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

24 files changed, 324 insertions, 422 deletions

diff --git a/config/kernel-ctl-table-name.m4 b/config/kernel-ctl-table-name.m4
index 8dd2e77cb..3ce499968 100644
--- a/config/kernel-ctl-table-name.m4
+++ b/config/kernel-ctl-table-name.m4
@@ -2,9 +2,9 @@ dnl #
 dnl # 2.6.33 API change,
 dnl # Removed .ctl_name from struct ctl_table.
 dnl #
-AC_DEFUN([SPL_AC_CTL_NAME], [
+AC_DEFUN([ZFS_AC_KERNEL_CTL_NAME], [
 	AC_MSG_CHECKING([whether struct ctl_table has ctl_name])
-	SPL_LINUX_TRY_COMPILE([
+	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/sysctl.h>
 	],[
 		struct ctl_table ctl __attribute__ ((unused));
diff --git a/config/kernel-fallocate-pax.m4 b/config/kernel-fallocate-pax.m4
index ac75a4c8e..e8948be17 100644
--- a/config/kernel-fallocate-pax.m4
+++ b/config/kernel-fallocate-pax.m4
@@ -1,9 +1,9 @@
 dnl #
 dnl # PaX Linux 2.6.38 - 3.x API
 dnl #
-AC_DEFUN([SPL_AC_PAX_KERNEL_FILE_FALLOCATE], [
+AC_DEFUN([ZFS_AC_PAX_KERNEL_FILE_FALLOCATE], [
 	AC_MSG_CHECKING([whether fops->fallocate() exists])
-	SPL_LINUX_TRY_COMPILE([
+	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/fs.h>
 	],[
 		long (*fallocate) (struct file *, int, loff_t, loff_t) = NULL;
diff --git a/config/kernel-group-info.m4 b/config/kernel-group-info.m4
index 4db2bba5c..849a1e246 100644
--- a/config/kernel-group-info.m4
+++ b/config/kernel-group-info.m4
@@ -2,11 +2,11 @@ dnl #
 dnl # 4.9 API change
 dnl # group_info changed from 2d array via >blocks to 1d array via ->gid
 dnl #
-AC_DEFUN([SPL_AC_GROUP_INFO_GID], [
+AC_DEFUN([ZFS_AC_KERNEL_GROUP_INFO_GID], [
 	AC_MSG_CHECKING([whether group_info->gid exists])
 	tmp_flags="$EXTRA_KCFLAGS"
 	EXTRA_KCFLAGS="-Werror"
-	SPL_LINUX_TRY_COMPILE([
+	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/cred.h>
 	],[
 		struct group_info *gi = groups_alloc(1);
diff --git a/config/kernel-inode-lock.m4 b/config/kernel-inode-lock.m4
index 2cc06a5ec..8dee01422 100644
--- a/config/kernel-inode-lock.m4
+++ b/config/kernel-inode-lock.m4
@@ -4,11 +4,11 @@ dnl # i_mutex is changed to i_rwsem. Instead of directly using
 dnl # i_mutex/i_rwsem, we should use inode_lock() and inode_lock_shared()
 dnl # We test inode_lock_shared because inode_lock is introduced earlier.
 dnl #
-AC_DEFUN([SPL_AC_INODE_LOCK], [
+AC_DEFUN([ZFS_AC_KERNEL_INODE_LOCK], [
 	AC_MSG_CHECKING([whether inode_lock_shared() exists])
 	tmp_flags="$EXTRA_KCFLAGS"
 	EXTRA_KCFLAGS="-Werror"
-	SPL_LINUX_TRY_COMPILE([
+	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/fs.h>
 	],[
 		struct inode *inode = NULL;
diff --git a/config/kernel-kmem-cache.m4 b/config/kernel-kmem-cache.m4
index 50a7fdb4b..21cc53d34 100644
--- a/config/kernel-kmem-cache.m4
+++ b/config/kernel-kmem-cache.m4
@@ -5,9 +5,9 @@ dnl # private allocation flags which are applied when allocating a new slab
 dnl # in kmem_getpages().  Unfortunately there is no public API for setting
 dnl # non-default flags.
 dnl #
-AC_DEFUN([SPL_AC_KMEM_CACHE_ALLOCFLAGS], [
+AC_DEFUN([ZFS_AC_KERNEL_KMEM_CACHE_ALLOCFLAGS], [
 	AC_MSG_CHECKING([whether struct kmem_cache has allocflags])
-	SPL_LINUX_TRY_COMPILE([
+	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/slab.h>
 	],[
 		struct kmem_cache cachep __attribute__ ((unused));
@@ -20,7 +20,7 @@ AC_DEFUN([SPL_AC_KMEM_CACHE_ALLOCFLAGS], [
 		AC_MSG_RESULT(no)
 
