[PATCH 1/3] Replace use of perl in 2.6.30 build

[PATCH 1/3] Replace use of perl in 2.6.30 build

[Rob Landley]

From: Rob Landley <rob@landley.net>

Replace kernel/timeconst.pl with kernel/timeconst.sh.  The new shell script
is much simpler, about 1/4 the size, and runs on Red Hat 9 from 2003.

It requires a shell which can do 64 bit math, such as bash, busybox ash,
or dash.

Signed-off-by: Rob Landley <rob@landley.net>
---

Changes from previous version (http://lkml.org/lkml/2009/1/3/218):

Cosmetic tweak to millisecond/microsecond loop to pipe a here document into
"while read".  (Previous version had a for loop parsing arguments with spaces
via "cut", which prompted much bikeshedding.)

 kernel/Makefile     |    4 
 kernel/timeconst.pl |  378 ------------------------------------------
 kernel/timeconst.sh |  148 ++++++++++++++++
 3 files changed, 150 insertions(+), 380 deletions(-)

diff -ruN linux-2.6.30/kernel/Makefile linux-2.6.30.new/kernel/Makefile
--- linux-2.6.30/kernel/Makefile	2009-06-09 22:05:27.000000000 -0500
+++ linux-2.6.30.new/kernel/Makefile	2009-06-22 14:29:16.000000000 -0500
@@ -122,7 +122,7 @@
 $(obj)/time.o: $(obj)/timeconst.h
 
