Provide kfpu_begin/end from spl

Jira: NAS-115648

config/kernel-fpu.m4

@@ -62,7 +62,7 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_FPU], [
 	], [
 		kernel_fpu_begin();
 		kernel_fpu_end();
-	], [], [ZFS_META_LICENSE])
+	], [], [])
 
 	ZFS_LINUX_TEST_SRC([__kernel_fpu], [
 		#include <linux/types.h>
@@ -77,7 +77,7 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_FPU], [
 	], [
 		__kernel_fpu_begin();
 		__kernel_fpu_end();
-	], [], [ZFS_META_LICENSE])
+	], [], [])
 
 	ZFS_LINUX_TEST_SRC([kernel_neon], [
 		#include <asm/neon.h>
@@ -92,7 +92,7 @@ AC_DEFUN([ZFS_AC_KERNEL_FPU], [
 	dnl # Legacy kernel
 	dnl #
 	AC_MSG_CHECKING([whether kernel fpu is available])
-	ZFS_LINUX_TEST_RESULT([kernel_fpu_license], [
+	ZFS_LINUX_TEST_RESULT([kernel_fpu], [
 		AC_MSG_RESULT(kernel_fpu_*)
 		AC_DEFINE(HAVE_KERNEL_FPU, 1,
 		    [kernel has kernel_fpu_* functions])
@@ -102,7 +102,7 @@ AC_DEFUN([ZFS_AC_KERNEL_FPU], [
 		dnl #
 		dnl # Linux 4.2 kernel
 		dnl #
-		ZFS_LINUX_TEST_RESULT_SYMBOL([__kernel_fpu_license],
+		ZFS_LINUX_TEST_RESULT_SYMBOL([__kernel_fpu],
 		    [__kernel_fpu_begin],
 		    [arch/x86/kernel/fpu/core.c arch/x86/kernel/i387.c], [
 			AC_MSG_RESULT(__kernel_fpu_*)

include/os/linux/kernel/linux/simd_x86.h

@@ -106,29 +106,8 @@
 #define	kfpu_init()		0
 #define	kfpu_fini()		((void) 0)
 
-#if defined(HAVE_UNDERSCORE_KERNEL_FPU)
-#define	kfpu_begin()		\
-{				\
-	preempt_disable();	\
-	__kernel_fpu_begin();	\
-}
-#define	kfpu_end()		\
-{				\
-	__kernel_fpu_end();	\
-	preempt_enable();	\
-}
-
-#elif defined(HAVE_KERNEL_FPU)
-#define	kfpu_begin()		kernel_fpu_begin()
-#define	kfpu_end()		kernel_fpu_end()
-
-#else
-/*
- * This case is unreachable.  When KERNEL_EXPORTS_X86_FPU is defined then
- * either HAVE_UNDERSCORE_KERNEL_FPU or HAVE_KERNEL_FPU must be defined.
- */
-#error "Unreachable kernel configuration"
-#endif
+extern void kfpu_begin(void);
+extern void kfpu_end(void);
 
 #else /* defined(KERNEL_EXPORTS_X86_FPU) */
 

module/Kbuild.in

@@ -74,6 +74,7 @@ SPL_OBJS := \
 	spl-cred.o \
 	spl-err.o \
 	spl-generic.o \
+	spl-kfpu.o \
 	spl-kmem-cache.o \
 	spl-kmem.o \
 	spl-kstat.o \

module/os/linux/spl/spl-kfpu.c

@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2022 iXsystems, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifdef KERNEL_EXPORTS_X86_FPU
+
+#include <sys/simd.h>
+
+#if defined(HAVE_KERNEL_FPU)
+
+void
+// cppcheck-suppress syntaxError
+kfpu_begin(void)
+{
+	kernel_fpu_begin();
+}
+
+void
+// cppcheck-suppress syntaxError
+kfpu_end(void)
+{
+	kernel_fpu_end();
+}
+
+#elif defined(HAVE_UNDERSCORE_KERNEL_FPU)
+
+void
+// cppcheck-suppress syntaxError
+kfpu_begin(void)
+{
+	preempt_disable();
+	__kernel_fpu_begin();
+}
+
+void
+// cppcheck-suppress syntaxError
+kfpu_end(void)
+{
+	__kernel_fpu_end();
+	preempt_enable();
+}
+
+#else
+/*
+ * This case should be unreachable.  When KERNEL_EXPORTS_X86_FPU is defined
+ * then either HAVE_UNDERSCORE_KERNEL_FPU or HAVE_KERNEL_FPU must be defined.
+ */
+#error "Unreachable kernel configuration"
+#endif
+
+EXPORT_SYMBOL(kfpu_begin);
+EXPORT_SYMBOL(kfpu_end);
+
+#endif /* KERNEL_EXPORTS_X86_FPU */