 		AC_MSG_CHECKING([whether struct kmem_cache has gfpflags])
-		SPL_LINUX_TRY_COMPILE([
+		ZFS_LINUX_TRY_COMPILE([
 			#include <linux/slab.h>
 		],[
 			struct kmem_cache cachep __attribute__ ((unused));
@@ -40,11 +40,11 @@ dnl # grsecurity API change,
 dnl # kmem_cache_create() with SLAB_USERCOPY flag replaced by
 dnl # kmem_cache_create_usercopy().
 dnl #
-AC_DEFUN([SPL_AC_KMEM_CACHE_CREATE_USERCOPY], [
+AC_DEFUN([ZFS_AC_KERNEL_KMEM_CACHE_CREATE_USERCOPY], [
 	AC_MSG_CHECKING([whether kmem_cache_create_usercopy() exists])
 	tmp_flags="$EXTRA_KCFLAGS"
 	EXTRA_KCFLAGS="-Werror"
-	SPL_LINUX_TRY_COMPILE([
+	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/slab.h>
 		static void ctor(void *foo)
 		{
diff --git a/config/kernel-kuidgid.m4 b/config/kernel-kuidgid.m4
index 47d193783..82685d263 100644
--- a/config/kernel-kuidgid.m4
+++ b/config/kernel-kuidgid.m4
@@ -3,19 +3,19 @@ dnl # User namespaces, use kuid_t in place of uid_t
 dnl # where available. Not strictly a user namespaces thing
 dnl # but it should prevent surprises
 dnl #
-AC_DEFUN([SPL_AC_KUIDGID_T], [
+AC_DEFUN([ZFS_AC_KERNEL_KUIDGID_T], [
 	AC_MSG_CHECKING([whether kuid_t/kgid_t is available])
-	SPL_LINUX_TRY_COMPILE([
+	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/uidgid.h>
 	], [
-		kuid_t userid = KUIDT_INIT(0);
-		kgid_t groupid = KGIDT_INIT(0);
+		kuid_t userid __attribute__ ((unused)) = KUIDT_INIT(0);
+		kgid_t groupid __attribute__ ((unused)) = KGIDT_INIT(0);
 	],[
-		SPL_LINUX_TRY_COMPILE([
+		ZFS_LINUX_TRY_COMPILE([
 			#include <linux/uidgid.h>
 		], [
-			kuid_t userid = 0;
-			kgid_t groupid = 0;
+			kuid_t userid __attribute__ ((unused)) = 0;
+			kgid_t groupid __attribute__ ((unused)) = 0;
 		],[
 			AC_MSG_RESULT(yes; optional)
 		],[
diff --git a/config/kernel-pde-data.m4 b/config/kernel-pde-data.m4
index 6aa5765c3..8aa4c2204 100644
--- a/config/kernel-pde-data.m4
+++ b/config/kernel-pde-data.m4
@@ -2,9 +2,9 @@ dnl #
 dnl # 3.10 API change,
 dnl # PDE is replaced by PDE_DATA
 dnl #
-AC_DEFUN([SPL_AC_PDE_DATA], [
+AC_DEFUN([ZFS_AC_KERNEL_PDE_DATA], [
 	AC_MSG_CHECKING([whether PDE_DATA() is available])
-	SPL_LINUX_TRY_COMPILE_SYMBOL([
+	ZFS_LINUX_TRY_COMPILE_SYMBOL([
 		#include <linux/proc_fs.h>
 	], [
 		PDE_DATA(NULL);
diff --git a/config/kernel-rw.m4 b/config/kernel-rw.m4
index 23c14b70f..1c8a265e0 100644
--- a/config/kernel-rw.m4
+++ b/config/kernel-rw.m4
@@ -3,11 +3,11 @@ dnl # 4.14 API change
 dnl # kernel_write() which was introduced in 3.9 was updated to take
 dnl # the offset as a pointer which is needed by vn_rdwr().
 dnl #
-AC_DEFUN([SPL_AC_KERNEL_WRITE], [
+AC_DEFUN([ZFS_AC_KERNEL_WRITE], [
 	AC_MSG_CHECKING([whether kernel_write() takes loff_t pointer])
 	tmp_flags="$EXTRA_KCFLAGS"
 	EXTRA_KCFLAGS="-Werror"
-	SPL_LINUX_TRY_COMPILE([
+	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/fs.h>
 	],[
 		struct file *file = NULL;
@@ -32,11 +32,11 @@ dnl # 4.14 API change
 dnl # kernel_read() which has existed for forever was updated to take
 dnl # the offset as a pointer which is needed by vn_rdwr().
 dnl #
-AC_DEFUN([SPL_AC_KERNEL_READ], [
+AC_DEFUN([ZFS_AC_KERNEL_READ], [
 	AC_MSG_CHECKING([whether kernel_read() takes loff_t pointer])
 	tmp_flags="$EXTRA_KCFLAGS"
 	EXTRA_KCFLAGS="-Werror"
-	SPL_LINUX_TRY_COMPILE([
+	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/fs.h>
 	],[
 		struct file *file = NULL;
diff --git a/config/kernel-rwsem.m4 b/config/kernel-rwsem.m4
index aee20ae90..532c22718 100644
--- a/config/kernel-rwsem.m4
+++ b/config/kernel-rwsem.m4
@@ -4,11 +4,11 @@ dnl #
 dnl # The rw_semaphore.wait_lock member was changed from spinlock_t to
 dnl # raw_spinlock_t at commit ddb6c9b58a19edcfac93ac670b066c836ff729f1.
 dnl #
-AC_DEFUN([SPL_AC_RWSEM_SPINLOCK_IS_RAW], [
+AC_DEFUN([ZFS_AC_KERNEL_RWSEM_SPINLOCK_IS_RAW], [
 	AC_MSG_CHECKING([whether struct rw_semaphore member wait_lock is raw])
 	tmp_flags="$EXTRA_KCFLAGS"
 	EXTRA_KCFLAGS="-Werror"
-	SPL_LINUX_TRY_COMPILE([
+	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/rwsem.h>
 	],[
 		struct rw_semaphore dummy_semaphore __attribute__ ((unused));
@@ -30,11 +30,11 @@ dnl # 3.16 API Change
 dnl #
 dnl # rwsem-spinlock "->activity" changed to "->count"
 dnl #
-AC_DEFUN([SPL_AC_RWSEM_ACTIVITY], [
+AC_DEFUN([ZFS_AC_KERNEL_RWSEM_ACTIVITY], [
 	AC_MSG_CHECKING([whether struct rw_semaphore has member activity])
 	tmp_flags="$EXTRA_KCFLAGS"
 	EXTRA_KCFLAGS="-Werror"
-	SPL_LINUX_TRY_COMPILE([
+	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/rwsem.h>
 	],[
 		struct rw_semaphore dummy_semaphore __attribute__ ((unused));
@@ -54,12 +54,12 @@ dnl # 4.8 API Change
 dnl #
 dnl # rwsem "->count" changed to atomic_long_t type
 dnl #
-AC_DEFUN([SPL_AC_RWSEM_ATOMIC_LONG_COUNT], [
+AC_DEFUN([ZFS_AC_KERNEL_RWSEM_ATOMIC_LONG_COUNT], [
 	AC_MSG_CHECKING(
 	[whether struct rw_semaphore has atomic_long_t member count])
 	tmp_flags="$EXTRA_KCFLAGS"
 	EXTRA_KCFLAGS="-Werror"
-	SPL_LINUX_TRY_COMPILE([
+	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/rwsem.h>
 	],[
 		DECLARE_RWSEM(dummy_semaphore);
diff --git a/config/kernel-sched.m4 b/config/kernel-sched.m4
index 5ae21676e..640b008aa 100644
--- a/config/kernel-sched.m4
+++ b/config/kernel-sched.m4
@@ -2,9 +2,9 @@ dnl #
 dnl # 3.9 API change,
 dnl # Moved things from linux/sched.h to linux/sched/rt.h
 dnl #
-AC_DEFUN([SPL_AC_SCHED_RT_HEADER],
+AC_DEFUN([ZFS_AC_KERNEL_SCHED_RT_HEADER],
 	[AC_MSG_CHECKING([whether header linux/sched/rt.h exists])
-	SPL_LINUX_TRY_COMPILE([
+	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/sched.h>
 		#include <linux/sched/rt.h>
 	],[
@@ -21,9 +21,9 @@ dnl #
 dnl # 4.11 API change,
 dnl # Moved things from linux/sched.h to linux/sched/signal.h
 dnl #
-AC_DEFUN([SPL_AC_SCHED_SIGNAL_HEADER],
+AC_DEFUN([ZFS_AC_KERNEL_SCHED_SIGNAL_HEADER],
 	[AC_MSG_CHECKING([whether header linux/sched/signal.h exists])
-	SPL_LINUX_TRY_COMPILE([
+	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/sched.h>
 		#include <linux/sched/signal.h>
 	],[
@@ -41,9 +41,9 @@ dnl # The io_schedule_timeout() function is present in all 2.6.32 kernels
 dnl # but it was not exported until Linux 3.19.  The RHEL 7.x kernels which
 dnl # are based on a 3.10 kernel do export this symbol.
 dnl #
-AC_DEFUN([SPL_AC_IO_SCHEDULE_TIMEOUT], [
+AC_DEFUN([ZFS_AC_KERNEL_IO_SCHEDULE_TIMEOUT], [
 	AC_MSG_CHECKING([whether io_schedule_timeout() is available])
-	SPL_LINUX_TRY_COMPILE_SYMBOL([
+	ZFS_LINUX_TRY_COMPILE_SYMBOL([
 		#include <linux/sched.h>
 	], [
 		(void) io_schedule_timeout(1);
diff --git a/config/kernel-set-fs-pwd.m4 b/config/kernel-set-fs-pwd.m4
index 849e7e6cb..d5565b42c 100644
--- a/config/kernel-set-fs-pwd.m4
+++ b/config/kernel-set-fs-pwd.m4
@@ -2,11 +2,11 @@ dnl #
 dnl # 3.9 API change
 dnl # set_fs_pwd takes const struct path *
 dnl #
-AC_DEFUN([SPL_AC_SET_FS_PWD_WITH_CONST],
+AC_DEFUN([ZFS_AC_KERNEL_SET_FS_PWD_WITH_CONST],
 	tmp_flags="$EXTRA_KCFLAGS"