 quiet_cmd_timeconst  = TIMEC   $@
-      cmd_timeconst  = $(PERL) $< $(CONFIG_HZ) > $@
+      cmd_timeconst  = $(CONFIG_SHELL) $< $(CONFIG_HZ) $@
 targets += timeconst.h
-$(obj)/timeconst.h: $(src)/timeconst.pl FORCE
+$(obj)/timeconst.h: $(src)/timeconst.sh FORCE
 	$(call if_changed,timeconst)
diff -ruN linux-2.6.30/kernel/timeconst.pl linux-2.6.30.new/kernel/timeconst.pl
--- linux-2.6.30/kernel/timeconst.pl	2009-06-09 22:05:27.000000000 -0500
+++ linux-2.6.30.new/kernel/timeconst.pl	1969-12-31 18:00:00.000000000 -0600
@@ -1,378 +0,0 @@
-#!/usr/bin/perl
-# -----------------------------------------------------------------------
-#
-#   Copyright 2007-2008 rPath, Inc. - All Rights Reserved
-#
-#   This file is part of the Linux kernel, and is made available under
-#   the terms of the GNU General Public License version 2 or (at your
-#   option) any later version; incorporated herein by reference.
-#
-# -----------------------------------------------------------------------
-#
-
-#
-# Usage: timeconst.pl HZ > timeconst.h
-#
-
-# Precomputed values for systems without Math::BigInt
-# Generated by:
-# timeconst.pl --can 24 32 48 64 100 122 128 200 250 256 300 512 1000 1024 1200
-%canned_values = (
-	24 => [
-		'0xa6aaaaab','0x2aaaaaa',26,
-		125,3,
-		'0xc49ba5e4','0x1fbe76c8b4',37,
-		3,125,
-		'0xa2c2aaab','0xaaaa',16,
-		125000,3,
-		'0xc9539b89','0x7fffbce4217d',47,
-		3,125000,
-	], 32 => [
-		'0xfa000000','0x6000000',27,
-		125,4,
-		'0x83126e98','0xfdf3b645a',36,
-		4,125,
-		'0xf4240000','0x0',17,
-		31250,1,
-		'0x8637bd06','0x3fff79c842fa',46,
-		1,31250,
-	], 48 => [
-		'0xa6aaaaab','0x6aaaaaa',27,
-		125,6,
-		'0xc49ba5e4','0xfdf3b645a',36,
-		6,125,
-		'0xa2c2aaab','0x15555',17,
-		62500,3,
-		'0xc9539b89','0x3fffbce4217d',46,
-		3,62500,
-	], 64 => [
-		'0xfa000000','0xe000000',28,
-		125,8,
-		'0x83126e98','0x7ef9db22d',35,
-		8,125,
-		'0xf4240000','0x0',18,
-		15625,1,
-		'0x8637bd06','0x1fff79c842fa',45,
-		1,15625,
-	], 100 => [
-		'0xa0000000','0x0',28,
-		10,1,
-		'0xcccccccd','0x733333333',35,
-		1,10,
-		'0x9c400000','0x0',18,
-		10000,1,
-		'0xd1b71759','0x1fff2e48e8a7',45,
-		1,10000,
-	], 122 => [
-		'0x8325c53f','0xfbcda3a',28,
-		500,61,
-		'0xf9db22d1','0x7fbe76c8b',35,
-		61,500,
-		'0x8012e2a0','0x3ef36',18,
-		500000,61,
-		'0xffda4053','0x1ffffbce4217',45,
-		61,500000,
-	], 128 => [
-		'0xfa000000','0x1e000000',29,
-		125,16,
-		'0x83126e98','0x3f7ced916',34,
-		16,125,
-		'0xf4240000','0x40000',19,
-		15625,2,
-		'0x8637bd06','0xfffbce4217d',44,
-		2,15625,
-	], 200 => [
-		'0xa0000000','0x0',29,
-		5,1,
-		'0xcccccccd','0x333333333',34,
-		1,5,
-		'0x9c400000','0x0',19,
-		5000,1,
-		'0xd1b71759','0xfff2e48e8a7',44,
-		1,5000,
-	], 250 => [
-		'0x80000000','0x0',29,
-		4,1,
-		'0x80000000','0x180000000',33,
-		1,4,
-		'0xfa000000','0x0',20,
-		4000,1,
-		'0x83126e98','0x7ff7ced9168',43,
-		1,4000,
-	], 256 => [
-		'0xfa000000','0x3e000000',30,
-		125,32,
-		'0x83126e98','0x1fbe76c8b',33,
-		32,125,
-		'0xf4240000','0xc0000',20,
