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authorTony Hutter <[email protected]>2019-01-11 18:01:28 -0800
committerBrian Behlendorf <[email protected]>2019-01-28 10:11:45 -0800
commit0c593296e98e3ac95f14704e4cee6cedb2134990 (patch)
tree12adc0a34c8b8e65cd1006cd30c0a51b39e30db2 /config
parented158b19b1dddf26f2bbebb4d0fd21f04fdd5d38 (diff)
Linux 5.0 compat: Disable vector instructions on 5.0+ kernels
The 5.0 kernel no longer exports the functions we need to do vector (SSE/SSE2/SSE3/AVX...) instructions. Disable vector-based checksum algorithms when building against those kernels. Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Tony Hutter <[email protected]> Closes #8259
Diffstat (limited to 'config')
-rw-r--r--config/kernel-fpu.m441
1 files changed, 32 insertions, 9 deletions
diff --git a/config/kernel-fpu.m4 b/config/kernel-fpu.m4
index 1c5690969..671fe7ea5 100644
--- a/config/kernel-fpu.m4
+++ b/config/kernel-fpu.m4
@@ -1,18 +1,41 @@
+dnl #
+dnl # Handle differences in kernel FPU code.
dnl #
-dnl # 4.2 API change
-dnl # asm/i387.h is replaced by asm/fpu/api.h
+dnl # Kernel
+dnl # 5.0: All kernel fpu functions are GPL only, so we can't use them.
+dnl # (nothing defined)
+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([whether asm/fpu/api.h exists])
+ AC_MSG_CHECKING([which kernel_fpu function to use])
ZFS_LINUX_TRY_COMPILE([
- #include <linux/kernel.h>
- #include <asm/fpu/api.h>
+ #include <asm/i387.h>
+ #include <asm/xcr.h>
],[
- __kernel_fpu_begin();
+ kernel_fpu_begin();
+ kernel_fpu_end();
],[
- AC_MSG_RESULT(yes)
- AC_DEFINE(HAVE_FPU_API_H, 1, [kernel has <asm/fpu/api.h> interface])
+ 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])
],[
- AC_MSG_RESULT(no)
+ ZFS_LINUX_TRY_COMPILE([
+ #include <linux/kernel.h>
+ #include <asm/fpu/api.h>
+ ],[
+ __kernel_fpu_begin();
+ __kernel_fpu_end();
+ ],[
+ 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(not exported)
+ ])
])
])