cleanup the RAID6 P/Q library v2

[Ard Biesheuvel]

On Tue, 12 May 2026, at 07:20, Christoph Hellwig wrote:
> Hi all,
>
> this series cleans up the RAID6 P/Q library to match the recent updates
> to the RAID 5 XOR library and other CRC/crypto libraries.  This includes
> providing properly documented external interfaces, hiding the internals,
> using static_call instead of indirect calls and turning the user space
> test suite into an in-kernel kunit test which is also extended to
> improve coverage.
>
> Note that this changes registration so that non-priority algorithms are
> not registered, which greatly helps with the benchmark time at boot time.
> I'd like to encourage all architecture maintainers to see if they can
> further optimized this by registering as few as possible algorithms when
> there is a clear benefit in optimized or more unrolled implementations.
>
> This series sits on top of the "cleanup the RAID5 XOR library v3" series.
>
> A git tree is also available here:
>
>     git://git.infradead.org/users/hch/misc.git lib-raid6
>
> Gitweb:
>
>     
> https://git.infradead.org/?p=users/hch/misc.git;a=shortlog;h=refs/heads/lib-raid6
>
> Changes since v1:
>  - fix arm64 objdir != srcdir builds
>  - call the kunit module raid6_kunit.ko from the beginning
>  - update MAINTAINERS
>  - don't require preemptible context and apply the same restrictions as
>    the merged version of the XOR API
>  - fix the arm64 default in Kconfig
>  - pick the last registered (and presumably most optimized) algorithm when
>    benchmarking is disabled
>  - port over the randomization fixes from the XOR series
>  - misc other kunit cleanups
>  - require at least 4 devices for RAID6 to skip broken special cases
>

Tested-by: Ard Biesheuvel <ardb at kernel.org> # kunit only on arm64
Acked-by: Ard Biesheuvel <ardb at kernel.org>