 	EXTRA_KCFLAGS="-Werror"
 	[AC_MSG_CHECKING([whether set_fs_pwd() requires const struct path *])
-	SPL_LINUX_TRY_COMPILE([
+	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/spinlock.h>
 		#include <linux/fs_struct.h>
 		#include <linux/path.h>
@@ -20,7 +20,7 @@ AC_DEFUN([SPL_AC_SET_FS_PWD_WITH_CONST],
 		AC_DEFINE(HAVE_SET_FS_PWD_WITH_CONST, 1,
 			[set_fs_pwd() needs const path *])
 	],[
-		SPL_LINUX_TRY_COMPILE([
+		ZFS_LINUX_TRY_COMPILE([
 			#include <linux/spinlock.h>
 			#include <linux/fs_struct.h>
 			#include <linux/path.h>
diff --git a/config/kernel-shrink.m4 b/config/kernel-shrink.m4
index a57c2afb0..37da0ec72 100644
--- a/config/kernel-shrink.m4
+++ b/config/kernel-shrink.m4
@@ -131,3 +131,130 @@ AC_DEFUN([ZFS_AC_KERNEL_SHRINK_CONTROL_HAS_NID], [
 		AC_MSG_RESULT(no)
 	])
 ])
+
+
+AC_DEFUN([ZFS_AC_KERNEL_SHRINKER_CALLBACK],[
+	tmp_flags="$EXTRA_KCFLAGS"
+	EXTRA_KCFLAGS="-Werror"
+	dnl #
+	dnl # 2.6.23 to 2.6.34 API change
+	dnl # ->shrink(int nr_to_scan, gfp_t gfp_mask)
+	dnl #
+	AC_MSG_CHECKING([whether old 2-argument shrinker exists])
+	ZFS_LINUX_TRY_COMPILE([
+		#include <linux/mm.h>
+
+		int shrinker_cb(int nr_to_scan, gfp_t gfp_mask);
+	],[
+		struct shrinker cache_shrinker = {
+			.shrink = shrinker_cb,
+			.seeks = DEFAULT_SEEKS,
+		};
+		register_shrinker(&cache_shrinker);
+	],[
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_2ARGS_OLD_SHRINKER_CALLBACK, 1,
+			[old shrinker callback wants 2 args])
+	],[
+		AC_MSG_RESULT(no)
+		dnl #
+		dnl # 2.6.35 - 2.6.39 API change
+		dnl # ->shrink(struct shrinker *,
+		dnl #          int nr_to_scan, gfp_t gfp_mask)
+		dnl #
+		AC_MSG_CHECKING([whether old 3-argument shrinker exists])
+		ZFS_LINUX_TRY_COMPILE([
+			#include <linux/mm.h>
+
+			int shrinker_cb(struct shrinker *, int nr_to_scan,
+					gfp_t gfp_mask);
+		],[
+			struct shrinker cache_shrinker = {
+				.shrink = shrinker_cb,
+				.seeks = DEFAULT_SEEKS,
+			};
+			register_shrinker(&cache_shrinker);
+		],[
+			AC_MSG_RESULT(yes)
+			AC_DEFINE(HAVE_3ARGS_SHRINKER_CALLBACK, 1,
+				[old shrinker callback wants 3 args])
+		],[
+			AC_MSG_RESULT(no)
+			dnl #
+			dnl # 3.0 - 3.11 API change
+			dnl # ->shrink(struct shrinker *,
+			dnl #          struct shrink_control *sc)
+			dnl #
+			AC_MSG_CHECKING(
+				[whether new 2-argument shrinker exists])
+			ZFS_LINUX_TRY_COMPILE([
+				#include <linux/mm.h>
+
+				int shrinker_cb(struct shrinker *,
+						struct shrink_control *sc);
+			],[
+				struct shrinker cache_shrinker = {
+					.shrink = shrinker_cb,
+					.seeks = DEFAULT_SEEKS,
+				};
+				register_shrinker(&cache_shrinker);
+			],[
+				AC_MSG_RESULT(yes)
+				AC_DEFINE(HAVE_2ARGS_NEW_SHRINKER_CALLBACK, 1,
+					[new shrinker callback wants 2 args])
+			],[
+				AC_MSG_RESULT(no)
+				dnl #
+				dnl # 3.12 API change,
+				dnl # ->shrink() is logically split in to
+				dnl # ->count_objects() and ->scan_objects()
+				dnl #
+				AC_MSG_CHECKING(
+				    [whether ->count_objects callback exists])
+				ZFS_LINUX_TRY_COMPILE([
+					#include <linux/mm.h>
+
+					unsigned long shrinker_cb(
+						struct shrinker *,
+						struct shrink_control *sc);
+				],[
+					struct shrinker cache_shrinker = {
+						.count_objects = shrinker_cb,
+						.scan_objects = shrinker_cb,
+						.seeks = DEFAULT_SEEKS,
+					};
+					register_shrinker(&cache_shrinker);
+				],[
+					AC_MSG_RESULT(yes)
+					AC_DEFINE(HAVE_SPLIT_SHRINKER_CALLBACK,
+						1, [->count_objects exists])
+				],[
+					AC_MSG_ERROR(error)
+				])
+			])
+		])
+	])
+	EXTRA_KCFLAGS="$tmp_flags"
+])
+
+dnl #
+dnl # 2.6.39 API change,
+dnl # Shrinker adjust to use common shrink_control structure.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SHRINK_CONTROL_STRUCT], [
+	AC_MSG_CHECKING([whether struct shrink_control exists])
+	ZFS_LINUX_TRY_COMPILE([
+		#include <linux/mm.h>
+	],[
+		struct shrink_control sc __attribute__ ((unused));
+
+		sc.nr_to_scan = 0;
+		sc.gfp_mask = GFP_KERNEL;
+	],[
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_SHRINK_CONTROL_STRUCT, 1,
+			[struct shrink_control exists])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])
diff --git a/config/kernel-shrinker.m4 b/config/kernel-shrinker.m4
deleted file mode 100644
index 6fc9b5422..000000000
--- a/config/kernel-shrinker.m4
+++ /dev/null
@@ -1,125 +0,0 @@
-AC_DEFUN([SPL_AC_SHRINKER_CALLBACK],[
-	tmp_flags="$EXTRA_KCFLAGS"
-	EXTRA_KCFLAGS="-Werror"
-	dnl #
-	dnl # 2.6.23 to 2.6.34 API change
-	dnl # ->shrink(int nr_to_scan, gfp_t gfp_mask)
-	dnl #
-	AC_MSG_CHECKING([whether old 2-argument shrinker exists])
-	SPL_LINUX_TRY_COMPILE([
-		#include <linux/mm.h>
-
-		int shrinker_cb(int nr_to_scan, gfp_t gfp_mask);
-	],[
-		struct shrinker cache_shrinker = {
-			.shrink = shrinker_cb,
-			.seeks = DEFAULT_SEEKS,
-		};
-		register_shrinker(&cache_shrinker);
-	],[
-		AC_MSG_RESULT(yes)
-		AC_DEFINE(HAVE_2ARGS_OLD_SHRINKER_CALLBACK, 1,
-			[old shrinker callback wants 2 args])
-	],[
-		AC_MSG_RESULT(no)
-		dnl #
-		dnl # 2.6.35 - 2.6.39 API change
-		dnl # ->shrink(struct shrinker *,
-		dnl #          int nr_to_scan, gfp_t gfp_mask)
-		dnl #
-		AC_MSG_CHECKING([whether old 3-argument shrinker exists])
-		SPL_LINUX_TRY_COMPILE([
-			#include <linux/mm.h>
-
-			int shrinker_cb(struct shrinker *, int nr_to_scan,
-					gfp_t gfp_mask);
-		],[
-			struct shrinker cache_shrinker = {
-				.shrink = shrinker_cb,
-				.seeks = DEFAULT_SEEKS,
-			};
-			register_shrinker(&cache_shrinker);
-		],[
-			AC_MSG_RESULT(yes)
-			AC_DEFINE(HAVE_3ARGS_SHRINKER_CALLBACK, 1,
-				[old shrinker callback wants 3 args])
-		],[
-			AC_MSG_RESULT(no)
-			dnl #
-			dnl # 3.0 - 3.11 API change
-			dnl # ->shrink(struct shrinker *,
-			dnl #          struct shrink_control *sc)
-			dnl #
-			AC_MSG_CHECKING(
-				[whether new 2-argument shrinker exists])
-			SPL_LINUX_TRY_COMPILE([
-				#include <linux/mm.h>
-
-				int shrinker_cb(struct shrinker *,
-						struct shrink_control *sc);
-			],[
-				struct shrinker cache_shrinker = {
-					.shrink = shrinker_cb,
-					.seeks = DEFAULT_SEEKS,
-				};
-				register_shrinker(&cache_shrinker);
-			],[
-				AC_MSG_RESULT(yes)
-				AC_DEFINE(HAVE_2ARGS_NEW_SHRINKER_CALLBACK, 1,
-					[new shrinker callback wants 2 args])
-			],[
-				AC_MSG_RESULT(no)
-				dnl #
-				dnl # 3.12 API change,
-				dnl # ->shrink() is logically split in to
-				dnl # ->count_objects() and ->scan_objects()
-				dnl #
-				AC_MSG_CHECKING(
-				    [whether ->count_objects callback exists])
-				SPL_LINUX_TRY_COMPILE([
-					#include <linux/mm.h>
-
-					unsigned long shrinker_cb(
-						struct shrinker *,
-						struct shrink_control *sc);
-				],[
-					struct shrinker cache_shrinker = {
-						.count_objects = shrinker_cb,
-						.scan_objects = shrinker_cb,
-						.seeks = DEFAULT_SEEKS,
-					};
-					register_shrinker(&cache_shrinker);
-				],[
-					AC_MSG_RESULT(yes)
-					AC_DEFINE(HAVE_SPLIT_SHRINKER_CALLBACK,
