[PATCH] arm64: Kconfig: Make SME depend on BROKEN for now

[Catalin Marinas]

On Wed, Nov 06, 2024 at 04:42:20PM +0000, Mark Rutland wrote:
> Although support for SME was merged in v5.19, we've since uncovered a
> number of issues with the implementation, including issues which might
> corrupt the FPSIMD/SVE/SME state of arbitrary tasks. While there are
> patches to address some of these issues, ongoing review has highlighted
> additional functional problems, and more time is necessary to analyse
> and fix these.
> 
> For now, mark SME as BROKEN in the hope that we can fix things properly
> in the near future. As SME is an OPTIONAL part of ARMv9.2+, and there is
> very little extant hardware, this should not adversely affect the vast
> majority of users.
> 
> Signed-off-by: Mark Rutland <mark.rutland at arm.com>
> Cc: Ard Biesheuvel <ardb at kernel.org>
> Cc: Catalin Marinas <catalin.marinas at arm.com>
> Cc: Marc Zyngier <maz at kernel.org>
> Cc: Mark Brown <broonie at kernel.org>
> Cc: Will Deacon <will at kernel.org>
> Cc: <stable at vger.kernel.org> # 5.19

I agree that's the best way forward given the proximity to final 6.12.
Let's hope we'll revert it shortly after. Thanks to both you and broonie
for continuing to dig into this.

Acked-by: Catalin Marinas <catalin.marinas at arm.com>