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Linux 5.16 compat: asm/fpu/xcr.h is new location for xgetbv/xsetbv 

Linux 5.16 moved these functions into this new header in commit
1b4fb8545f2b00f2844c4b7619d64d98440a477c. This change adds code to look
for the presence of this header, and include it so that the code using
xgetbv & xsetbv will compile again.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Coleman Kane <ckane@colemankane.org>
Closes #12800
This commit is contained in:
Coleman Kane 2021-11-15 23:23:30 -05:00 committed by Brian Behlendorf
parent c0fb44c506
commit 75b309a938
2 changed files with 18 additions and 0 deletions
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15
config/kernel-fpu.m4
View File

@ -2,6 +2,9 @@ dnl #
dnl # Handle differences in kernel FPU code.
dnl #
dnl # Kernel
dnl # 5.16: XCR code put into asm/fpu/xcr.h
dnl # HAVE_KERNEL_FPU_XCR_HEADER
dnl #
dnl # 5.0: Wrappers have been introduced to save/restore the FPU state.
dnl # This change was made to the 4.19.38 and 4.14.120 LTS kernels.
dnl # HAVE_KERNEL_FPU_INTERNAL
@ -25,6 +28,18 @@ AC_DEFUN([ZFS_AC_KERNEL_FPU_HEADER], [
AC_DEFINE(HAVE_KERNEL_FPU_API_HEADER, 1,
[kernel has asm/fpu/api.h])
AC_MSG_RESULT(asm/fpu/api.h)
AC_MSG_CHECKING([whether fpu/xcr header is available])
ZFS_LINUX_TRY_COMPILE([
#include <linux/module.h>
#include <asm/fpu/xcr.h>
],[
],[
AC_DEFINE(HAVE_KERNEL_FPU_XCR_HEADER, 1,
[kernel has asm/fpu/xcr.h])
AC_MSG_RESULT(asm/fpu/xcr.h)
],[
AC_MSG_RESULT(no asm/fpu/xcr.h)
])
],[
AC_MSG_RESULT(i387.h & xcr.h)
])

3
include/os/linux/kernel/linux/simd_x86.h
View File

@ -88,6 +88,9 @@
#if defined(HAVE_KERNEL_FPU_API_HEADER)
#include <asm/fpu/api.h>
#include <asm/fpu/internal.h>
#if defined(HAVE_KERNEL_FPU_XCR_HEADER)
#include <asm/fpu/xcr.h>
#endif
#else
#include <asm/i387.h>
#include <asm/xcr.h>