-						1, [->count_objects exists])
-				],[
-					AC_MSG_ERROR(error)
-				])
-			])
-		])
-	])
-	EXTRA_KCFLAGS="$tmp_flags"
-])
-
-dnl #
-dnl # 2.6.39 API change,
-dnl # Shrinker adjust to use common shrink_control structure.
-dnl #
-AC_DEFUN([SPL_AC_SHRINK_CONTROL_STRUCT], [
-	AC_MSG_CHECKING([whether struct shrink_control exists])
-	SPL_LINUX_TRY_COMPILE([
-		#include <linux/mm.h>
-	],[
-		struct shrink_control sc __attribute__ ((unused));
-
-		sc.nr_to_scan = 0;
-		sc.gfp_mask = GFP_KERNEL;
-	],[
-		AC_MSG_RESULT(yes)
-		AC_DEFINE(HAVE_SHRINK_CONTROL_STRUCT, 1,
-			[struct shrink_control exists])
-	],[
-		AC_MSG_RESULT(no)
-	])
-])
diff --git a/config/kernel-spinlock.m4 b/config/kernel-spinlock.m4
index 136262d0e..d6d664007 100644
--- a/config/kernel-spinlock.m4
+++ b/config/kernel-spinlock.m4
@@ -3,11 +3,11 @@ dnl # 2.6.36 API change,
 dnl # The 'struct fs_struct->lock' was changed from a rwlock_t to
 dnl # a spinlock_t to improve the fastpath performance.
 dnl #
-AC_DEFUN([SPL_AC_FS_STRUCT_SPINLOCK], [
+AC_DEFUN([ZFS_AC_KERNEL_FS_STRUCT_SPINLOCK], [
 	AC_MSG_CHECKING([whether struct fs_struct uses spinlock_t])
 	tmp_flags="$EXTRA_KCFLAGS"
 	EXTRA_KCFLAGS="-Werror"
-	SPL_LINUX_TRY_COMPILE([
+	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/sched.h>
 		#include <linux/fs_struct.h>
 	],[
diff --git a/config/kernel-timer.m4 b/config/kernel-timer.m4
index 93b5158b9..4dc3f84ed 100644
--- a/config/kernel-timer.m4
+++ b/config/kernel-timer.m4
@@ -6,11 +6,11 @@ dnl # (older kernels).  Also sanity check the from_timer() and timer_setup()
 dnl # macros are available as well, since they will be used in the same newer
 dnl # kernels that support the new timer_list.func signature.
 dnl #
-AC_DEFUN([SPL_AC_KERNEL_TIMER_FUNCTION_TIMER_LIST], [
+AC_DEFUN([ZFS_AC_KERNEL_TIMER_FUNCTION_TIMER_LIST], [
 	AC_MSG_CHECKING([whether timer_list.function gets a timer_list])
 	tmp_flags="$EXTRA_KCFLAGS"
 	EXTRA_KCFLAGS="-Werror"
-	SPL_LINUX_TRY_COMPILE([
+	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/timer.h>
 		void task_expire(struct timer_list *tl) {}
 	],[
diff --git a/config/kernel-trim-unused-symbols.m4 b/config/kernel-trim-unused-symbols.m4
deleted file mode 100644
index d1ac2f3c8..000000000
--- a/config/kernel-trim-unused-symbols.m4
+++ /dev/null
@@ -1,19 +0,0 @@
-dnl #
-dnl # config trim unused symbols,
-dnl # Verify the kernel has CONFIG_TRIM_UNUSED_KSYMS DISABLED.
-dnl #
-AC_DEFUN([SPL_AC_CONFIG_TRIM_UNUSED_KSYMS], [
-	AC_MSG_CHECKING([whether CONFIG_TRIM_UNUSED_KSYM is disabled])
-	SPL_LINUX_TRY_COMPILE([
-		#if defined(CONFIG_TRIM_UNUSED_KSYMS)
-		#error CONFIG_TRIM_UNUSED_KSYMS not defined
-		#endif
-	],[ ],[
-		AC_MSG_RESULT([yes])
-	],[
-		AC_MSG_RESULT([no])
-		AC_MSG_ERROR([
-	*** This kernel has unused symbols trimming enabled, please disable.
-	*** Rebuild the kernel with CONFIG_TRIM_UNUSED_KSYMS=n set.])
-	])
-])
diff --git a/config/kernel-urange-sleep.m4 b/config/kernel-urange-sleep.m4
index 85beca6dd..b5764de3e 100644
--- a/config/kernel-urange-sleep.m4
+++ b/config/kernel-urange-sleep.m4
@@ -5,9 +5,9 @@ dnl # usleep_range is a finer precision implementation of msleep
 dnl # designed to be a drop-in replacement for udelay where a precise
 dnl # sleep / busy-wait is unnecessary.
 dnl #
-AC_DEFUN([SPL_AC_USLEEP_RANGE], [
+AC_DEFUN([ZFS_AC_KERNEL_USLEEP_RANGE], [
 	AC_MSG_CHECKING([whether usleep_range() is available])
-	SPL_LINUX_TRY_COMPILE([
+	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/delay.h>
 	],[
 		usleep_range(0, 0);
diff --git a/config/kernel-vfs-fsync.m4 b/config/kernel-vfs-fsync.m4
index 3c42bf1a0..a474f9f17 100644
--- a/config/kernel-vfs-fsync.m4
+++ b/config/kernel-vfs-fsync.m4
@@ -2,9 +2,9 @@ dnl #
 dnl # 2.6.35 API change,
 dnl # Unused 'struct dentry *' removed from vfs_fsync() prototype.
 dnl #
-AC_DEFUN([SPL_AC_2ARGS_VFS_FSYNC], [
+AC_DEFUN([ZFS_AC_KERNEL_2ARGS_VFS_FSYNC], [
 	AC_MSG_CHECKING([whether vfs_fsync() wants 2 args])
-	SPL_LINUX_TRY_COMPILE([
+	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/fs.h>
 	],[
 		vfs_fsync(NULL, 0);
diff --git a/config/kernel-vfs-getattr.m4 b/config/kernel-vfs-getattr.m4
index 7772cb514..b13723538 100644
--- a/config/kernel-vfs-getattr.m4
+++ b/config/kernel-vfs-getattr.m4
@@ -2,9 +2,9 @@ dnl #
 dnl # 4.11 API, a528d35e@torvalds/linux
 dnl # vfs_getattr(const struct path *p, struct kstat *s, u32 m, unsigned int f)
 dnl #
-AC_DEFUN([SPL_AC_4ARGS_VFS_GETATTR], [
+AC_DEFUN([ZFS_AC_KERNEL_4ARGS_VFS_GETATTR], [
 	AC_MSG_CHECKING([whether vfs_getattr() wants 4 args])
-	SPL_LINUX_TRY_COMPILE([
+	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/fs.h>
 	],[
 		vfs_getattr((const struct path *)NULL,
@@ -24,9 +24,9 @@ dnl #
 dnl # 3.9 API
 dnl # vfs_getattr(struct path *p, struct kstat *s)
 dnl #
-AC_DEFUN([SPL_AC_2ARGS_VFS_GETATTR], [
+AC_DEFUN([ZFS_AC_KERNEL_2ARGS_VFS_GETATTR], [
 	AC_MSG_CHECKING([whether vfs_getattr() wants 2 args])
-	SPL_LINUX_TRY_COMPILE([
+	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/fs.h>
 	],[
 		vfs_getattr((struct path *) NULL,
@@ -44,9 +44,9 @@ dnl #
 dnl # <3.9 API
 dnl # vfs_getattr(struct vfsmount *v, struct dentry *d, struct kstat *k)
 dnl #
-AC_DEFUN([SPL_AC_3ARGS_VFS_GETATTR], [
+AC_DEFUN([ZFS_AC_KERNEL_3ARGS_VFS_GETATTR], [
 	AC_MSG_CHECKING([whether vfs_getattr() wants 3 args])
-	SPL_LINUX_TRY_COMPILE([
+	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/fs.h>
 	],[
 		vfs_getattr((struct vfsmount *)NULL,
diff --git a/config/kernel-wait.m4 b/config/kernel-wait.m4
index 5f718a160..d6442c1df 100644
--- a/config/kernel-wait.m4
+++ b/config/kernel-wait.m4
@@ -8,9 +8,9 @@ dnl # of just two functions: one which uses io_schedule() and one which just
 dnl # uses schedule().  This API change was made to consolidate all of those
 dnl # redundant wait functions.
 dnl #
-AC_DEFUN([SPL_AC_WAIT_ON_BIT], [
+AC_DEFUN([ZFS_AC_KERNEL_WAIT_ON_BIT], [
 	AC_MSG_CHECKING([whether wait_on_bit() takes an action])
-	SPL_LINUX_TRY_COMPILE([
+	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/wait.h>
 	],[
 		int (*action)(void *) = NULL;
@@ -26,9 +26,9 @@ dnl #
 dnl # 4.13 API change
 dnl # Renamed struct wait_queue -> struct wait_queue_entry.
 dnl #
-AC_DEFUN([SPL_AC_WAIT_QUEUE_ENTRY_T], [
+AC_DEFUN([ZFS_AC_KERNEL_WAIT_QUEUE_ENTRY_T], [
 	AC_MSG_CHECKING([whether wait_queue_entry_t exists])
-	SPL_LINUX_TRY_COMPILE([
+	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/wait.h>
 	],[
 		wait_queue_entry_t *entry __attribute__ ((unused));
@@ -46,9 +46,9 @@ dnl # 4.13 API change
 dnl # Renamed wait_queue_head::task_list -> wait_queue_head::head
 dnl # Renamed wait_queue_entry::task_list -> wait_queue_entry::entry
 dnl #
-AC_DEFUN([SPL_AC_WAIT_QUEUE_HEAD_ENTRY], [
+AC_DEFUN([ZFS_AC_KERNEL_WAIT_QUEUE_HEAD_ENTRY], [
 	AC_MSG_CHECKING([whether wq_head->head and wq_entry->entry exist])
-	SPL_LINUX_TRY_COMPILE([
+	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/wait.h>
 
