From: Catalin Marinas <catalin.marinas@arm.com>
To: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, will@kernel.org, maz@kernel.org,
mark.rutland@arm.com, dave.martin@arm.com,
ard.biesheuvel@linaro.org, christoffer.dall@arm.com
Subject: Re: [PATCH v2 3/7] arm64: cpufeature: Fix the type of no FP/SIMD capability
Date: Fri, 10 Jan 2020 14:50:56 +0000 [thread overview]
Message-ID: <20200110145055.GE8786@arrakis.emea.arm.com> (raw)
In-Reply-To: <20191217183402.2259904-4-suzuki.poulose@arm.com>
On Tue, Dec 17, 2019 at 06:33:58PM +0000, Suzuki K Poulose wrote:
> The NO_FPSIMD capability is defined with scope SYSTEM, which implies
> that the "absence" of FP/SIMD on at least one CPU is detected only
> after all the SMP CPUs are brought up. However, we use the status
> of this capability for every context switch. So, let us change
> the scope to LOCAL_CPU to allow the detection of this capability
> as and when the first CPU without FP is brought up.
>
> Also, the current type allows hotplugged CPU to be brought up without
> FP/SIMD when all the current CPUs have FP/SIMD and we have the userspace
> up. Fix both of these issues by changing the capability to
> BOOT_RESTRICTED_LOCAL_CPU_FEATURE.
>
> Fixes: 82e0191a1aa11abf ("arm64: Support systems without FP/ASIMD")
> Cc: Will Deacon <will@kernel.org>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
next prev parent reply other threads:[~2020-01-10 14:51 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-17 18:33 [PATCH v2 0/7] arm64: Fix support for no FP/SIMD Suzuki K Poulose
2019-12-17 18:33 ` [PATCH v2 1/7] arm64: Introduce system_capabilities_finalized() marker Suzuki K Poulose
2020-01-10 14:50 ` Catalin Marinas
2019-12-17 18:33 ` [PATCH v2 2/7] arm64: fpsimd: Make sure SVE setup is complete before SIMD is used Suzuki K Poulose
2020-01-10 11:51 ` Catalin Marinas
2020-01-10 18:41 ` Suzuki Kuruppassery Poulose
2019-12-17 18:33 ` [PATCH v2 3/7] arm64: cpufeature: Fix the type of no FP/SIMD capability Suzuki K Poulose
2020-01-10 14:50 ` Catalin Marinas [this message]
2019-12-17 18:33 ` [PATCH v2 4/7] arm64: cpufeature: Set the FP/SIMD compat HWCAP bits properly Suzuki K Poulose
2020-01-10 14:51 ` Catalin Marinas
2019-12-17 18:34 ` [PATCH v2 5/7] arm64: ptrace: nofpsimd: Fail FP/SIMD regset operations Suzuki K Poulose
2020-01-10 15:12 ` Catalin Marinas
2020-01-10 18:42 ` Suzuki Kuruppassery Poulose
2019-12-17 18:34 ` [PATCH v2 6/7] arm64: signal: nofpsimd: Handle fp/simd context for signal frames Suzuki K Poulose
2020-01-10 12:34 ` Catalin Marinas
2019-12-17 18:34 ` [PATCH v2 7/7] arm64: nofpsmid: Handle TIF_FOREIGN_FPSTATE flag cleanly Suzuki K Poulose
2019-12-17 19:05 ` Marc Zyngier
2019-12-18 11:42 ` Suzuki Kuruppassery Poulose
2019-12-18 11:56 ` Marc Zyngier
2019-12-18 12:00 ` Suzuki Kuruppassery Poulose
2020-01-10 15:21 ` Marc Zyngier
2020-01-13 10:28 ` Suzuki Kuruppassery Poulose
2020-01-10 14:49 ` Catalin Marinas
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