-		15625,4,
-		'0x8637bd06','0x7ffde7210be',43,
-		4,15625,
-	], 300 => [
-		'0xd5555556','0x2aaaaaaa',30,
-		10,3,
-		'0x9999999a','0x1cccccccc',33,
-		3,10,
-		'0xd0555556','0xaaaaa',20,
-		10000,3,
-		'0x9d495183','0x7ffcb923a29',43,
-		3,10000,
-	], 512 => [
-		'0xfa000000','0x7e000000',31,
-		125,64,
-		'0x83126e98','0xfdf3b645',32,
-		64,125,
-		'0xf4240000','0x1c0000',21,
-		15625,8,
-		'0x8637bd06','0x3ffef39085f',42,
-		8,15625,
-	], 1000 => [
-		'0x80000000','0x0',31,
-		1,1,
-		'0x80000000','0x0',31,
-		1,1,
-		'0xfa000000','0x0',22,
-		1000,1,
-		'0x83126e98','0x1ff7ced9168',41,
-		1,1000,
-	], 1024 => [
-		'0xfa000000','0xfe000000',32,
-		125,128,
-		'0x83126e98','0x7ef9db22',31,
-		128,125,
-		'0xf4240000','0x3c0000',22,
-		15625,16,
-		'0x8637bd06','0x1fff79c842f',41,
-		16,15625,
-	], 1200 => [
-		'0xd5555556','0xd5555555',32,
-		5,6,
-		'0x9999999a','0x66666666',31,
-		6,5,
-		'0xd0555556','0x2aaaaa',22,
-		2500,3,
-		'0x9d495183','0x1ffcb923a29',41,
-		3,2500,
-	]
-);
-
-$has_bigint = eval 'use Math::BigInt qw(bgcd); 1;';
-
-sub bint($)
-{
-	my($x) = @_;
-	return Math::BigInt->new($x);
-}
-
-#
-# Constants for division by reciprocal multiplication.
-# (bits, numerator, denominator)
-#
-sub fmul($$$)
-{
-	my ($b,$n,$d) = @_;
-
-	$n = bint($n);
-	$d = bint($d);
-
-	return scalar (($n << $b)+$d-bint(1))/$d;
-}
-
-sub fadj($$$)
-{
-	my($b,$n,$d) = @_;
-
-	$n = bint($n);
-	$d = bint($d);
-
-	$d = $d/bgcd($n, $d);
-	return scalar (($d-bint(1)) << $b)/$d;
-}
-
-sub fmuls($$$) {
-	my($b,$n,$d) = @_;
-	my($s,$m);
-	my($thres) = bint(1) << ($b-1);
-
-	$n = bint($n);
-	$d = bint($d);
-
-	for ($s = 0; 1; $s++) {
-		$m = fmul($s,$n,$d);
-		return $s if ($m >= $thres);
-	}
-	return 0;
-}
-
-# Generate a hex value if the result fits in 64 bits;
-# otherwise skip.
-sub bignum_hex($) {
-	my($x) = @_;
-	my $s = $x->as_hex();
-
-	return (length($s) > 18) ? undef : $s;
-}
-
-# Provides mul, adj, and shr factors for a specific
-# (bit, time, hz) combination
-sub muladj($$$) {
-	my($b, $t, $hz) = @_;
-	my $s = fmuls($b, $t, $hz);
-	my $m = fmul($s, $t, $hz);
-	my $a = fadj($s, $t, $hz);
-	return (bignum_hex($m), bignum_hex($a), $s);
-}
-
-# Provides numerator, denominator values
-sub numden($$) {
-	my($n, $d) = @_;
-	my $g = bgcd($n, $d);
-	return ($n/$g, $d/$g);
-}
-
-# All values for a specific (time, hz) combo
-sub conversions($$) {
-	my ($t, $hz) = @_;
-	my @val = ();
-
-	# HZ_TO_xx
-	push(@val, muladj(32, $t, $hz));
-	push(@val, numden($t, $hz));
-
-	# xx_TO_HZ
-	push(@val, muladj(32, $hz, $t));
-	push(@val, numden($hz, $t));
-
-	return @val;
-}
-
-sub compute_values($) {
-	my($hz) = @_;
-	my @val = ();
-	my $s, $m, $a, $g;
-
-	if (!$has_bigint) {
-		die "$0: HZ == $hz not canned and ".
-		    "Math::BigInt not available\n";
-	}
-
-	# MSEC conversions
-	push(@val, conversions(1000, $hz));
-
-	# USEC conversions
-	push(@val, conversions(1000000, $hz));
-
-	return @val;
-}
-
-sub outputval($$)
-{
-	my($name, $val) = @_;
-	my $csuf;
-