 		#ifdef HAVE_WAIT_QUEUE_ENTRY_T
diff --git a/config/kernel-zlib.m4 b/config/kernel-zlib.m4
index bb236466a..3ca7cf682 100644
--- a/config/kernel-zlib.m4
+++ b/config/kernel-zlib.m4
@@ -2,9 +2,9 @@ dnl #
 dnl # zlib inflate compat,
 dnl # Verify the kernel has CONFIG_ZLIB_INFLATE support enabled.
 dnl #
-AC_DEFUN([SPL_AC_CONFIG_ZLIB_INFLATE], [
+AC_DEFUN([ZFS_AC_KERNEL_CONFIG_ZLIB_INFLATE], [
 	AC_MSG_CHECKING([whether CONFIG_ZLIB_INFLATE is defined])
-	SPL_LINUX_TRY_COMPILE([
+	ZFS_LINUX_TRY_COMPILE([
 		#if !defined(CONFIG_ZLIB_INFLATE) && \
 		    !defined(CONFIG_ZLIB_INFLATE_MODULE)
 		#error CONFIG_ZLIB_INFLATE not defined
@@ -23,9 +23,9 @@ dnl #
 dnl # zlib deflate compat,
 dnl # Verify the kernel has CONFIG_ZLIB_DEFLATE support enabled.
 dnl #
-AC_DEFUN([SPL_AC_CONFIG_ZLIB_DEFLATE], [
+AC_DEFUN([ZFS_AC_KERNEL_CONFIG_ZLIB_DEFLATE], [
 	AC_MSG_CHECKING([whether CONFIG_ZLIB_DEFLATE is defined])
-	SPL_LINUX_TRY_COMPILE([
+	ZFS_LINUX_TRY_COMPILE([
 		#if !defined(CONFIG_ZLIB_DEFLATE) && \
 		    !defined(CONFIG_ZLIB_DEFLATE_MODULE)
 		#error CONFIG_ZLIB_DEFLATE not defined
@@ -47,9 +47,9 @@ dnl # This was done to avoid always having to allocate the maximum size
 dnl # workspace (268K).  The caller can now specific the windowBits and
 dnl # memLevel compression parameters to get a smaller workspace.
 dnl #
-AC_DEFUN([SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE],
+AC_DEFUN([ZFS_AC_KERNEL_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE],
 	[AC_MSG_CHECKING([whether zlib_deflate_workspacesize() wants 2 args])
-	SPL_LINUX_TRY_COMPILE([
+	ZFS_LINUX_TRY_COMPILE([
 		#include <linux/zlib.h>
 	],[
 		return zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL);
diff --git a/config/kernel.m4 b/config/kernel.m4
index e3daeffa8..8151cdc22 100644
--- a/config/kernel.m4
+++ b/config/kernel.m4
@@ -3,12 +3,39 @@ dnl # Default ZFS kernel configuration
 dnl #
 AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
 	ZFS_AC_KERNEL
-	ZFS_AC_SPL
 	ZFS_AC_QAT
 	ZFS_AC_TEST_MODULE
 	ZFS_AC_KERNEL_MISC_MINOR
 	ZFS_AC_KERNEL_OBJTOOL
 	ZFS_AC_KERNEL_CONFIG
+	ZFS_AC_KERNEL_CTL_NAME
+	ZFS_AC_KERNEL_PDE_DATA
+	ZFS_AC_KERNEL_SET_FS_PWD_WITH_CONST
+	ZFS_AC_KERNEL_2ARGS_VFS_FSYNC
+	ZFS_AC_KERNEL_FS_STRUCT_SPINLOCK
+	ZFS_AC_KERNEL_KUIDGID_T
+	ZFS_AC_KERNEL_FALLOCATE
+	ZFS_AC_KERNEL_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
+	ZFS_AC_KERNEL_RWSEM_SPINLOCK_IS_RAW
+	ZFS_AC_KERNEL_RWSEM_ACTIVITY
+	ZFS_AC_KERNEL_RWSEM_ATOMIC_LONG_COUNT
+	ZFS_AC_KERNEL_SCHED_RT_HEADER
+	ZFS_AC_KERNEL_SCHED_SIGNAL_HEADER
+	ZFS_AC_KERNEL_IO_SCHEDULE_TIMEOUT
+	ZFS_AC_KERNEL_4ARGS_VFS_GETATTR
+	ZFS_AC_KERNEL_3ARGS_VFS_GETATTR
+	ZFS_AC_KERNEL_2ARGS_VFS_GETATTR
+	ZFS_AC_KERNEL_USLEEP_RANGE
+	ZFS_AC_KERNEL_KMEM_CACHE_ALLOCFLAGS
+	ZFS_AC_KERNEL_KMEM_CACHE_CREATE_USERCOPY
+	ZFS_AC_KERNEL_WAIT_ON_BIT
+	ZFS_AC_KERNEL_WAIT_QUEUE_ENTRY_T
+	ZFS_AC_KERNEL_WAIT_QUEUE_HEAD_ENTRY
+	ZFS_AC_KERNEL_INODE_LOCK
+	ZFS_AC_KERNEL_GROUP_INFO_GID
+	ZFS_AC_KERNEL_WRITE
+	ZFS_AC_KERNEL_READ
+	ZFS_AC_KERNEL_TIMER_FUNCTION_TIMER_LIST
 	ZFS_AC_KERNEL_DECLARE_EVENT_CLASS
 	ZFS_AC_KERNEL_CURRENT_BIO_TAIL
 	ZFS_AC_KERNEL_SUPER_USER_NS
@@ -106,6 +133,8 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
 	ZFS_AC_KERNEL_FST_MOUNT
 	ZFS_AC_KERNEL_SHRINK
 	ZFS_AC_KERNEL_SHRINK_CONTROL_HAS_NID
+	ZFS_AC_KERNEL_SHRINK_CONTROL_STRUCT
+	ZFS_AC_KERNEL_SHRINKER_CALLBACK
 	ZFS_AC_KERNEL_S_INSTANCES_LIST_HEAD
 	ZFS_AC_KERNEL_S_D_OP
 	ZFS_AC_KERNEL_BDI
@@ -275,204 +304,6 @@ AC_DEFUN([ZFS_AC_KERNEL], [
 	ZFS_AC_MODULE_SYMVERS
 ])
 
