c01226c314
User applications frequently hit problems when they try to use the kernel headers directly, rather than the exported headers. This adds an explicit warning for this case, and points to a URL holding an explanation of why this is wrong and what to do about it. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
49 lines
1.5 KiB
Perl
49 lines
1.5 KiB
Perl
#!/usr/bin/perl -w
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#
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# headers_install prepare the listed header files for use in
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# user space and copy the files to their destination.
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#
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# Usage: headers_install.pl readdir installdir arch [files...]
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# readdir: dir to open files
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# installdir: dir to install the files
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# arch: current architecture
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# arch is used to force a reinstallation when the arch
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# changes because kbuild then detect a command line change.
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# files: list of files to check
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#
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# Step in preparation for users space:
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# 1) Drop all use of compiler.h definitions
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# 2) Drop include of compiler.h
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# 3) Drop all sections defined out by __KERNEL__ (using unifdef)
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use strict;
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my ($readdir, $installdir, $arch, @files) = @ARGV;
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my $unifdef = "scripts/unifdef -U__KERNEL__ -D__EXPORTED_HEADERS__";
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foreach my $file (@files) {
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local *INFILE;
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local *OUTFILE;
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my $tmpfile = "$installdir/$file.tmp";
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open(INFILE, "<$readdir/$file")
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or die "$readdir/$file: $!\n";
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open(OUTFILE, ">$tmpfile") or die "$tmpfile: $!\n";
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while (my $line = <INFILE>) {
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$line =~ s/([\s(])__user\s/$1/g;
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$line =~ s/([\s(])__force\s/$1/g;
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$line =~ s/([\s(])__iomem\s/$1/g;
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$line =~ s/\s__attribute_const__\s/ /g;
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$line =~ s/\s__attribute_const__$//g;
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$line =~ s/^#include <linux\/compiler.h>//;
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$line =~ s/(^|\s)(inline)\b/$1__$2__/g;
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$line =~ s/(^|\s)(asm)\b(\s|[(]|$)/$1__$2__$3/g;
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$line =~ s/(^|\s|[(])(volatile)\b(\s|[(]|$)/$1__$2__$3/g;
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printf OUTFILE "%s", $line;
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}
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close OUTFILE;
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close INFILE;
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system $unifdef . " $tmpfile > $installdir/$file";
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unlink $tmpfile;
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}
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exit 0;
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