diff options
| author | Attila Fülöp <attila@fueloep.org> | 2022-02-24 18:23:41 +0100 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2022-02-24 09:23:41 -0800 |
| commit | 4d14a285b341b7031c0d23b7dd6b5ad63de8f0d4 (patch) | |
| tree | 4d91983c265c6957c0c8b7f89447f928e8d23f18 | |
| parent | 361a7e821178e105c8e1206ead4479de83c2a617 (diff) | |
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
| -rw-r--r-- | config/kernel-fpu.m4 | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/config/kernel-fpu.m4 b/config/kernel-fpu.m4 index 06280239d..7f8b028d0 100644 --- a/config/kernel-fpu.m4 +++ b/config/kernel-fpu.m4 @@ -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]) |