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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>
This commit is contained in:
Li Hong 2009-10-28 13:04:21 +08:00 committed by Steven Rostedt
parent bdd3b052c6
commit 7b7edc2768
1 changed files with 27 additions and 29 deletions
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56
scripts/recordmcount.pl
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@ -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;