-	if (defined($val)) {
-	    if ($name !~ /SHR/) {
-		$val = "U64_C($val)";
-	    }
-	    printf "#define %-23s %s\n", $name.$csuf, $val.$csuf;
-	}
-}
-
-sub output($@)
-{
-	my($hz, @val) = @_;
-	my $pfx, $bit, $suf, $s, $m, $a;
-
-	print "/* Automatically generated by kernel/timeconst.pl */\n";
-	print "/* Conversion constants for HZ == $hz */\n";
-	print "\n";
-	print "#ifndef KERNEL_TIMECONST_H\n";
-	print "#define KERNEL_TIMECONST_H\n";
-	print "\n";
-
-	print "#include <linux/param.h>\n";
-	print "#include <linux/types.h>\n";
-
-	print "\n";
-	print "#if HZ != $hz\n";
-	print "#error \"kernel/timeconst.h has the wrong HZ value!\"\n";
-	print "#endif\n";
-	print "\n";
-
-	foreach $pfx ('HZ_TO_MSEC','MSEC_TO_HZ',
-		      'HZ_TO_USEC','USEC_TO_HZ') {
-		foreach $bit (32) {
-			foreach $suf ('MUL', 'ADJ', 'SHR') {
-				outputval("${pfx}_$suf$bit", shift(@val));
-			}
-		}
-		foreach $suf ('NUM', 'DEN') {
-			outputval("${pfx}_$suf", shift(@val));
-		}
-	}
-
-	print "\n";
-	print "#endif /* KERNEL_TIMECONST_H */\n";
-}
-
-# Pretty-print Perl values
-sub perlvals(@) {
-	my $v;
-	my @l = ();
-
-	foreach $v (@_) {
-		if (!defined($v)) {
-			push(@l, 'undef');
-		} elsif ($v =~ /^0x/) {
-			push(@l, "\'".$v."\'");
-		} else {
-			push(@l, $v.'');
-		}
-	}
-	return join(',', @l);
-}
-
-($hz) = @ARGV;
-
-# Use this to generate the %canned_values structure
-if ($hz eq '--can') {
-	shift(@ARGV);
-	@hzlist = sort {$a <=> $b} (@ARGV);
-
-	print "# Precomputed values for systems without Math::BigInt\n";
-	print "# Generated by:\n";
-	print "# timeconst.pl --can ", join(' ', @hzlist), "\n";
-	print "\%canned_values = (\n";
-	my $pf = "\t";
-	foreach $hz (@hzlist) {
-		my @values = compute_values($hz);
-		print "$pf$hz => [\n";
-		while (scalar(@values)) {
-			my $bit;
-			foreach $bit (32) {
-				my $m = shift(@values);
-				my $a = shift(@values);
-				my $s = shift(@values);
-				print "\t\t", perlvals($m,$a,$s), ",\n";
-			}
-			my $n = shift(@values);
-			my $d = shift(@values);
-			print "\t\t", perlvals($n,$d), ",\n";
-		}
-		print "\t]";
-		$pf = ', ';
-	}
-	print "\n);\n";
-} else {
-	$hz += 0;			# Force to number
-	if ($hz < 1) {
-		die "Usage: $0 HZ\n";
-	}
-
-	@val = @{$canned_values{$hz}};
-	if (!defined(@val)) {
-		@val = compute_values($hz);
-	}
-	output($hz, @val);
-}
-exit 0;
diff -ruN linux-2.6.30/kernel/timeconst.sh linux-2.6.30.new/kernel/timeconst.sh
--- linux-2.6.30/kernel/timeconst.sh	1969-12-31 18:00:00.000000000 -0600
+++ linux-2.6.30.new/kernel/timeconst.sh	2009-06-22 14:29:16.000000000 -0500
@@ -0,0 +1,148 @@
+#!/bin/sh
+
+if [ $# -ne 2 ]
+then
+	echo "Usage: timeconst.sh HZ FILENAME"
+	echo
+	echo "Generate a header file with constants for coverting between"
+	echo "decimal HZ timer ticks and milisecond or microsecond delays."
+	echo
+	exit 1
+fi
+
+HZ=$1
+shift
+FILENAME=$1
+
+# Sanity test: even the shell in Red Hat 9 (circa 2003) supported 64 bit math.
+
+if [ $((1 << 32)) -lt 0 ]
+then
+	echo "timeconst.sh needs a shell with 64 bit math, such as bash,"
