UAPI: Plumb the UAPI Kbuilds into the user header installation and checking

Plumb the UAPI Kbuilds into the user header installation and checking system.
As the headers are split the entries will be transferred across from the old
Kbuild files to the UAPI Kbuild files.

The changes made in this commit are:

 (1) Exported generated files (of which there are currently four) are moved to
     uapi/ directories under the appropriate generated/ directory, thus we
     get:

	include/generated/uapi/linux/version.h
	arch/x86/include/generated/uapi/asm/unistd_32.h
	arch/x86/include/generated/uapi/asm/unistd_64.h
	arch/x86/include/generated/uapi/asm/unistd_x32.h

     These paths were added to the build as -I flags in a previous patch.

 (2) scripts/Makefile.headersinst is now given the UAPI path to install from
     rather than the old path.

     It then determines the old path from that and includes that Kbuild also
     if it exists, thus permitting the headers to exist in either directory
     during the changeover.

     I also renamed the "install" variable to "installdir" as it refers to a
     directory not the install program.

 (3) scripts/headers_install.pl is altered to take a list of source file paths
     instead of just their names so that the makefile can tell it exactly
     where to find each file.

     For the moment, files can be obtained from one of four places for each
     output directory:

	.../include/uapi/foo/
	.../include/generated/uapi/foo/
	.../include/foo/
	.../include/generated/foo/

     The non-UAPI paths will be dropped later.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Dave Jones <davej@redhat.com>

1 files changed, 8 insertions, 6 deletions

diff --git a/scripts/headers_install.pl b/scripts/headers_install.pl
index 48462be328bb..239d22d4207b 100644
--- a/scripts/headers_install.pl
+++ b/scripts/headers_install.pl
@@ -4,8 +4,7 @@
 # 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
+# installdir: dir to install the files to
 # arch:       current architecture
 #             arch is used to force a reinstallation when the arch
 #             changes because kbuild then detect a command line change.
@@ -18,15 +17,18 @@
 
 use strict;
 
-my ($readdir, $installdir, $arch, @files) = @ARGV;
+my ($installdir, $arch, @files) = @ARGV;
 
 my $unifdef = "scripts/unifdef -U__KERNEL__ -D__EXPORTED_HEADERS__";
 
-foreach my $file (@files) {
+foreach my $filename (@files) {
+        my $file = $filename;
+        $file =~ s!^.*/!!;
+
         my $tmpfile = "$installdir/$file.tmp";
 
-        open(my $in, '<', "$readdir/$file")
-            or die "$readdir/$file: $!\n";
+        open(my $in, '<', $filename)
+            or die "$filename: $!\n";
         open(my $out, '>', $tmpfile)
             or die "$tmpfile: $!\n";
         while (my $line = <$in>) {