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7b89149c9f
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
131 lines
3.4 KiB
Plaintext
131 lines
3.4 KiB
Plaintext
dnl #
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dnl # Handle differences in kernel FPU code.
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dnl #
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dnl # Kernel
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dnl # 5.19: The asm/fpu/internal.h header was removed, it has been
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dnl # effectively empty since the 5.16 kernel.
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dnl #
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dnl # 5.11: kernel_fpu_begin() is an inlined function now, so don't check
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dnl # for it inside the kernel symbols.
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dnl #
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dnl # 5.0: Wrappers have been introduced to save/restore the FPU state.
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dnl # This change was made to the 4.19.38 and 4.14.120 LTS kernels.
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dnl # HAVE_KERNEL_FPU_INTERNAL
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dnl #
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dnl # 4.2: Use __kernel_fpu_{begin,end}()
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dnl # HAVE_UNDERSCORE_KERNEL_FPU & KERNEL_EXPORTS_X86_FPU
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dnl #
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dnl # Pre-4.2: Use kernel_fpu_{begin,end}()
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dnl # HAVE_KERNEL_FPU & KERNEL_EXPORTS_X86_FPU
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dnl #
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dnl # N.B. The header check is performed before all other checks since it
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dnl # depends on HAVE_KERNEL_FPU_API_HEADER being set in confdefs.h.
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_FPU_HEADER], [
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AC_MSG_CHECKING([whether fpu headers are available])
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/module.h>
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#include <asm/fpu/api.h>
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],[
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],[
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AC_DEFINE(HAVE_KERNEL_FPU_API_HEADER, 1,
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[kernel has asm/fpu/api.h])
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/module.h>
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#include <asm/fpu/internal.h>
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],[
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],[
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AC_DEFINE(HAVE_KERNEL_FPU_INTERNAL_HEADER, 1,
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[kernel has asm/fpu/internal.h])
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AC_MSG_RESULT([asm/fpu/api.h asm/fpu/internal.h])
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],[
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AC_MSG_RESULT([asm/fpu/api.h])
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])
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],[
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AC_MSG_RESULT([i387.h])
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])
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])
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AC_DEFUN([ZFS_AC_KERNEL_SRC_FPU], [
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ZFS_LINUX_TEST_SRC([kernel_fpu], [
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#include <linux/types.h>
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#ifdef HAVE_KERNEL_FPU_API_HEADER
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#include <asm/fpu/api.h>
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#ifdef HAVE_KERNEL_FPU_INTERNAL_HEADER
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#include <asm/fpu/internal.h>
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#endif
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#else
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#include <asm/i387.h>
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#endif
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], [
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kernel_fpu_begin();
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kernel_fpu_end();
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], [], [ZFS_META_LICENSE])
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ZFS_LINUX_TEST_SRC([__kernel_fpu], [
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#include <linux/types.h>
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#ifdef HAVE_KERNEL_FPU_API_HEADER
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#include <asm/fpu/api.h>
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#ifdef HAVE_KERNEL_FPU_INTERNAL_HEADER
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#include <asm/fpu/internal.h>
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#endif
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#else
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#include <asm/i387.h>
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#endif
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], [
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__kernel_fpu_begin();
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__kernel_fpu_end();
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], [], [ZFS_META_LICENSE])
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ZFS_LINUX_TEST_SRC([kernel_neon], [
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#include <asm/neon.h>
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], [
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kernel_neon_begin();
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kernel_neon_end();
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], [], [ZFS_META_LICENSE])
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])
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AC_DEFUN([ZFS_AC_KERNEL_FPU], [
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dnl #
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dnl # Legacy kernel
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dnl #
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AC_MSG_CHECKING([whether kernel fpu is available])
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ZFS_LINUX_TEST_RESULT([kernel_fpu_license], [
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AC_MSG_RESULT(kernel_fpu_*)
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AC_DEFINE(HAVE_KERNEL_FPU, 1,
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[kernel has kernel_fpu_* functions])
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AC_DEFINE(KERNEL_EXPORTS_X86_FPU, 1,
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[kernel exports FPU functions])
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],[
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dnl #
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dnl # Linux 4.2 kernel
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dnl #
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ZFS_LINUX_TEST_RESULT_SYMBOL([__kernel_fpu_license],
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[__kernel_fpu_begin],
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[arch/x86/kernel/fpu/core.c arch/x86/kernel/i387.c], [
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AC_MSG_RESULT(__kernel_fpu_*)
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AC_DEFINE(HAVE_UNDERSCORE_KERNEL_FPU, 1,
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[kernel has __kernel_fpu_* functions])
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AC_DEFINE(KERNEL_EXPORTS_X86_FPU, 1,
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[kernel exports FPU functions])
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],[
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dnl #
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dnl # ARM neon symbols (only on arm and arm64)
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dnl # could be GPL-only on arm64 after Linux 6.2
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dnl #
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ZFS_LINUX_TEST_RESULT([kernel_neon_license],[
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AC_MSG_RESULT(kernel_neon_*)
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AC_DEFINE(HAVE_KERNEL_NEON, 1,
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[kernel has kernel_neon_* functions])
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],[
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# catch-all
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AC_MSG_RESULT(internal)
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AC_DEFINE(HAVE_KERNEL_FPU_INTERNAL, 1,
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[kernel fpu internal])
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])
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])
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])
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])
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