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dnl #
dnl # Handle differences in kernel FPU code.
dnl #
dnl # Kernel
dnl # 5.19: The asm/fpu/internal.h header was removed, it has been
dnl # effectively empty since the 5.16 kernel.
dnl #
dnl # 5.11: kernel_fpu_begin() is an inlined function now, so don't check
dnl # for it inside the kernel symbols.
dnl #
dnl # 5.0: Wrappers have been introduced to save/restore the FPU state.
dnl # This change was made to the 4.19.38 and 4.14.120 LTS kernels.
dnl # HAVE_KERNEL_FPU_INTERNAL
dnl #
dnl # 4.2: Use __kernel_fpu_{begin,end}()
dnl # HAVE_UNDERSCORE_KERNEL_FPU & KERNEL_EXPORTS_X86_FPU
dnl #
dnl # Pre-4.2: Use kernel_fpu_{begin,end}()
dnl # HAVE_KERNEL_FPU & KERNEL_EXPORTS_X86_FPU
dnl #
dnl # N.B. The header check is performed before all other checks since it
dnl # depends on HAVE_KERNEL_FPU_API_HEADER being set in confdefs.h.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_FPU_HEADER], [
AC_MSG_CHECKING([whether fpu headers are available])
ZFS_LINUX_TRY_COMPILE([
#include <linux/module.h>
#include <asm/fpu/api.h>
],[
],[
AC_DEFINE(HAVE_KERNEL_FPU_API_HEADER, 1,
[kernel has asm/fpu/api.h])
ZFS_LINUX_TRY_COMPILE([
#include <linux/module.h>
#include <asm/fpu/internal.h>
],[
],[
AC_DEFINE(HAVE_KERNEL_FPU_INTERNAL_HEADER, 1,
[kernel has asm/fpu/internal.h])
AC_MSG_RESULT([asm/fpu/api.h asm/fpu/internal.h])
],[
AC_MSG_RESULT([asm/fpu/api.h])
])
],[
AC_MSG_RESULT([i387.h])
])
])
AC_DEFUN([ZFS_AC_KERNEL_SRC_FPU], [
ZFS_LINUX_TEST_SRC([kernel_fpu], [
#include <linux/types.h>
#ifdef HAVE_KERNEL_FPU_API_HEADER
#include <asm/fpu/api.h>
#ifdef HAVE_KERNEL_FPU_INTERNAL_HEADER
#include <asm/fpu/internal.h>
#endif
#else
#include <asm/i387.h>
#endif
], [
kernel_fpu_begin();
kernel_fpu_end();
], [], [ZFS_META_LICENSE])
ZFS_LINUX_TEST_SRC([__kernel_fpu], [
#include <linux/types.h>
#ifdef HAVE_KERNEL_FPU_API_HEADER
#include <asm/fpu/api.h>
#ifdef HAVE_KERNEL_FPU_INTERNAL_HEADER
#include <asm/fpu/internal.h>
#endif
#else
#include <asm/i387.h>
#endif
], [
__kernel_fpu_begin();
__kernel_fpu_end();
], [], [ZFS_META_LICENSE])
])
AC_DEFUN([ZFS_AC_KERNEL_FPU], [
dnl #
dnl # Legacy kernel
dnl #
AC_MSG_CHECKING([whether kernel fpu is available])
ZFS_LINUX_TEST_RESULT([kernel_fpu_license], [
AC_MSG_RESULT(kernel_fpu_*)
AC_DEFINE(HAVE_KERNEL_FPU, 1,
[kernel has kernel_fpu_* functions])
AC_DEFINE(KERNEL_EXPORTS_X86_FPU, 1,
[kernel exports FPU functions])
],[
dnl #
dnl # Linux 4.2 kernel
dnl #
ZFS_LINUX_TEST_RESULT_SYMBOL([__kernel_fpu_license],
[__kernel_fpu_begin],
[arch/x86/kernel/fpu/core.c arch/x86/kernel/i387.c], [
AC_MSG_RESULT(__kernel_fpu_*)
AC_DEFINE(HAVE_UNDERSCORE_KERNEL_FPU, 1,
[kernel has __kernel_fpu_* functions])
AC_DEFINE(KERNEL_EXPORTS_X86_FPU, 1,
[kernel exports FPU functions])
],[
AC_MSG_RESULT(internal)
AC_DEFINE(HAVE_KERNEL_FPU_INTERNAL, 1,
[kernel fpu internal])
])
])
])
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