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Linux 5.11 compat: x86 SIMD: fix kernel_fpu_{begin,end}() detection 

Linux 5.11 changed kernel_fpu_begin() to an inlined function and
moved the functionality to kernel_fpu_begin_mask(). This breaks the
existing detection mechanism since it checks if kernel_fpu_begin is
an exported kernel symbol, which isn't the case for an inlined
function.

To avoid assumptions about internal implementation, replace
ZFS_LINUX_TEST_RESULT_SYMBOL in favor of  ZFS_LINUX_TEST_RESULT
which already makes sure kernel_fpu_{begin,end}() is usable by us.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Attila Fülöp <attila@fueloep.org>
Closes #13147
This commit is contained in:
Attila Fülöp 2022-02-24 18:23:41 +01:00 committed by Tony Hutter
parent b55ed8df92
commit 1d70698174
1 changed files with 4 additions and 2 deletions
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6
config/kernel-fpu.m4
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@ -8,6 +8,9 @@ dnl #
dnl # XSTATE_XSAVE and XSTATE_XRESTORE aren't accessible any more
dnl # HAVE_KERNEL_FPU_XSAVE_INTERNAL
dnl #
dnl # 5.11: kernel_fpu_begin() is an inlined function now, so don't check
dnl # for it inside the kernel symbols.
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
@ -147,8 +150,7 @@ AC_DEFUN([ZFS_AC_KERNEL_FPU], [
dnl # Legacy kernel
dnl #
AC_MSG_CHECKING([whether kernel fpu is available])
ZFS_LINUX_TEST_RESULT_SYMBOL([kernel_fpu_license],
[kernel_fpu_begin], [arch/x86/kernel/fpu/core.c], [
ZFS_LINUX_TEST_RESULT([kernel_fpu_license], [
AC_MSG_RESULT(kernel_fpu_*)
AC_DEFINE(HAVE_KERNEL_FPU, 1,
[kernel has kernel_fpu_* functions])