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2.2 fails to build kernel modules on aarch64 #15401

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q66 opened this issue Oct 13, 2023 · 6 comments
Closed

2.2 fails to build kernel modules on aarch64 #15401

q66 opened this issue Oct 13, 2023 · 6 comments
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Type: Architecture Indicates an issue is specific to a single processor architecture Type: Building Indicates an issue related to building binaries Type: Defect Incorrect behavior (e.g. crash, hang)

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@q66
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q66 commented Oct 13, 2023

System information

Type Version/Name
Distribution Name Chimera Linux
Distribution Version rolling
Kernel Version 6.5.x
Architecture aarch64
OpenZFS Version 2:2

Describe the problem you're observing

Does not build on aarch64:

ERROR: modpost: GPL-incompatible module zfs.ko uses GPL-only symbol 'kernel_neon_begin'
ERROR: modpost: GPL-incompatible module zfs.ko uses GPL-only symbol 'kernel_neon_end'

Describe how to reproduce the problem

Build the kernel modules on aarch64.

Include any warning/errors/backtraces from the system logs

Clang 16 compiler, but should not be relevant.
@q66 q66 added the Type: Defect Incorrect behavior (e.g. crash, hang) label Oct 13, 2023
@q66
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q66 commented Oct 13, 2023

Hm, I guess this is actually a dupe of #14555. 2.1.x builds for me because I was patching out the neon paths for raidz/fletcher, but it seems 2.2 brought changes that expand the usage of kernel NEON further, which resulted in that no longer being sufficient.

@luckylinux
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luckylinux commented Nov 26, 2023 •
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I'm facing the same issue. Kernel 6.6.1 arm64 with ZFS 2.2.1 (since OpenZFS 2.2.1 Linux Kernel 6.6 series is supported).

 make -s -j$(nproc)

  GEN      gitrev
Making all in include
Making all in tests/zfs-tests/tests
  GEN      functional/pyzfs/pyzfs_unittest.ksh
  GEN      functional/pam/utilities.kshlib
Making all in module
warning: the compiler differs from the one used to build the kernel
  The kernel was built by: gcc-13 (Debian 13.2.0-5) 13.2.0
  You are using:           gcc (Debian 12.2.0-14) 12.2.0
ERROR: modpost: GPL-incompatible module zfs.ko uses GPL-only symbol 'kernel_neon_end'
ERROR: modpost: GPL-incompatible module zfs.ko uses GPL-only symbol 'kernel_neon_begin'
make[5]: *** [scripts/Makefile.modpost:145: /usr/src/zfs/zfs-zfs-2.2.1/module/Module.symvers] Error 1
make[4]: *** [/usr/src/linux-headers-6.6.1-1-arm64/Makefile:1865: modpost] Error 2
make[3]: *** [Makefile:234: __sub-make] Error 2
make[2]: *** [Makefile:56: modules-Linux] Error 2
make[1]: *** [Makefile:12116: all-recursive] Error 1
make: *** [Makefile:4600: all] Error 2

The warning is due to using a binary Kernel built from another developer for Rock Pi 5B (on Debian Testing / GCC 13), while I'm on Debian Bookworm / GCC 12.

Any solution for this ?

@q66
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q66 commented Nov 26, 2023

a workaround is https://github.com/chimera-linux/cports/blob/master/main/zfs/patches/aarch64-disable-neon.patch - but that will of course disable all the aarch64 simd

@luckylinux
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Do you mean SIMD as an ARM64 Instruction Set ? What consequences would that have ? Would ZFS work correctly in the end for e.g. a simple Disk / mirror VDEV ?

@q66
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q66 commented Nov 26, 2023

everything will work, some things will miss acceleration

@luckylinux
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Alright, at least it built now. I'll try to see if I can generate the required DEB files and see how it works. Thanks :)

@luckylinux luckylinux mentioned this issue Nov 27, 2023
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@behlendorf behlendorf added Type: Architecture Indicates an issue is specific to a single processor architecture Type: Building Indicates an issue related to building binaries labels Nov 29, 2023
@Harry-Chen Harry-Chen mentioned this issue Dec 26, 2023
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behlendorf pushed a commit to behlendorf/zfs that referenced this issue Jan 9, 2024
@Harry-Chen @behlendorf
Linux 6.2 compat: add check for kernel_neon_* availability
41ba00c 
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 <[email protected]>
Signed-off-by: Shengqi Chen <[email protected]>
Closes openzfs#15711 
Closes openzfs#14555 
Closes: openzfs#15401
behlendorf pushed a commit that referenced this issue Jan 12, 2024
@Harry-Chen @behlendorf
Linux 6.2 compat: add check for kernel_neon_* availability
976bf9b 
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 <[email protected]>
Signed-off-by: Shengqi Chen <[email protected]>
Closes #15711 
Closes #14555 
Closes: #15401
lundman pushed a commit to openzfsonwindows/openzfs that referenced this issue Mar 13, 2024
@Harry-Chen @lundman
Linux 6.2 compat: add check for kernel_neon_* availability
4454482 
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 <[email protected]>
Signed-off-by: Shengqi Chen <[email protected]>
Closes openzfs#15711 
Closes openzfs#14555 
Closes: openzfs#15401
lundman pushed a commit to openzfsonwindows/openzfs that referenced this issue Mar 13, 2024
@Harry-Chen @lundman
Linux 6.2 compat: add check for kernel_neon_* availability
cf37370 
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 <[email protected]>
Signed-off-by: Shengqi Chen <[email protected]>
Closes openzfs#15711 
Closes openzfs#14555 
Closes: openzfs#15401
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Type: Architecture Indicates an issue is specific to a single processor architecture Type: Building Indicates an issue related to building binaries Type: Defect Incorrect behavior (e.g. crash, hang)
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