105 lines
2.9 KiB
Plaintext
105 lines
2.9 KiB
Plaintext
dnl #
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dnl # Handle differences in kernel FPU code.
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dnl #
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dnl # Kernel
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dnl # 5.2: The fpu->initialized flag was replaced by TIF_NEED_FPU_LOAD.
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dnl # HAVE_KERNEL_TIF_NEED_FPU_LOAD
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dnl #
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dnl # 5.0: As an optimization SIMD operations performed by kernel
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dnl # threads can skip saving and restoring their FPU context.
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dnl # Wrappers have been introduced to determine the running
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dnl # context and use either the SIMD or generic implementation.
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dnl # This change was made to the 4.19.38 and 4.14.120 LTS kernels.
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dnl # HAVE_KERNEL_FPU_INITIALIZED
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dnl #
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dnl # 4.2: Use __kernel_fpu_{begin,end}()
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dnl # HAVE_UNDERSCORE_KERNEL_FPU & KERNEL_EXPORTS_X86_FPU
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dnl #
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dnl # Pre-4.2: Use kernel_fpu_{begin,end}()
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dnl # HAVE_KERNEL_FPU & KERNEL_EXPORTS_X86_FPU
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_FPU], [
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AC_MSG_CHECKING([which kernel_fpu header to use])
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/module.h>
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#include <asm/fpu/api.h>
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],[
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],[
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AC_DEFINE(HAVE_KERNEL_FPU_API_HEADER, 1,
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[kernel has asm/fpu/api.h])
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AC_MSG_RESULT(asm/fpu/api.h)
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],[
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AC_MSG_RESULT(i387.h & xcr.h)
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])
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AC_MSG_CHECKING([which kernel_fpu function to use])
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ZFS_LINUX_TRY_COMPILE_SYMBOL([
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#include <linux/module.h>
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#ifdef HAVE_KERNEL_FPU_API_HEADER
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#include <asm/fpu/api.h>
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#else
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#include <asm/i387.h>
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#include <asm/xcr.h>
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#endif
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MODULE_LICENSE("$ZFS_META_LICENSE");
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],[
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kernel_fpu_begin();
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kernel_fpu_end();
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], [kernel_fpu_begin], [arch/x86/kernel/fpu/core.c], [
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AC_MSG_RESULT(kernel_fpu_*)
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AC_DEFINE(HAVE_KERNEL_FPU, 1,
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[kernel has kernel_fpu_* functions])
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AC_DEFINE(KERNEL_EXPORTS_X86_FPU, 1,
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[kernel exports FPU functions])
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],[
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ZFS_LINUX_TRY_COMPILE_SYMBOL([
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#include <linux/module.h>
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#ifdef HAVE_KERNEL_FPU_API_HEADER
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#include <asm/fpu/api.h>
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#else
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#include <asm/i387.h>
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#include <asm/xcr.h>
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#endif
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MODULE_LICENSE("$ZFS_META_LICENSE");
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],[
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__kernel_fpu_begin();
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__kernel_fpu_end();
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], [__kernel_fpu_begin], [arch/x86/kernel/fpu/core.c arch/x86/kernel/i387.c], [
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AC_MSG_RESULT(__kernel_fpu_*)
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AC_DEFINE(HAVE_UNDERSCORE_KERNEL_FPU, 1,
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[kernel has __kernel_fpu_* functions])
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AC_DEFINE(KERNEL_EXPORTS_X86_FPU, 1,
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[kernel exports FPU functions])
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],[
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/module.h>
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#include <linux/sched.h>
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],[
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struct fpu *fpu = ¤t->thread.fpu;
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if (fpu->initialized) { return (0); };
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],[
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AC_MSG_RESULT(fpu.initialized)
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AC_DEFINE(HAVE_KERNEL_FPU_INITIALIZED, 1,
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[kernel fpu.initialized exists])
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],[
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/module.h>
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#include <asm/thread_info.h>
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#if !defined(TIF_NEED_FPU_LOAD)
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#error "TIF_NEED_FPU_LOAD undefined"
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#endif
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],[
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],[
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AC_MSG_RESULT(TIF_NEED_FPU_LOAD)
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AC_DEFINE(
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HAVE_KERNEL_TIF_NEED_FPU_LOAD, 1,
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[kernel TIF_NEED_FPU_LOAD exists])
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],[
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AC_MSG_RESULT(unavailable)
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])
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])
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])
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])
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])
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