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[2.1] compat: add check for kernel_neon_* availability 

This patch backports the change from #15711 (to ZFS 2.2.x) because
some OS vendors have back-ported this change from Linux 6.2+ to their
older kernels.

The original patch addressed these issues:

1. Linux 6.2+ on arm64 has exported them with `EXPORT_SYMBOL_GPL`, so
   license compatibility must be checked before use.
2. On both arm and arm64, the definitions of these symbols are guarded
   by `CONFIG_KERNEL_MODE_NEON`, but their declarations are still
   present. Checking in configuration phase only leads to MODPOST
   errors (undefined references).

Signed-off-by: Keith Gable <keith@ziggythehamster.sh>
Co-authored-by: Shengqi Chen <harry-chen@outlook.com>
This commit is contained in:
Keith Gable 2024-01-11 15:48:00 -08:00 committed by Brian Behlendorf
parent 12a031a3f5
commit f8f3cac084
2 changed files with 34 additions and 11 deletions
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17
config/kernel-fpu.m4
View File

@ -91,6 +91,13 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_FPU], [
__kernel_fpu_end();
], [], [ZFS_META_LICENSE])
ZFS_LINUX_TEST_SRC([kernel_neon], [
#include <asm/neon.h>
], [
kernel_neon_begin();
kernel_neon_end();
], [], [ZFS_META_LICENSE])
ZFS_LINUX_TEST_SRC([fpu_internal], [
#if defined(__x86_64) || defined(__x86_64__) || \
defined(__i386) || defined(__i386__)
@ -185,6 +192,15 @@ AC_DEFUN([ZFS_AC_KERNEL_FPU], [
[kernel has __kernel_fpu_* functions])
AC_DEFINE(KERNEL_EXPORTS_X86_FPU, 1,
[kernel exports FPU functions])
],[
dnl #
dnl # ARM neon symbols (only on arm and arm64)
dnl # could be GPL-only on arm64 after Linux 6.2
dnl #
ZFS_LINUX_TEST_RESULT([kernel_neon_license],[
AC_MSG_RESULT(kernel_neon_*)
AC_DEFINE(HAVE_KERNEL_NEON, 1,
[kernel has kernel_neon_* functions])
],[
ZFS_LINUX_TEST_RESULT([fpu_internal], [
AC_MSG_RESULT(internal)
@ -202,3 +218,4 @@ AC_DEFUN([ZFS_AC_KERNEL_FPU], [
])
])
])
])

6
include/os/linux/kernel/linux/simd_aarch64.h
View File

@ -43,9 +43,15 @@
#include <sys/types.h>
#include <asm/neon.h>
#if (defined(HAVE_KERNEL_NEON) && defined(CONFIG_KERNEL_MODE_NEON))
#define kfpu_allowed() 1
#define kfpu_begin() kernel_neon_begin()
#define kfpu_end() kernel_neon_end()
#else
#define kfpu_allowed() 0
#define kfpu_begin() do {} while (0)
#define kfpu_end() do {} while (0)
#endif
#define kfpu_init() 0
#define kfpu_fini() ((void) 0)