linux-kernel - [PATCH V2] tracing/recordmount.pl: use apropriate perl-constructs

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Date:	Tue,  5 Jan 2010 21:41:22 +0100
From:	Wolfram Sang <w.sang@...gutronix.de>
To:	linux-kernel@...r.kernel.org
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Wolfram Sang <w.sang@...gutronix.de>
Subject: [PATCH V2] tracing/recordmount.pl: use apropriate perl-constructs

...and add a comment where they are not wanted.

Signed-off-by: Wolfram Sang <w.sang@...gutronix.de>
---

Changes since V1:

* dropped the ||=-idiom and simplified the current code

Had to change the syntax for this block again, as "$cc == ''" produces warnings
with 'perl -w' (same for using 'eq'). I hope this version now is also readable
for C-hackers ;) Sorry for the noise here.

* removed the change for $print_warning

 scripts/recordmcount.pl |   29 +++++++++++------------------
 1 files changed, 11 insertions(+), 18 deletions(-)

diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl
index 5de12c7..90f2be2 100755
--- a/scripts/recordmcount.pl
+++ b/scripts/recordmcount.pl
@@ -136,13 +136,14 @@ my %text_sections = (
      ".text.unlikely" => 1,
 );
 
-$objdump = "objdump" if ((length $objdump) == 0);
-$objcopy = "objcopy" if ((length $objcopy) == 0);
-$cc = "gcc" if ((length $cc) == 0);
-$ld = "ld" if ((length $ld) == 0);
-$nm = "nm" if ((length $nm) == 0);
-$rm = "rm" if ((length $rm) == 0);
-$mv = "mv" if ((length $mv) == 0);
+# Note: we are nice to C-programmers here, thus we skip the '||='-idiom.
+$objdump = 'objdump' if (!$objdump);
+$objcopy = 'objcopy' if (!$objcopy);
+$cc = 'gcc' if (!$cc);
+$ld = 'ld' if (!$ld);
+$nm = 'nm' if (!$nm);
+$rm = 'rm' if (!$rm);
+$mv = 'mv' if (!$mv);
 
 #print STDERR "running: $P '$arch' '$objdump' '$objcopy' '$cc' '$ld' " .
 #    "'$nm' '$rm' '$mv' '$inputfile'\n";
@@ -194,12 +195,8 @@ sub check_objcopy
     }
 }
 
-if ($arch eq "x86") {
-    if ($bits == 64) {
-	$arch = "x86_64";
-    } else {
-	$arch = "i386";
-    }
+if ($arch eq 'x86') {
+    $arch = ($bits == 64) ? 'x86_64' : 'i386';
 }
 
 #
@@ -476,11 +473,7 @@ while (<IN>) {
 	$read_headers = 0;
 
 	# Only record text sections that we know are safe
-	if (defined($text_sections{$1})) {
-	    $read_function = 1;
-	} else {
-	    $read_function = 0;
-	}
+	$read_function = defined($text_sections{$1});
 	# print out any recorded offsets
 	update_funcs();
 
-- 
1.6.3.3

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