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#!/usr/bin/perl
#
# 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;
use warnings;
my ($readdir, $installdir, $arch, @files) = @ARGV;
my $unifdef = "scripts/unifdef -U__KERNEL__";
foreach my $file (@files) {
my $tmpfile = "$installdir/$file.tmp";
open(my $infile, '<', "$readdir/$file")
or die "$readdir/$file: $!\n";
open(my $outfile, '>', "$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>//;
printf $outfile "%s", $line;
}
close $outfile;
close $infile;
system $unifdef . " $tmpfile > $installdir/$file";
unlink $tmpfile;
}
exit 0;
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