Update build system and packaging

Minimal changes required to integrate the SPL sources in to the
ZFS repository build infrastructure and packaging.

Build system and packaging:
  * Renamed SPL_* autoconf m4 macros to ZFS_*.
  * Removed redundant SPL_* autoconf m4 macros.
  * Updated the RPM spec files to remove SPL package dependency.
  * The zfs package obsoletes the spl package, and the zfs-kmod
    package obsoletes the spl-kmod package.
  * The zfs-kmod-devel* packages were updated to add compatibility
    symlinks under /usr/src/spl-x.y.z until all dependent packages
    can be updated.  They will be removed in a future release.
  * Updated copy-builtin script for in-kernel builds.
  * Updated DKMS package to include the spl.ko.
  * Updated stale AUTHORS file to include all contributors.
  * Updated stale COPYRIGHT and included the SPL as an exception.
  * Renamed README.markdown to README.md
  * Renamed OPENSOLARIS.LICENSE to LICENSE.
  * Renamed DISCLAIMER to NOTICE.

Required code changes:
  * Removed redundant HAVE_SPL macro.
  * Removed _BOOT from nvpairs since it doesn't apply for Linux.
  * Initial header cleanup (removal of empty headers, refactoring).
  * Remove SPL repository clone/build from zimport.sh.
  * Use of DEFINE_RATELIMIT_STATE and DEFINE_SPINLOCK removed due
    to build issues when forcing C99 compilation.
  * Replaced legacy ACCESS_ONCE with READ_ONCE.
  * Include needed headers for `current` and `EXPORT_SYMBOL`.

Reviewed-by: Tony Hutter <[email protected]>
Reviewed-by: Olaf Faaland <[email protected]>
Reviewed-by: Matthew Ahrens <[email protected]>
Reviewed-by: Pavel Zakharov <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
TEST_ZIMPORT_SKIP="yes"
Closes #7556

3 files changed, 38 insertions, 1 deletions

diff --git a/include/linux/Makefile.am b/include/linux/Makefile.am
index 89c2689f6..efb49520e 100644
--- a/include/linux/Makefile.am
+++ b/include/linux/Makefile.am
@@ -10,7 +10,8 @@ KERNEL_H = \
 	$(top_srcdir)/include/linux/simd_x86.h \
 	$(top_srcdir)/include/linux/simd_aarch64.h \
 	$(top_srcdir)/include/linux/mod_compat.h \
-	$(top_srcdir)/include/linux/page_compat.h
+	$(top_srcdir)/include/linux/page_compat.h \
+	$(top_srcdir)/include/linux/compiler_compat.h
 
 USER_H =
 
diff --git a/include/linux/blkdev_compat.h b/include/linux/blkdev_compat.h
index f99980ab3..c42cdd37a 100644
--- a/include/linux/blkdev_compat.h
+++ b/include/linux/blkdev_compat.h
@@ -32,6 +32,7 @@
 #include <linux/blkdev.h>
 #include <linux/elevator.h>
 #include <linux/backing-dev.h>
+#include <linux/hdreg.h>
 
 #ifndef HAVE_FMODE_T
 typedef unsigned __bitwise__ fmode_t;
diff --git a/include/linux/compiler_compat.h b/include/linux/compiler_compat.h
new file mode 100644
index 000000000..921d32f24
--- /dev/null
+++ b/include/linux/compiler_compat.h
@@ -0,0 +1,35 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+/*
+ * Copyright (C) 2018 Lawrence Livermore National Security, LLC.
+ */
+
+#ifndef _ZFS_COMPILER_COMPAT_H
+#define	_ZFS_COMPILER_COMPAT_H
+
+#include <linux/compiler.h>
+
+#if !defined(READ_ONCE)
+#define	READ_ONCE(x)		ACCESS_ONCE(x)
+#endif
+
+#endif	/* _ZFS_COMPILER_COMPAT_H */