-
-dnl #
-dnl # Detect the SPL module to be built against
-dnl #
-AC_DEFUN([ZFS_AC_SPL], [
-	AC_ARG_WITH([spl],
-		AS_HELP_STRING([--with-spl=PATH],
-		[Path to spl source]),
-		AS_IF([test "$withval" = "yes"],
-			AC_MSG_ERROR([--with-spl=PATH requires a PATH]),
-			[splsrc="$withval"]))
-
-	AC_ARG_WITH([spl-obj],
-		AS_HELP_STRING([--with-spl-obj=PATH],
-		[Path to spl build objects]),
-		[splbuild="$withval"])
-
-	AC_ARG_WITH([spl-timeout],
-		AS_HELP_STRING([--with-spl-timeout=SECS],
-		[Wait SECS for SPL header and symver file @<:@default=0@:>@]),
-		[timeout="$withval"], [timeout=0])
-
-	dnl #
-	dnl # The existence of spl.release.in is used to identify a valid
-	dnl # source directory.  In order of preference:
-	dnl #
-	splsrc0="/var/lib/dkms/spl/${VERSION}/build"
-	splsrc1="/usr/local/src/spl-${VERSION}/${LINUX_VERSION}"
-	splsrc2="/usr/local/src/spl-${VERSION}"
-	splsrc3="/usr/src/spl-${VERSION}/${LINUX_VERSION}"
-	splsrc4="/usr/src/spl-${VERSION}"
-	splsrc5="../spl/"
-	splsrc6="$LINUX"
-
-	AC_MSG_CHECKING([spl source directory])
-	AS_IF([test -z "${splsrc}"], [
-		[all_spl_sources="
-		${splsrc0}
-		${splsrc1}
-		${splsrc2}
-		${splsrc3}
-		${splsrc4}
-		${splsrc5}
-		${splsrc6}"],
-		AS_IF([ test -e "${splsrc0}/spl.release.in"], [
-			splsrc=${splsrc0}
-		], [ test -e "${splsrc1}/spl.release.in"], [
-			splsrc=${splsrc1}
-		], [ test -e "${splsrc2}/spl.release.in"], [
-			splsrc=${splsrc2}
-		], [ test -e "${splsrc3}/spl.release.in"], [
-			splsrc=$(readlink -f "${splsrc3}")
-		], [ test -e "${splsrc4}/spl.release.in" ], [
-			splsrc=${splsrc4}
-		], [ test -e "${splsrc5}/spl.release.in"], [
-			splsrc=$(readlink -f "${splsrc5}")
-		], [ test -e "${splsrc6}/spl.release.in" ], [
-			splsrc=${splsrc6}
-		], [
-			splsrc="[Not found]"
-		])
-	], [
-		[all_spl_sources="$withval"],
-		AS_IF([test "$splsrc" = "NONE"], [
-			splbuild=NONE
-			splsrcver=NONE
-		])
-	])
-
-	AC_MSG_RESULT([$splsrc])
-	AS_IF([ test ! -e "$splsrc/spl.release.in"], [
-		AC_MSG_ERROR([
-	*** Please make sure the kmod spl devel package for your distribution
-	*** is installed then try again.  If that fails you can specify the
-	*** location of the spl source with the '--with-spl=PATH' option.
-	*** The spl version must match the version of ZFS you are building,
-	*** ${VERSION}.  Failed to find spl.release.in in the following:
-	$all_spl_sources])
-	])
-
-	dnl #
-	dnl # The existence of the spl_config.h is used to identify a valid
-	dnl # spl object directory.  In many cases the object and source
-	dnl # directory are the same, however the objects may also reside
-	dnl # is a subdirectory named after the kernel version.
-	dnl #
-	dnl # This file is supposed to be available after DKMS finishes
-	dnl # building the SPL kernel module for the target kernel.  The
-	dnl # '--with-spl-timeout' option can be passed to pause here,
-	dnl # waiting for the file to appear from a concurrently building
-	dnl # SPL package.
-	dnl #
-	AC_MSG_CHECKING([spl build directory])
-
-	all_spl_config_locs="${splsrc}/${LINUX_VERSION}
-	${splsrc}"
-
-	while true; do
-		AS_IF([test -z "$splbuild"], [
-			AS_IF([ test -e "${splsrc}/${LINUX_VERSION}/spl_config.h" ], [
-				splbuild="${splsrc}/${LINUX_VERSION}"
-			], [ test -e "${splsrc}/spl_config.h" ], [
-				splbuild="${splsrc}"
-			], [ find -L "${splsrc}" -name spl_config.h 2> /dev/null | grep -wq spl_config.h ], [
-				splbuild=$(find -L "${splsrc}" -name spl_config.h | sed 's,/spl_config.h,,')
-			], [
-				splbuild="[Not found]"
-			])
-		])
-		AS_IF([test -e "$splbuild/spl_config.h" -o $timeout -le 0], [
-			break;
-		], [
-			sleep 1
-			timeout=$((timeout-1))
-		])
-	done
-
-	AC_MSG_RESULT([$splbuild])
-	AS_IF([ ! test -e "$splbuild/spl_config.h"], [
-		AC_MSG_ERROR([
-	*** Please make sure the kmod spl devel <kernel> package for your
-	*** distribution is installed then try again.  If that fails you
-	*** can specify the location of the spl objects with the
-	*** '--with-spl-obj=PATH' option.  Failed to find spl_config.h in
-	*** any of the following:
-	$all_spl_config_locs])
-	])
-
-	AC_MSG_CHECKING([spl source version])
-	AS_IF([test -r $splbuild/spl_config.h &&
-		fgrep -q SPL_META_VERSION $splbuild/spl_config.h], [
-
-		splsrcver=`(echo "#include <spl_config.h>";
-		            echo "splsrcver=SPL_META_VERSION-SPL_META_RELEASE") |
-		            cpp -I $splbuild |
-		            grep "^splsrcver=" | tr -d \" | cut -d= -f2`
-	])
-
-	AS_IF([test -z "$splsrcver"], [
-		AC_MSG_RESULT([Not found])
-		AC_MSG_ERROR([
-	*** Cannot determine the version of the spl source.
-	*** Please prepare the spl source before running this script])
-	])
-
-	AC_MSG_RESULT([$splsrcver])
-
-	SPL=${splsrc}
-	SPL_OBJ=${splbuild}
-	SPL_VERSION=${splsrcver}
-
-	AC_SUBST(SPL)
-	AC_SUBST(SPL_OBJ)
-	AC_SUBST(SPL_VERSION)
-
-	dnl #
-	dnl # Detect the name used for the SPL Module.symvers file.  If one
-	dnl # does not exist this is likely because the SPL has been configured
-	dnl # but not built.  The '--with-spl-timeout' option can be passed
-	dnl # to pause here, waiting for the file to appear from a concurrently
-	dnl # building SPL package.  If the file does not appear in time, a good
-	dnl # guess is made as to what this file will be named based on what it
-	dnl # is named in the kernel build products.  This file will first be
-	dnl # used at link time so if the guess is wrong the build will fail
-	dnl # then.  This unfortunately means the ZFS package does not contain a
-	dnl # reliable mechanism to detect symbols exported by the SPL at
-	dnl # configure time.
-	dnl #
-	AC_MSG_CHECKING([spl file name for module symbols])
-	SPL_SYMBOLS=NONE
-
-	while true; do
-		AS_IF([test -r $SPL_OBJ/Module.symvers], [
-			SPL_SYMBOLS=Module.symvers
-		], [test -r $SPL_OBJ/Modules.symvers], [
-			SPL_SYMBOLS=Modules.symvers
-		], [test -r $SPL_OBJ/module/Module.symvers], [
-			SPL_SYMBOLS=Module.symvers
-		], [test -r $SPL_OBJ/module/Modules.symvers], [
-			SPL_SYMBOLS=Modules.symvers
-		])
-
-		AS_IF([test $SPL_SYMBOLS != NONE -o $timeout -le 0], [
-			break;
-		], [
-			sleep 1
-			timeout=$((timeout-1))
-		])
-	done
-
-	AS_IF([test "$SPL_SYMBOLS" = NONE], [
-		SPL_SYMBOLS=$LINUX_SYMBOLS
-	])
-
-	AC_MSG_RESULT([$SPL_SYMBOLS])
-	AC_SUBST(SPL_SYMBOLS)
-])
-
 dnl #
 dnl # Detect the QAT module to be built against
 dnl # QAT provides hardware acceleration for data compression:
@@ -603,6 +434,9 @@ AC_DEFUN([ZFS_AC_KERNEL_CONFIG], [
 
