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 <hutter2@llnl.gov>
Reviewed-by: Olaf Faaland <faaland1@llnl.gov>
Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: Pavel Zakharov <pavel.zakharov@delphix.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
TEST_ZIMPORT_SKIP="yes"
Closes #7556

rpm/generic/zfs-dkms.spec.in

@@ -21,10 +21,10 @@ BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 BuildArch:      noarch
 
 Requires:       dkms >= 2.2.0.3
-Requires:       spl-dkms = %{version}
 Requires:       gcc, make, perl
 %if 0%{?rhel}%{?fedora}%{?mageia}%{?suse_version}
 Requires:       kernel-devel
+Obsoletes:      spl-dkms
 %endif
 Provides:       %{module}-kmod = %{version}
 AutoReqProv:    no

rpm/generic/zfs-kmod.spec.in

@@ -79,13 +79,6 @@ BuildRequires:  %{_bindir}/kmodtool
 %endif
 %endif
 
-%if 0%{?rhel}%{?fedora}%{?suse_version}
-BuildRequires:             kmod-spl-devel = %{version}
-%global KmodsRequires      kmod-spl
-%global KmodsDevelRequires kmod-spl-devel
-%global KmodsMetaRequires  spl-kmod
-%endif
-
 # LDFLAGS are not sanitized by arch/*/Makefile for these architectures.
 %ifarch ppc ppc64 ppc64le aarch64
 %global __global_ldflags %{nil}
@@ -98,7 +91,7 @@ BuildRequires:             kmod-spl-devel = %{version}
 # Kmodtool does its magic here.  A patched version of kmodtool is shipped
 # with the source rpm until kmod development packages are supported upstream.
 # https://bugzilla.rpmfusion.org/show_bug.cgi?id=2714
-%{expand:%(bash %{SOURCE10} --target %{_target_cpu} %{?repo:--repo %{?repo}} --kmodname %{name} %{?buildforkernels:--%{buildforkernels}} --devel %{?prefix:--prefix "%{?prefix}"} %{?kernels:--for-kernels "%{?kernels}"} %{?kernelbuildroot:--buildroot "%{?kernelbuildroot}"} 2>/dev/null) }
+%{expand:%(bash %{SOURCE10} --target %{_target_cpu} %{?repo:--repo %{?repo}} --kmodname %{name} %{?buildforkernels:--%{buildforkernels}} --devel %{?prefix:--prefix "%{?prefix}"} %{?kernels:--for-kernels "%{?kernels}"} %{?kernelbuildroot:--buildroot "%{?kernelbuildroot}"} --obsolete-name spl --obsolete-version 0.8 2>/dev/null) }
 
 
 %description
@@ -109,7 +102,7 @@ This package contains the ZFS kernel modules.
 %{?kmodtool_check}
 
 # Print kmodtool output for debugging purposes:
-bash %{SOURCE10}  --target %{_target_cpu} %{?repo:--repo %{?repo}} --kmodname %{name} %{?buildforkernels:--%{buildforkernels}} --devel %{?prefix:--prefix "%{?prefix}"} %{?kernels:--for-kernels "%{?kernels}"} %{?kernelbuildroot:--buildroot "%{?kernelbuildroot}"} 2>/dev/null
+bash %{SOURCE10}  --target %{_target_cpu} %{?repo:--repo %{?repo}} --kmodname %{name} %{?buildforkernels:--%{buildforkernels}} --devel %{?prefix:--prefix "%{?prefix}"} %{?kernels:--for-kernels "%{?kernels}"} %{?kernelbuildroot:--buildroot "%{?kernelbuildroot}"} --obsolete-name spl --obsolete-version 0.8 2>/dev/null
 
 %if %{with debug}
     %define debug --enable-debug
@@ -123,28 +116,6 @@ bash %{SOURCE10}  --target %{_target_cpu} %{?repo:--repo %{?repo}} --kmodname %{
     %define debuginfo --disable-debuginfo
 %endif
 
-#
-# Allow the overriding of spl locations
-#
-%if %{defined require_splver}
-%define splver %{require_splver}
-%else
-%define splver %{version}
-%endif
-
-%if %{defined require_spldir}
-%define spldir %{require_spldir}
-%else
-%define spldir %{_usrsrc}/spl-%{splver}
-%endif
-
-%if %{defined require_splobj}
-%define splobj %{require_splobj}
-%else
-%define splobj %{spldir}/${kernel_version%%___*}
-%endif
-
-
 # Leverage VPATH from configure to avoid making multiple copies.
 %define _configure ../%{module}-%{version}/configure
 
@@ -161,8 +132,6 @@ for kernel_version in %{?kernel_versions}; do
         --with-config=kernel \
         --with-linux=%{ksrc} \
         --with-linux-obj=%{kobj} \
-        --with-spl="%{spldir}" \
-        --with-spl-obj="%{splobj}" \
         %{debug} \
         %{debuginfo}
     make %{?_smp_mflags}

rpm/generic/zfs.spec.in

@@ -80,13 +80,13 @@ License:        @ZFS_META_LICENSE@
 URL:            http://zfsonlinux.org/
 Source0:        %{name}-%{version}.tar.gz
 BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
-Requires:       spl = %{version}
 Requires:       libzpool2 = %{version}
 Requires:       libnvpair1 = %{version}
 Requires:       libuutil1 = %{version}
 Requires:       libzfs2 = %{version}
 Requires:       %{name}-kmod = %{version}
 Provides:       %{name}-kmod-common = %{version}
+Obsoletes:      spl
 
 # zfs-fuse provides the same commands and man pages that ZoL does. Renaming
 # those on either side would conflict with all available documentation.
@@ -396,8 +396,7 @@ systemctl --system daemon-reload >/dev/null || true
 %{_datadir}/pkgconfig/libzfs_core.pc
 %{_libdir}/*.so
 %{_includedir}/*
-%doc AUTHORS COPYRIGHT DISCLAIMER
-%doc OPENSOLARIS.LICENSE README.markdown
+%doc AUTHORS COPYRIGHT LICENSE NOTICE README.md
 
 %files test
 %{_datadir}/%{name}