if ($1 > 2 || ($1 == 2 && $2 >= 17));
+ last;
+ }
+ }
+ close (IN);
+
+ if (!$can_use_local) {
+ print STDERR "WARNING: could not find objcopy version or version " .
+ "is less than 2.17.\n" .
+ "\tLocal function references is disabled.\n";
+ }
+}

if ($arch eq "x86") {
if ($bits == 64) {
@@ -293,34 +318,7 @@ if ($filename =~ m,^(.*)(\.\S),) {
my $mcount_s = $dirname . "/.tmp_mc_" . $prefix . ".s";
my $mcount_o = $dirname . "/.tmp_mc_" . $prefix . ".o";

-#
-# --globalize-symbols came out in 2.17, we must test the version
-# of objcopy, and if it is less than 2.17, then we can not
-# record local functions.
-my $use_locals = 01;
-my $local_warn_once = 0;
-my $found_version = 0;
-
-open (IN, "$objcopy --version |") || die "error running $objcopy";
-while (<IN>) {
- if (/objcopy.*\s(\d+)\.(\d+)/) {
- my $major = $1;
- my $minor = $2;
-
- $found_version = 1;
- if ($major < 2 ||
- ($major == 2 && $minor < 17)) {
- $use_locals = 0;
- }
- last;
- }
-}
-close (IN);
-
-if (!$found_version) {
- print STDERR "WARNING: could not find objcopy version.\n" .
- "\tDisabling local function references.\n";
-}
+check_objcopy();

#
# Step 1: find all the local (static functions) and weak symbols.
@@ -367,7 +365,7 @@ sub update_funcs
if (defined $locals{$ref_func}) {

# only use locals if objcopy supports globalize-symbols
- if (!$use_locals) {
+ if (!$can_use_local) {
return;
}
$convert{$ref_func} = 1;

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