]> git.hungrycats.org Git - linux/commitdiff
arm64: Kconfig: Make SME depend on BROKEN for now
authorMark Rutland <mark.rutland@arm.com>
Wed, 6 Nov 2024 16:42:20 +0000 (16:42 +0000)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 14 Nov 2024 12:15:17 +0000 (13:15 +0100)
commit 81235ae0c846e1fb46a2c6fe9283fe2b2b24f7dc upstream.

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@arm.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Mark Brown <broonie@kernel.org>
Cc: Will Deacon <will@kernel.org>
Cc: stable@vger.kernel.org # 5.19
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20241106164220.2789279-1-mark.rutland@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
arch/arm64/Kconfig

index 1a62ef142a98887c420785c25be32eef49d07424..57b437ed0974795597a297d5b7c6af3011d9d479 100644 (file)
@@ -2113,6 +2113,7 @@ config ARM64_SME
        bool "ARM Scalable Matrix Extension support"
        default y
        depends on ARM64_SVE
+       depends on BROKEN
        help
          The Scalable Matrix Extension (SME) is an extension to the AArch64
          execution state which utilises a substantial subset of the SVE