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Date: Tue, 18 Jan 2011 08:06:20 -0600
From: Rob Landley <rlandley@...allels.com>
To: Michal Marek <mmarek@...e.cz>, <linux-kernel@...r.kernel.org>,
<linux-kbuild@...r.kernel.org>, Jesper Juhl <jj@...osbits.net>
Subject: [PATCH] Replace scripts/headers_install.pl with a shell script.
From: Rob Landley <rlandley@...allels.com>
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.
Change from last time: better error handling. Split "sed | unifdef" into
two stages with a temp file because dash hasn't got PIPEFAIL. Add check
for exit code, add trap handler to delete output when exiting prematurely.
Signed-off-by: Rob Landley <rlandley@...allels.com>
---
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.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 +1,42 @@
+#!/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
+
+trap "rm -f $OUTDIR/$i $OUTDIR.sed" EXIT
+for i in "$@"
+do
+ sed -r \
+ -e 's/([ \t(])(__user|__force|__iomem)[ \t]/\1/g' \
+ -e 's/__attribute_const__([ \t]|$)/\1/g' \
+ -e 's@...nclude <linux/compiler.h>@@' \
+ -e 's/(^|[ \t])(inline|asm|volatile)([ \t(]|$)/\1__\2__\3/g' \
+ "$INDIR/$i" > "$OUTDIR/$i.sed" || exit 1
+ scripts/unifdef -U__KERNEL__ -D__EXPORTED_HEADERS__ "$OUTDIR/$i.sed" \
+ > "$OUTDIR/$i"
+ [ $? -gt 1 ] && exit 1
+ rm -f "$OUTDIR/$i.sed"
+done
+trap - EXIT
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
@@ -45,8 +45,8 @@
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)
@@ -69,7 +69,7 @@
@:
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 $@)))
$(call if_changed,install)
--- a/scripts/headers_install.pl
+++ /dev/null
@@ -1,57 +0,0 @@
-#!/usr/bin/perl -w
-#
-# headers_install prepare the listed header files for use in
-# user space and copy the files to their destination.
-#
-# Usage: headers_install.pl readdir installdir arch [files...]
-# readdir: dir to open files
-# installdir: dir to install the files
-# arch: current architecture
-# arch is used to force a reinstallation when the arch
-# changes because kbuild then detect a command line change.
-# files: list of files to check
-#
-# Step in preparation for users space:
-# 1) Drop all use of compiler.h definitions
-# 2) Drop include of compiler.h
-# 3) Drop all sections defined out by __KERNEL__ (using unifdef)
-
-use strict;
-
-my ($readdir, $installdir, $arch, @files) = @ARGV;
-
-my $unifdef = "scripts/unifdef -U__KERNEL__ -D__EXPORTED_HEADERS__";
-
-foreach my $file (@files) {
- my $tmpfile = "$installdir/$file.tmp";
-
- open(my $in, '<', "$readdir/$file")
- or die "$readdir/$file: $!\n";
- open(my $out, '>', $tmpfile)
- or die "$tmpfile: $!\n";
- while (my $line = <$in>) {
- $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__$3/g;
- printf {$out} "%s", $line;
- }
- close $out;
- close $in;
-
- system $unifdef . " $tmpfile > $installdir/$file";
- # unifdef will exit 0 on success, and will exit 1 when the
- # file was processed successfully but no changes were made,
- # so abort only when it's higher than that.
- my $e = $? >> 8;
- if ($e > 1) {
- die "$tmpfile: $!\n";
- }
- unlink $tmpfile;
-}
-exit 0;
--
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