+	echo "busybox ash, or dash running on a 64 bit host."
+	exit 1
+fi
+
+# If this script exits for any reason before this trap is removed,
+# delete the output file so a partial file won't confuse the build.
+
+trap "rm $FILENAME" EXIT
+
+# Output start of header file
+
+cat > $FILENAME << EOF || exit 1
+/* Automatically generated by kernel/timeconst.sh */
+/* Conversion constants for HZ == $HZ */
+
+#ifndef __KERNEL_TIMECONST_H
+#define __KERNEL_TIMECONST_H
+
+#include <linux/param.h>
+#include <linux/types.h>
+
+#if HZ != $HZ
+#error "kernel/timeconst.h has the wrong HZ value!"
+#endif
+
+EOF
+
+# For both Milliseconds and Microseconds
+
+cat << EOF |
+MSEC 1000
+USEC 1000000
+EOF
+while read NAME PERIOD
+do
+	# Find greatest common denominator (using Euclid's algorithm)
+
+	A=$HZ
+	B=$PERIOD
+
+	while [ $B -ne 0 ]
+	do
+		C=$(( $A % $B ))
+		A=$B
+		B=$C
+	done
+
+	GCD=$A
+
+	# Do this for each direction (HZ_TO_PERIOD and PERIOD_TO_HZ)
+
+	for DIRECTION in 0 1
+	do
+		if [ $DIRECTION -eq 0 ]
+		then
+			CONVERT="HZ_TO_${NAME}"
+			FROM=$HZ
+			TO=$PERIOD
+		else
+			CONVERT="${NAME}_TO_HZ"
+			FROM=$PERIOD
+			TO=$HZ
+		fi
+
+		# Calculate 32 significant bits of MUL32 data.
+
+		SHIFT=0
+		while true
+		do
+			# This can't overflow 64 bit math.  Pathological case
+			# (TO=1, FROM=1000000) uses around 32+20=52 bits.
+
+			MUL32=$(( ( ( $TO << $SHIFT ) + $FROM - 1 ) / $FROM ))
+
+			# Keep increasing $SHIFT until we've got 32 bits.
+
+			[ $MUL32 -gt $(( 1 << 31 )) ] && break
+			SHIFT=$(( $SHIFT + 1 ))
+		done
+		MUL32=$( printf %x $MUL32 )
+
+		# ADJ32 is just (((FROM/GCD)-1)<<SHIFT)/(FROM/GCD) but this
+		# can overflow 64 bit math (examples, HZ=24 or HZ=122).
+		# Pathological case could use 32+20+20=72 bits.  (And this is
+		# the pathological case because a larger $HZ results in a
+		# smaller $SHIFT, so even insane HZ>USEC cases should be ok.)
+
+		# To get around this, we chop the bottom 32 bits off the
+		# calculation and then reassemble it to avoid overflow:
+		# 32+64=96, which is > 72.
+
+		ADJ32=$(( $FROM / $GCD ))
+		if [ $SHIFT -gt 32 ]
+		then
+			UPPER=$(( ( $ADJ32 - 1 ) << ( $SHIFT - 32 ) ))
+			LOWER=$(( ( $UPPER % $ADJ32 ) << 32 ))
+			ADJ32=$(( ( ( $UPPER / $ADJ32 ) << 32 ) + ( $LOWER / $ADJ32 )))
+		else
+			ADJ32=$(( ( ( $ADJ32 - 1 ) << $SHIFT) / $ADJ32 ))
+		fi
+		ADJ32=$( printf %x $ADJ32 )
+
+		NUM=$(( $TO / $GCD ))
+		DEN=$(( $FROM / $GCD ))
+
+		# Output next chunk of header data to file
+
+		(
+			echo "#define ${CONVERT}_MUL32	U64_C(0x$MUL32)" &&
+			echo "#define ${CONVERT}_ADJ32	U64_C(0x$ADJ32)" &&
+			echo "#define ${CONVERT}_SHR32	$SHIFT" &&
+			echo "#define ${CONVERT}_NUM		U64_C($NUM)" &&
+			echo "#define ${CONVERT}_DEN		U64_C($DEN)"
+		) >> $FILENAME || exit 1
+	done
+done
+
+(
+	echo
+	echo "#endif /* __KERNEL_TIMECHONST_H */"
+) >> $FILENAME || exit 1
+
+# Don't rm $FILENAME on exit anymore.
+
+trap "" EXIT
+
+exit 0
-- 
Latency is more important than throughput. It's that simple. - Linus Torvalds

