Re: [PATCH] lib/crypto: arm64: Drop checks for CONFIG_KERNEL_MODE_NEON

[Christoph Hellwig]

On Tue, Mar 17, 2026 at 04:08:24PM +0100, Ard Biesheuvel wrote:
> 
> On Tue, 17 Mar 2026, at 15:45, Christoph Hellwig wrote:
> > On Tue, Mar 17, 2026 at 12:09:34PM +0100, Ard Biesheuvel wrote:
> >> Acked-by: Ard Biesheuvel <ardb@xxxxxxxxxx>
> >> 
> >> Actually, we should just get rid of CONFIG_KERNEL_MODE_NEON entirely on arm64, although there is some code shared with ARM that would still need some checks. But anything that is arm64-only should never look at this at all.
> >
> > I'll also drop it from the XOR series.
> >
> 
> Ack - mind cc'ing me on the next revision?

Sure.

> 
> > Talking about which (sorry for highjacking this thread), arm32 and arm64
> > have completely different neon XOR implementations, where arm32 uses
> > #pragma GCC optimize "tree-vectorize" or clang auto-vectorization of
> > the generic C implementation, and arm64 uses intrinsics.  Is there any
> > chance those could share a single implementation?
> 
> If we're migrating the XOR arch code to live under lib (if that is what
> you are proposing),

That's what is happening right now:

https://lore.kernel.org/linux-raid/20260311115754.ca2206d1428c49c3bd6e93cf@xxxxxxxxxxxxxxxxxxxx/T/#t