 	ZFS_AC_KERNEL_CONFIG_THREAD_SIZE
 	ZFS_AC_KERNEL_CONFIG_DEBUG_LOCK_ALLOC
+	ZFS_AC_KERNEL_CONFIG_TRIM_UNUSED_KSYMS
+	ZFS_AC_KERNEL_CONFIG_ZLIB_INFLATE
+	ZFS_AC_KERNEL_CONFIG_ZLIB_DEFLATE
 ])
 
 dnl #
@@ -673,6 +507,27 @@ AC_DEFUN([ZFS_AC_KERNEL_CONFIG_DEBUG_LOCK_ALLOC], [
 ])
 
 dnl #
+dnl # Check CONFIG_TRIM_UNUSED_KSYMS
+dnl #
+dnl # Verify the kernel has CONFIG_TRIM_UNUSED_KSYMS disabled.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_CONFIG_TRIM_UNUSED_KSYMS], [
+	AC_MSG_CHECKING([whether CONFIG_TRIM_UNUSED_KSYM is disabled])
+	ZFS_LINUX_TRY_COMPILE([
+		#if defined(CONFIG_TRIM_UNUSED_KSYMS)
+		#error CONFIG_TRIM_UNUSED_KSYMS not defined
+		#endif
+	],[ ],[
+		AC_MSG_RESULT([yes])
+	],[
+		AC_MSG_RESULT([no])
+		AC_MSG_ERROR([
+	*** This kernel has unused symbols trimming enabled, please disable.
+	*** Rebuild the kernel with CONFIG_TRIM_UNUSED_KSYMS=n set.])
+	])
+])
+
+dnl #
 dnl # ZFS_LINUX_CONFTEST_H
 dnl #
 AC_DEFUN([ZFS_LINUX_CONFTEST_H], [
diff --git a/config/zfs-build.m4 b/config/zfs-build.m4
index 49a4096d6..1d47b0384 100644
--- a/config/zfs-build.m4
+++ b/config/zfs-build.m4
@@ -95,6 +95,63 @@ AC_DEFUN([ZFS_AC_DEBUGINFO], [
 	AC_MSG_RESULT([$enable_debuginfo])
 ])
 