Re: [PATCH 2/3] Remove perl from headers_install

[Rob Landley]

From: Rob Landley <rob@landley.net>

Remove perl from make headers_install by replacing a perl script (doing
a simple regex search and replace) with a smaller and faster shell script
implementation.  The new shell script is a single for loop calling sed and
piping its output through unifdef to produce the target file.

Signed-off-by: Rob Landley <rob@landley.net>
---

Changes from previous version (http://lkml.org/lkml/2009/1/2/22):

Updated for Mike Frysinger's Jan 2 commit adding asm/inline/volatile.

 scripts/Makefile.headersinst |    6 ++--
 scripts/headers_install.pl   |   49 ---------------------------------
 scripts/headers_install.sh   |   39 ++++++++++++++++++++++++++
 3 files changed, 42 insertions(+), 52 deletions(-)

diff -ruN linux-2.6.30.old/scripts/headers_install.pl linux-2.6.30/scripts/headers_install.pl
--- linux-2.6.30.old/scripts/headers_install.pl	2009-06-09 22:05:27.000000000 -0500
+++ linux-2.6.30/scripts/headers_install.pl	1969-12-31 18:00:00.000000000 -0600
@@ -1,49 +0,0 @@
-#!/usr/bin/perl -w
-#
-# headers_install prepare the listed header files for use in
-# user space and copy the files to their destination.
-#
-# Usage: headers_install.pl readdir installdir arch [files...]
-# readdir:    dir to open files
-# installdir: dir to install the files
-# arch:       current architecture
-#             arch is used to force a reinstallation when the arch
-#             changes because kbuild then detect a command line change.
-# files:      list of files to check
-#
-# Step in preparation for users space:
-# 1) Drop all use of compiler.h definitions
-# 2) Drop include of compiler.h
-# 3) Drop all sections defined out by __KERNEL__ (using unifdef)
-
-use strict;
-
-my ($readdir, $installdir, $arch, @files) = @ARGV;
-
-my $unifdef = "scripts/unifdef -U__KERNEL__";
-
-foreach my $file (@files) {
-	local *INFILE;
-	local *OUTFILE;
-	my $tmpfile = "$installdir/$file.tmp";
-	open(INFILE, "<$readdir/$file")
-		or die "$readdir/$file: $!\n";
-	open(OUTFILE, ">$tmpfile") or die "$tmpfile: $!\n";
-	while (my $line = <INFILE>) {
-		$line =~ s/([\s(])__user\s/$1/g;
-		$line =~ s/([\s(])__force\s/$1/g;
-		$line =~ s/([\s(])__iomem\s/$1/g;
-		$line =~ s/\s__attribute_const__\s/ /g;
-		$line =~ s/\s__attribute_const__$//g;
-		$line =~ s/^#include <linux\/compiler.h>//;
-		$line =~ s/(^|\s)(inline)\b/$1__$2__/g;
-		$line =~ s/(^|\s)(asm)\b(\s|[(]|$)/$1__$2__$3/g;
-		$line =~ s/(^|\s|[(])(volatile)\b(\s|[(]|$)/$1__$2__$3/g;
-		printf OUTFILE "%s", $line;
-	}
-	close OUTFILE;
-	close INFILE;
-	system $unifdef . " $tmpfile > $installdir/$file";
-	unlink $tmpfile;
-}
-exit 0;
diff -ruN linux-2.6.30.old/scripts/headers_install.sh linux-2.6.30/scripts/headers_install.sh
--- linux-2.6.30.old/scripts/headers_install.sh	1969-12-31 18:00:00.000000000 -0600
+++ linux-2.6.30/scripts/headers_install.sh	2009-06-22 16:21:23.000000000 -0500
@@ -0,0 +1,39 @@
+#!/bin/sh
+
+if [ $# -lt 2 ]
+then
+	echo "Usage: headers_install.sh INDIR OUTDIR [FILES...]
+	echo
+	echo "Prepares kernel header files for use by user space, by removing"
+	echo "all compiler.h definitions and #includes, removing any"
+	echo "#ifdef __KERNEL__ sections, and putting __underscores__ around"
+	echo "asm/inline/volatile keywords."
+	echo
+	echo "INDIR:  directory to read each kernel header FILE from."
+	echo "OUTDIR: directory to write each userspace header FILE to."
+	echo "FILES:  list of header files to operate on."
+
+	exit 1
+fi
+
+# Grab arguments
+
+INDIR="$1"
+shift
+OUTDIR="$1"
+shift
+
+# Iterate through files listed on command line
+
+for i in "$@"
+do
+	sed -r \
+		-e 's/([ \t(])(__user|__force|__iomem)[ \t]/\1/g' \
+		-e 's/__attribute_const__([ \t]|$)/\1/g' \
+		-e 's@^#include <linux/compiler.h>@@' \
+		-e 's/(^|[ \t])(inline|asm|volatile)([ \t(]|$)/\1__\2__\3/g' \
+		"$INDIR/$i" |
+	scripts/unifdef -U__KERNEL__ - > "$OUTDIR/$i"
+done
+
+exit 0
diff -ruN linux-2.6.30.old/scripts/Makefile.headersinst linux-2.6.30/scripts/Makefile.headersinst
--- linux-2.6.30.old/scripts/Makefile.headersinst	2009-06-09 22:05:27.000000000 -0500
+++ linux-2.6.30/scripts/Makefile.headersinst	2009-06-22 16:21:23.000000000 -0500
@@ -46,8 +46,8 @@
 quiet_cmd_install = INSTALL $(printdir) ($(words $(all-files))\
                             file$(if $(word 2, $(all-files)),s))
       cmd_install = \
-        $(PERL) $< $(srctree)/$(obj) $(install) $(SRCARCH) $(header-y); \
-        $(PERL) $< $(objtree)/$(obj) $(install) $(SRCARCH) $(objhdr-y); \
+      $(CONFIG_SHELL) $< $(srctree)/$(obj) $(install) $(header-y); \
+      $(CONFIG_SHELL) $< $(objtree)/$(obj) $(install) $(objhdr-y); \
         touch $@
 
