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Linux 6.2 compat: add check for kernel_neon_* availability 

This patch adds check for `kernel_neon_*` symbols on arm and arm64
platforms to address the following 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).

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Shengqi Chen <harry-chen@outlook.com>
Closes #15711 
Closes #14555 
Closes: #15401
This commit is contained in:
Shengqi Chen 2024-01-09 08:05:24 +08:00 committed by Brian Behlendorf
parent f71c16a661
commit 976bf9b6a6
3 changed files with 32 additions and 3 deletions
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23
config/kernel-fpu.m4
View File

@ -79,6 +79,12 @@ 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])
])
AC_DEFUN([ZFS_AC_KERNEL_FPU], [
@ -105,9 +111,20 @@ AC_DEFUN([ZFS_AC_KERNEL_FPU], [
AC_DEFINE(KERNEL_EXPORTS_X86_FPU, 1,
[kernel exports FPU functions])
],[
AC_MSG_RESULT(internal)
AC_DEFINE(HAVE_KERNEL_FPU_INTERNAL, 1,
[kernel fpu internal])
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])
],[
# catch-all
AC_MSG_RESULT(internal)
AC_DEFINE(HAVE_KERNEL_FPU_INTERNAL, 1,
[kernel fpu internal])
])
])
])
])

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

@ -71,9 +71,15 @@
#define ID_AA64PFR0_EL1 sys_reg(3, 0, 0, 1, 0)
#define ID_AA64ISAR0_EL1 sys_reg(3, 0, 0, 6, 0)
#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() do {} while (0)

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

@ -53,9 +53,15 @@
#include <asm/elf.h>
#include <asm/hwcap.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() do {} while (0)