+dnl #
+dnl # Disabled by default, provides basic memory tracking.  Track the total
+dnl # number of bytes allocated with kmem_alloc() and freed with kmem_free().
+dnl # Then at module unload time if any bytes were leaked it will be reported
+dnl # on the console.
+dnl #
+AC_DEFUN([ZFS_AC_DEBUG_KMEM], [
+	AC_MSG_CHECKING([whether basic kmem accounting is enabled])
+	AC_ARG_ENABLE([debug-kmem],
+		[AS_HELP_STRING([--enable-debug-kmem],
+		[Enable basic kmem accounting @<:@default=no@:>@])],
+		[],
+		[enable_debug_kmem=no])
+
+	AS_IF([test "x$enable_debug_kmem" = xyes], [
+		KERNEL_DEBUG_CPPFLAGS+=" -DDEBUG_KMEM"
+		DEBUG_KMEM_ZFS="_with_debug_kmem"
+	], [
+		DEBUG_KMEM_ZFS="_without_debug_kmem"
+	])
+
+	AC_SUBST(KERNEL_DEBUG_CPPFLAGS)
+	AC_SUBST(DEBUG_KMEM_ZFS)
+
+	AC_MSG_RESULT([$enable_debug_kmem])
+])
+
+dnl #
+dnl # Disabled by default, provides detailed memory tracking.  This feature
+dnl # also requires --enable-debug-kmem to be set.  When enabled not only will
+dnl # total bytes be tracked but also the location of every kmem_alloc() and
+dnl # kmem_free().  When the module is unloaded a list of all leaked addresses
+dnl # and where they were allocated will be dumped to the console.  Enabling
+dnl # this feature has a significant impact on performance but it makes finding
+dnl # memory leaks straight forward.
+dnl #
+AC_DEFUN([ZFS_AC_DEBUG_KMEM_TRACKING], [
+	AC_MSG_CHECKING([whether detailed kmem tracking is enabled])
+	AC_ARG_ENABLE([debug-kmem-tracking],
+		[AS_HELP_STRING([--enable-debug-kmem-tracking],
+		[Enable detailed kmem tracking  @<:@default=no@:>@])],
+		[],
+		[enable_debug_kmem_tracking=no])
+
+	AS_IF([test "x$enable_debug_kmem_tracking" = xyes], [
+		KERNEL_DEBUG_CPPFLAGS+=" -DDEBUG_KMEM_TRACKING"
+		DEBUG_KMEM_TRACKING_ZFS="_with_debug_kmem_tracking"
+	], [
+		DEBUG_KMEM_TRACKING_ZFS="_without_debug_kmem_tracking"
+	])
+
+	AC_SUBST(KERNEL_DEBUG_CPPFLAGS)
+	AC_SUBST(DEBUG_KMEM_TRACKING_ZFS)
+
+	AC_MSG_RESULT([$enable_debug_kmem_tracking])
+])
+
 AC_DEFUN([ZFS_AC_CONFIG_ALWAYS], [
 	ZFS_AC_CONFIG_ALWAYS_CC_NO_UNUSED_BUT_SET_VARIABLE
 	ZFS_AC_CONFIG_ALWAYS_CC_NO_BOOL_COMPARE
@@ -183,10 +240,11 @@ AC_DEFUN([ZFS_AC_RPM], [
 	])
 
 	RPM_DEFINE_COMMON='--define "$(DEBUG_ZFS) 1"'
+	RPM_DEFINE_COMMON+=' --define "$(DEBUG_KMEM_ZFS) 1"'
+	RPM_DEFINE_COMMON+=' --define "$(DEBUG_KMEM_TRACKING_ZFS) 1"'
 	RPM_DEFINE_COMMON+=' --define "$(DEBUGINFO_ZFS) 1"'
 	RPM_DEFINE_COMMON+=' --define "$(ASAN_ZFS) 1"'
 
-
 	RPM_DEFINE_UTIL=' --define "_initconfdir $(DEFAULT_INITCONF_DIR)"'
 
 	dnl # Make the next three RPM_DEFINE_UTIL additions conditional, since
@@ -221,8 +279,6 @@ AC_DEFUN([ZFS_AC_RPM], [
 	])
 
 	RPM_DEFINE_KMOD='--define "kernels $(LINUX_VERSION)"'
-	RPM_DEFINE_KMOD+=' --define "require_spldir $(SPL)"'
-	RPM_DEFINE_KMOD+=' --define "require_splobj $(SPL_OBJ)"'
 	RPM_DEFINE_KMOD+=' --define "ksrc $(LINUX)"'
 	RPM_DEFINE_KMOD+=' --define "kobj $(LINUX_OBJ)"'
 	RPM_DEFINE_KMOD+=' --define "_wrong_version_format_terminate_build 0"'
diff --git a/config/zfs-meta.m4 b/config/zfs-meta.m4
index 3e1429d99..aa0fc1420 100644
--- a/config/zfs-meta.m4
+++ b/config/zfs-meta.m4
@@ -60,9 +60,12 @@ AC_DEFUN([ZFS_AC_META], [
 
 		ZFS_META_VERSION=_ZFS_AC_META_GETVAL([Version]);
 		if test -n "$ZFS_META_VERSION"; then
-			AC_DEFINE_UNQUOTED([ZFS_META_VERSION], ["$ZFS_META_VERSION"],
-				[Define the project version.]
-			)
+			AC_DEFINE_UNQUOTED([ZFS_META_VERSION],
+			    ["$ZFS_META_VERSION"],
+			    [Define the project version.])
+			AC_DEFINE_UNQUOTED([SPL_META_VERSION],
+			    [ZFS_META_VERSION],
+			    [Defined for legacy compatibility.])
 			AC_SUBST([ZFS_META_VERSION])
 		fi
 
@@ -86,9 +89,12 @@ AC_DEFUN([ZFS_AC_META], [
 		fi
 
 		if test -n "$ZFS_META_RELEASE"; then
-			AC_DEFINE_UNQUOTED([ZFS_META_RELEASE], ["$ZFS_META_RELEASE"],
-				[Define the project release.]
-			)
+			AC_DEFINE_UNQUOTED([ZFS_META_RELEASE],
+			     ["$ZFS_META_RELEASE"],
+			     [Define the project release.])
+			AC_DEFINE_UNQUOTED([SPL_META_RELEASE],
+			    [ZFS_META_RELEASE],
+			    [Defined for legacy compatibility.])
 			AC_SUBST([ZFS_META_RELEASE])
 
 			RELEASE="$ZFS_META_RELEASE"
@@ -108,9 +114,11 @@ AC_DEFUN([ZFS_AC_META], [
 				test -n "$ZFS_META_RELEASE" && 
 				        ZFS_META_ALIAS="$ZFS_META_ALIAS-$ZFS_META_RELEASE"
 				AC_DEFINE_UNQUOTED([ZFS_META_ALIAS],
-					["$ZFS_META_ALIAS"],
-					[Define the project alias string.] 
-				)
+				    ["$ZFS_META_ALIAS"],
+				    [Define the project alias string.])
+				AC_DEFINE_UNQUOTED([SPL_META_ALIAS],
+				    [ZFS_META_ALIAS],
+				    [Defined for legacy compatibility.])
 				AC_SUBST([ZFS_META_ALIAS])
 		fi