 quiet_cmd_remove = REMOVE  $(unwanted)
@@ -66,7 +66,7 @@
 	@:
 
 targets += $(install-file)
-$(install-file): scripts/headers_install.pl $(input-files) FORCE
+$(install-file): scripts/headers_install.sh $(input-files) FORCE
 	$(if $(unwanted),$(call cmd,remove),)
 	$(if $(wildcard $(dir $@)),,$(shell mkdir -p $(dir $@)))
 	$(call if_changed,install)

-- 
Latency is more important than throughput. It's that simple. - Linus Torvalds

Re: [PATCH 3/3] Convert mkcapflags.pl to mkcapflags.sh

[Rob Landley]

From: Rob Landley <rob@landley.net>

Convert kernel/cpu/mkcapflags.pl to kernel/cpu/mkcapflags.sh.

This script generates kernel/cpu/capflags.c from include/asm/cpufeature.h.

Signed-off-by: Rob Landley <rob@landley.net>
---

Changes from previous version (http://lkml.org/lkml/2009/1/2/24):

None, just a rediff for 2.6.30.

 arch/x86/kernel/cpu/Makefile      |    4 +--
 arch/x86/kernel/cpu/mkcapflags.pl |   32 ----------------------------
 arch/x86/kernel/cpu/mkcapflags.sh |   28 ++++++++++++++++++++++++
 3 files changed, 30 insertions(+), 34 deletions(-)

diff -ruN linux-2.6.30.old/arch/x86/kernel/cpu/Makefile linux-2.6.30/arch/x86/kernel/cpu/Makefile
--- linux-2.6.30.old/arch/x86/kernel/cpu/Makefile	2009-06-09 22:05:27.000000000 -0500
+++ linux-2.6.30/arch/x86/kernel/cpu/Makefile	2009-06-22 16:39:06.000000000 -0500
@@ -30,10 +30,10 @@
 obj-$(CONFIG_X86_LOCAL_APIC) += perfctr-watchdog.o
 
