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dnl #
dnl # Handle differences in kernel FPU code.
dnl #
dnl # Kernel
dnl # 5.2: The fpu->initialized flag was replaced by TIF_NEED_FPU_LOAD.
dnl # HAVE_KERNEL_TIF_NEED_FPU_LOAD
dnl #
dnl # 5.0: As an optimization SIMD operations performed by kernel
dnl # threads can skip saving and restoring their FPU context.
dnl # Wrappers have been introduced to determine the running
dnl # context and use either the SIMD or generic implementation.
dnl # This change was made to the 4.19.38 and 4.14.120 LTS kernels.
dnl # HAVE_KERNEL_FPU_INITIALIZED
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 #
AC_DEFUN([ZFS_AC_KERNEL_FPU], [
AC_MSG_CHECKING([which kernel_fpu header to use])
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])
AC_MSG_RESULT(asm/fpu/api.h)
],[
AC_MSG_RESULT(i387.h & xcr.h)
])
AC_MSG_CHECKING([which kernel_fpu function to use])
ZFS_LINUX_TRY_COMPILE_SYMBOL([
#include <linux/module.h>
#ifdef HAVE_KERNEL_FPU_API_HEADER
#include <asm/fpu/api.h>
#else
#include <asm/i387.h>
#include <asm/xcr.h>
#endif
MODULE_LICENSE("$ZFS_META_LICENSE");
],[
kernel_fpu_begin();
kernel_fpu_end();
], [kernel_fpu_begin], [arch/x86/kernel/fpu/core.c], [
AC_MSG_RESULT(kernel_fpu_*)
AC_DEFINE(HAVE_KERNEL_FPU, 1,
[kernel has kernel_fpu_* functions])
AC_DEFINE(KERNEL_EXPORTS_X86_FPU, 1,
[kernel exports FPU functions])
],[
ZFS_LINUX_TRY_COMPILE_SYMBOL([
#include <linux/module.h>
#ifdef HAVE_KERNEL_FPU_API_HEADER
#include <asm/fpu/api.h>
#else
#include <asm/i387.h>
#include <asm/xcr.h>
#endif
MODULE_LICENSE("$ZFS_META_LICENSE");
],[
__kernel_fpu_begin();
__kernel_fpu_end();
], [__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])
],[
ZFS_LINUX_TRY_COMPILE([
#include <linux/module.h>
#include <linux/sched.h>
],[
struct fpu *fpu = ¤t->thread.fpu;
if (fpu->initialized) { return (0); };
],[
AC_MSG_RESULT(fpu.initialized)
AC_DEFINE(HAVE_KERNEL_FPU_INITIALIZED, 1,
[kernel fpu.initialized exists])
],[
ZFS_LINUX_TRY_COMPILE([
#include <linux/module.h>
#include <asm/thread_info.h>
#if !defined(TIF_NEED_FPU_LOAD)
#error "TIF_NEED_FPU_LOAD undefined"
#endif
],[
],[
AC_MSG_RESULT(TIF_NEED_FPU_LOAD)
AC_DEFINE(
HAVE_KERNEL_TIF_NEED_FPU_LOAD, 1,
[kernel TIF_NEED_FPU_LOAD exists])
],[
AC_MSG_RESULT(unavailable)
])
])
])
])
])
|
