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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Mark Rutland <mark.rutland@arm.com>,
	Sasha Levin <sashal@kernel.org>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>, Ard Biesheuvel <ardb@kernel.org>,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH AUTOSEL 4.19 028/252] arm64: cpufeature: Fix the type of no FP/SIMD capability
Date: Fri, 14 Feb 2020 11:08:03 -0500
Message-ID: <20200214161147.15842-28-sashal@kernel.org> (raw)
In-Reply-To: <20200214161147.15842-1-sashal@kernel.org>

From: Suzuki K Poulose <suzuki.poulose@arm.com>

[ Upstream commit 449443c03d8cfdacf7313e17779a2594ebf87e6d ]

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>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/arm64/kernel/cpufeature.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 220ebfa0ece6e..1375307fbe4d2 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -1241,7 +1241,7 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
 	{
 		/* FP/SIMD is not implemented */
 		.capability = ARM64_HAS_NO_FPSIMD,
-		.type = ARM64_CPUCAP_SYSTEM_FEATURE,
+		.type = ARM64_CPUCAP_BOOT_RESTRICTED_CPU_LOCAL_FEATURE,
 		.min_field_value = 0,
 		.matches = has_no_fpsimd,
 	},
-- 
2.20.1


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Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200214161147.15842-1-sashal@kernel.org>
2020-02-14 16:07 ` [PATCH AUTOSEL 4.19 004/252] soc: fsl: qe: change return type of cpm_muram_alloc() to s32 Sasha Levin
2020-02-14 16:08 ` Sasha Levin [this message]
2020-02-14 16:08 ` [PATCH AUTOSEL 4.19 032/252] clocksource/drivers/bcm2835_timer: Fix memory leak of timer Sasha Levin
2020-02-14 16:08 ` [PATCH AUTOSEL 4.19 037/252] scsi: ufs: Fix ufshcd_probe_hba() reture value in case ufshcd_scsi_add_wlus() fails Sasha Levin
2020-02-14 16:08 ` [PATCH AUTOSEL 4.19 044/252] ARM: 8952/1: Disable kmemleak on XIP kernels Sasha Levin
2020-02-14 16:08 ` [PATCH AUTOSEL 4.19 081/252] arm64: dts: allwinner: H6: Add PMU mode Sasha Levin
2020-02-14 16:08 ` [PATCH AUTOSEL 4.19 082/252] arm: dts: allwinner: H3: Add PMU node Sasha Levin
2020-02-14 16:08 ` [PATCH AUTOSEL 4.19 083/252] ARM: dts: at91: Reenable UART TX pull-ups Sasha Levin
2020-02-14 16:09 ` [PATCH AUTOSEL 4.19 088/252] ARM: dts: imx6: rdu2: Disable WP for USDHC2 and USDHC3 Sasha Levin
2020-02-14 16:09 ` [PATCH AUTOSEL 4.19 089/252] ARM: dts: imx6: rdu2: Limit USBH1 to Full Speed Sasha Levin
2020-02-14 16:09 ` [PATCH AUTOSEL 4.19 091/252] PCI: iproc: Apply quirk_paxc_bridge() for module as well as built-in Sasha Levin
2020-02-14 16:09 ` [PATCH AUTOSEL 4.19 102/252] Revert "tty/serial: atmel: fix out of range clock divider handling" Sasha Levin
2020-02-14 16:09 ` [PATCH AUTOSEL 4.19 113/252] drm/mediatek: handle events when enabling/disabling crtc Sasha Levin
2020-02-14 16:09 ` [PATCH AUTOSEL 4.19 118/252] dmaengine: imx-sdma: Fix memory leak Sasha Levin
2020-02-14 16:09 ` [PATCH AUTOSEL 4.19 125/252] reset: uniphier: Add SCSSI reset control for each channel Sasha Levin
2020-02-14 16:09 ` [PATCH AUTOSEL 4.19 127/252] clk: sunxi-ng: add mux and pll notifiers for A64 CPU clock Sasha Levin
2020-02-14 16:09 ` [PATCH AUTOSEL 4.19 129/252] clk: uniphier: Add SCSSI clock gate for each channel Sasha Levin
2020-02-14 16:09 ` [PATCH AUTOSEL 4.19 137/252] soc: fsl: qe: remove set but not used variable 'mm_gc' Sasha Levin
2020-02-14 16:09 ` [PATCH AUTOSEL 4.19 139/252] crypto: atmel-sha - fix error handling when setting hmac key Sasha Levin
2020-02-14 16:09 ` [PATCH AUTOSEL 4.19 140/252] ARM: dts: stm32: Add power-supply for DSI panel on stm32f469-disco Sasha Levin
2020-02-14 16:09 ` [PATCH AUTOSEL 4.19 143/252] iommu/arm-smmu-v3: Populate VMID field for CMDQ_OP_TLBI_NH_VA Sasha Levin
2020-02-14 16:10 ` [PATCH AUTOSEL 4.19 148/252] ARM: dts: at91: sama5d3: fix maximum peripheral clock rates Sasha Levin
2020-02-14 16:10 ` [PATCH AUTOSEL 4.19 149/252] ARM: dts: at91: sama5d3: define clock rate range for tcb1 Sasha Levin
2020-02-14 16:10 ` [PATCH AUTOSEL 4.19 155/252] ASoC: atmel: fix build error with CONFIG_SND_ATMEL_SOC_DMA=m Sasha Levin
2020-02-14 16:10 ` [PATCH AUTOSEL 4.19 165/252] arm64: ptrace: nofpsimd: Fail FP/SIMD regset operations Sasha Levin
2020-02-14 16:10 ` [PATCH AUTOSEL 4.19 177/252] iommu/arm-smmu-v3: Use WRITE_ONCE() when changing validity of an STE Sasha Levin
2020-02-14 16:10 ` [PATCH AUTOSEL 4.19 181/252] arm64: fix alternatives with LLVM's integrated assembler Sasha Levin
2020-02-14 16:10 ` [PATCH AUTOSEL 4.19 186/252] ACPI/IORT: Fix 'Number of IDs' handling in iort_id_map() Sasha Levin
2020-02-14 16:11 ` [PATCH AUTOSEL 4.19 218/252] ARM: 8951/1: Fix Kexec compilation issue Sasha Levin

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