 quiet_cmd_mkcapflags = MKCAP   $@
-      cmd_mkcapflags = $(PERL) $(srctree)/$(src)/mkcapflags.pl $< $@
+      cmd_mkcapflags = $(CONFIG_SHELL) $(srctree)/$(src)/mkcapflags.sh $< $@
 
 cpufeature = $(src)/../../include/asm/cpufeature.h
 
 targets += capflags.c
-$(obj)/capflags.c: $(cpufeature) $(src)/mkcapflags.pl FORCE
+$(obj)/capflags.c: $(cpufeature) $(src)/mkcapflags.sh FORCE
 	$(call if_changed,mkcapflags)
diff -ruN linux-2.6.30.old/arch/x86/kernel/cpu/mkcapflags.pl linux-2.6.30/arch/x86/kernel/cpu/mkcapflags.pl
--- linux-2.6.30.old/arch/x86/kernel/cpu/mkcapflags.pl	2009-06-09 22:05:27.000000000 -0500
+++ linux-2.6.30/arch/x86/kernel/cpu/mkcapflags.pl	1969-12-31 18:00:00.000000000 -0600
@@ -1,32 +0,0 @@
-#!/usr/bin/perl
-#
-# Generate the x86_cap_flags[] array from include/asm-x86/cpufeature.h
-#
-
-($in, $out) = @ARGV;
-
-open(IN, "< $in\0")   or die "$0: cannot open: $in: $!\n";
-open(OUT, "> $out\0") or die "$0: cannot create: $out: $!\n";
-
-print OUT "#include <asm/cpufeature.h>\n\n";
-print OUT "const char * const x86_cap_flags[NCAPINTS*32] = {\n";
-
-while (defined($line = <IN>)) {
-	if ($line =~ /^\s*\#\s*define\s+(X86_FEATURE_(\S+))\s+(.*)$/) {
-		$macro = $1;
-		$feature = $2;
-		$tail = $3;
-		if ($tail =~ /\/\*\s*\"([^"]*)\".*\*\//) {
-			$feature = $1;
-		}
-
-		if ($feature ne '') {
-			printf OUT "\t%-32s = \"%s\",\n",
-				"[$macro]", "\L$feature";
-		}
-	}
-}
-print OUT "};\n";
-
-close(IN);
-close(OUT);
diff -ruN linux-2.6.30.old/arch/x86/kernel/cpu/mkcapflags.sh linux-2.6.30/arch/x86/kernel/cpu/mkcapflags.sh
--- linux-2.6.30.old/arch/x86/kernel/cpu/mkcapflags.sh	1969-12-31 18:00:00.000000000 -0600
+++ linux-2.6.30/arch/x86/kernel/cpu/mkcapflags.sh	2009-06-22 16:39:06.000000000 -0500
@@ -0,0 +1,28 @@
+#!/bin/sh
+#
+# Generate the x86_cap_flags[] array from include/asm/cpufeature.h
+#
+
+IN=$1
+OUT=$2
+
+(
+	echo "#include <asm/cpufeature.h>"
+	echo ""
+	echo "const char * const x86_cap_flags[NCAPINTS*32] = {"
+
+	# Iterate through any input lines starting with #define X86_FEATURE_
+	sed -n -e 's/\t/ /g' -e 's/^ *# *define *X86_FEATURE_//p' $IN |
+	while read i
+	do
+		# Name is everything up to the first whitespace
+		NAME="$(echo "$i" | sed 's/ .*//')"
+
+		# If the /* comment */ starts with a quote string, grab that.
+		VALUE="$(echo "$i" | sed -n 's@.*/\* *\("[^"]*"\).*\*/@\1@p')"
+		[ -z "$VALUE" ] && VALUE="\"$(echo "$NAME" | tr A-Z a-z)\""
+
+		[ "$VALUE" != '""' ] && echo "	[X86_FEATURE_$NAME] = $VALUE,"
+	done
+	echo "};"
+) > $OUT

-- 
Latency is more important than throughput. It's that simple. - Linus Torvalds