Just like symbol 'mmu_feature_keys'[1], 'cpu_feature_keys' was referenced indirectly by many inline functions; any GPL-incompatible modules using such a function will be potentially broken due to 'cpu_feature_keys' being exported as GPL-only.
For example it still breaks ZFS, see https://github.com/openzfs/zfs/issues/14545
[1]: https://patchwork.ozlabs.org/project/linuxppc-dev/patch/20220329085709.41327...
On Tue, Feb 28, 2023 at 04:18:12PM +0800, 王昊然 wrote:
Just like symbol 'mmu_feature_keys'[1], 'cpu_feature_keys' was referenced indirectly by many inline functions; any GPL-incompatible modules using such a function will be potentially broken due to 'cpu_feature_keys' being exported as GPL-only.
For example it still breaks ZFS, see https://github.com/openzfs/zfs/issues/14545
External modules are always on their own, sorry. Especially ones that are not released under the GPL.
good luck!
greg k-h
2023-02-28 16:28 GMT+08:00, Greg KH gregkh@linuxfoundation.org:
On Tue, Feb 28, 2023 at 04:18:12PM +0800, 王昊然 wrote:
Just like symbol 'mmu_feature_keys'[1], 'cpu_feature_keys' was referenced indirectly by many inline functions; any GPL-incompatible modules using such a function will be potentially broken due to 'cpu_feature_keys' being exported as GPL-only.
For example it still breaks ZFS, see https://github.com/openzfs/zfs/issues/14545
External modules are always on their own, sorry. Especially ones that are not released under the GPL.
good luck!
greg k-h
Some inline functions are just powerpc implementation of some generic KPIs, such as flush_dcache_page, which indirectly references 'cpu_feature_keys' in powerpc-specific code; this essentially makes 'flush_dcache_page' GPL-only in Linux powerpc. Some inline functions are just powerpc implementati
2023-02-28 16:28 GMT+08:00, Greg KH gregkh@linuxfoundation.org:
On Tue, Feb 28, 2023 at 04:18:12PM +0800, 王昊然 wrote:
Just like symbol 'mmu_feature_keys'[1], 'cpu_feature_keys' was referenced indirectly by many inline functions; any GPL-incompatible modules using such a function will be potentially broken due to 'cpu_feature_keys' being exported as GPL-only.
For example it still breaks ZFS, see https://github.com/openzfs/zfs/issues/14545
External modules are always on their own, sorry. Especially ones that are not released under the GPL.
good luck!
greg k-h
Some inline functions are just powerpc implementation of some generic KPIs, such as flush_dcache_page, which indirectly references 'cpu_feature_keys' in powerpc-specific code; this essentially makes 'flush_dcache_page' GPL-only in Linux powerpc, but not in other architectures.
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Greg KH -
王昊然