config/kernel-fpu.m4

   1 dnl #
   2 dnl # Handle differences in kernel FPU code.
   3 dnl #
   4 dnl # Kernel
   5 dnl # 5.19:     The asm/fpu/internal.h header was removed, it has been
   6 dnl #           effectively empty since the 5.16 kernel.
   7 dnl #
   8 dnl # 5.11:     kernel_fpu_begin() is an inlined function now, so don't check
   9 dnl #           for it inside the kernel symbols.
  10 dnl #
  11 dnl # 5.0:      Wrappers have been introduced to save/restore the FPU state.
  12 dnl #           This change was made to the 4.19.38 and 4.14.120 LTS kernels.
  13 dnl #           HAVE_KERNEL_FPU_INTERNAL
  14 dnl #
  15 dnl # 4.2:      Use __kernel_fpu_{begin,end}()
  16 dnl #           HAVE_UNDERSCORE_KERNEL_FPU & KERNEL_EXPORTS_X86_FPU
  17 dnl #
  18 dnl # Pre-4.2:  Use kernel_fpu_{begin,end}()
  19 dnl #           HAVE_KERNEL_FPU & KERNEL_EXPORTS_X86_FPU
  20 dnl #
  21 dnl # N.B. The header check is performed before all other checks since it
  22 dnl # depends on HAVE_KERNEL_FPU_API_HEADER being set in confdefs.h.
  23 dnl #
  24 AC_DEFUN([ZFS_AC_KERNEL_FPU_HEADER], [
  25         AC_MSG_CHECKING([whether fpu headers are available])
  26         ZFS_LINUX_TRY_COMPILE([
  27                 #include <linux/module.h>
  28                 #include <asm/fpu/api.h>
  29         ],[
  30         ],[
  31                 AC_DEFINE(HAVE_KERNEL_FPU_API_HEADER, 1,
  32                     [kernel has asm/fpu/api.h])
  33
  34                 ZFS_LINUX_TRY_COMPILE([
  35                         #include <linux/module.h>
  36                         #include <asm/fpu/internal.h>
  37                 ],[
  38                 ],[
  39                         AC_DEFINE(HAVE_KERNEL_FPU_INTERNAL_HEADER, 1,
  40                             [kernel has asm/fpu/internal.h])
  41                         AC_MSG_RESULT([asm/fpu/api.h asm/fpu/internal.h])
  42                 ],[
  43                         AC_MSG_RESULT([asm/fpu/api.h])
  44                 ])
  45         ],[
  46                 AC_MSG_RESULT([i387.h])
  47         ])
  48
  49 ])
  50
  51 AC_DEFUN([ZFS_AC_KERNEL_SRC_FPU], [
  52         ZFS_LINUX_TEST_SRC([kernel_fpu], [
  53                 #include <linux/types.h>
  54                 #ifdef HAVE_KERNEL_FPU_API_HEADER
  55                 #include <asm/fpu/api.h>
  56                 #ifdef HAVE_KERNEL_FPU_INTERNAL_HEADER
  57                 #include <asm/fpu/internal.h>
  58                 #endif
  59                 #else
  60                 #include <asm/i387.h>
  61                 #endif
  62         ], [
  63                 kernel_fpu_begin();
  64                 kernel_fpu_end();
  65         ], [], [ZFS_META_LICENSE])
  66
  67         ZFS_LINUX_TEST_SRC([__kernel_fpu], [
  68                 #include <linux/types.h>
  69                 #ifdef HAVE_KERNEL_FPU_API_HEADER
  70                 #include <asm/fpu/api.h>
  71                 #ifdef HAVE_KERNEL_FPU_INTERNAL_HEADER
  72                 #include <asm/fpu/internal.h>
  73                 #endif
  74                 #else
  75                 #include <asm/i387.h>
  76                 #endif
  77         ], [
  78                 __kernel_fpu_begin();
  79                 __kernel_fpu_end();
  80         ], [], [ZFS_META_LICENSE])
  81
  82         ZFS_LINUX_TEST_SRC([kernel_neon], [
  83                 #include <asm/neon.h>
  84         ], [
  85                 kernel_neon_begin();
  86                 kernel_neon_end();
  87         ], [], [ZFS_META_LICENSE])
  88 ])
  89
  90 AC_DEFUN([ZFS_AC_KERNEL_FPU], [
  91         dnl #
  92         dnl # Legacy kernel
  93         dnl #
  94         AC_MSG_CHECKING([whether kernel fpu is available])
  95         ZFS_LINUX_TEST_RESULT([kernel_fpu_license], [
  96                 AC_MSG_RESULT(kernel_fpu_*)
  97                 AC_DEFINE(HAVE_KERNEL_FPU, 1,
  98                     [kernel has kernel_fpu_* functions])
  99                 AC_DEFINE(KERNEL_EXPORTS_X86_FPU, 1,
 100                     [kernel exports FPU functions])
 101         ],[
 102                 dnl #
 103                 dnl # Linux 4.2 kernel
 104                 dnl #
 105                 ZFS_LINUX_TEST_RESULT_SYMBOL([__kernel_fpu_license],
 106                     [__kernel_fpu_begin],
 107                     [arch/x86/kernel/fpu/core.c arch/x86/kernel/i387.c], [
 108                         AC_MSG_RESULT(__kernel_fpu_*)
 109                         AC_DEFINE(HAVE_UNDERSCORE_KERNEL_FPU, 1,
 110                             [kernel has __kernel_fpu_* functions])
 111                         AC_DEFINE(KERNEL_EXPORTS_X86_FPU, 1,
 112                             [kernel exports FPU functions])
 113                 ],[
 114                         dnl #
 115                         dnl # ARM neon symbols (only on arm and arm64)
 116                         dnl # could be GPL-only on arm64 after Linux 6.2
 117                         dnl #
 118                         ZFS_LINUX_TEST_RESULT([kernel_neon_license],[
 119                                 AC_MSG_RESULT(kernel_neon_*)
 120                                 AC_DEFINE(HAVE_KERNEL_NEON, 1,
 121                                     [kernel has kernel_neon_* functions])
 122                         ],[
 123                                 # catch-all
 124                                 AC_MSG_RESULT(internal)
 125                                 AC_DEFINE(HAVE_KERNEL_FPU_INTERNAL, 1,
 126                                     [kernel fpu internal])
 127                         ])
 128                 ])
 129         ])
 130 ])