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kernel_fpu fixes

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This patch fixes a few issues when detecting which kernel_fpu functions
are available.

- Use kernel_fpu_begin() if it's exported on newer kernels.

- Use ZFS_LINUX_TRY_COMPILE_SYMBOL() to choose the right kernel_fpu
  function when using --enable-linux-builtin.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tony Hutter <hutter2@llnl.gov>
Closes #8259
Closes #8363
This commit is contained in:
Tony Hutter 2019-03-06 16:03:03 -08:00 committed by Brian Behlendorf
parent a73e8fdb93
commit becdcec7b9
2 changed files with 37 additions and 8 deletions
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34
config/kernel-fpu.m4
View File

@ -12,25 +12,49 @@ 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 function to use])
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("$ZFS_META_LICENSE");
],[
kernel_fpu_begin();
kernel_fpu_end();
],[
], [kernel_fpu_begin], [arch/x86/kernel/fpu/core.c], [
AC_MSG_RESULT(kernel_fpu_*)
AC_DEFINE(HAVE_KERNEL_FPU, 1, [kernel has kernel_fpu_* functions])
AC_DEFINE(KERNEL_EXPORTS_X86_FPU, 1, [kernel exports FPU functions])
],[
ZFS_LINUX_TRY_COMPILE([
#include <linux/kernel.h>
ZFS_LINUX_TRY_COMPILE_SYMBOL([
#include <linux/module.h>
#ifdef HAVE_KERNEL_FPU_API_HEADER
#include <asm/fpu/api.h>
#else
#include <asm/i387.h>
#include <asm/xcr.h>
#endif
MODULE_LICENSE("$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])

11
include/linux/simd_x86.h
View File

@ -81,9 +81,16 @@
#endif
#if defined(_KERNEL)
#if defined(HAVE_UNDERSCORE_KERNEL_FPU)
#if defined(HAVE_KERNEL_FPU_API_HEADER)
#include <asm/fpu/api.h>
#include <asm/fpu/internal.h>
#else
#include <asm/i387.h>
#include <asm/xcr.h>
#endif
#if defined(HAVE_UNDERSCORE_KERNEL_FPU)
#define kfpu_begin() \
{ \
preempt_disable(); \
@ -95,8 +102,6 @@
preempt_enable(); \
}
#elif defined(HAVE_KERNEL_FPU)
#include <asm/i387.h>
#include <asm/xcr.h>
#define kfpu_begin() kernel_fpu_begin()
#define kfpu_end() kernel_fpu_end()
#else