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Date: Wed, 15 May 2019 12:55:49 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Tigran Tadevosyan <tigran.tadevosyan@....com>, Vladimir Murzin <vladimir.murzin@....com>, Russell King <rmk+kernel@...linux.org.uk>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 4.19 058/113] ARM: 8856/1: NOMMU: Fix CCR register faulty initialization when MPU is disabled [ Upstream commit c3143967807adb1357c36b68a7563fc0c4e1f615 ] When CONFIG_ARM_MPU is not defined, the base address of v7M SCB register is not initialized with correct value. This prevents enabling I/D caches when the L1 cache poilcy is applied in kernel. Fixes: 3c24121039c9da14692eb48f6e39565b28c0f3cf ("ARM: 8756/1: NOMMU: Postpone MPU activation till __after_proc_init") Signed-off-by: Tigran Tadevosyan <tigran.tadevosyan@....com> Signed-off-by: Vladimir Murzin <vladimir.murzin@....com> Signed-off-by: Russell King <rmk+kernel@...linux.org.uk> Signed-off-by: Sasha Levin <sashal@...nel.org> --- arch/arm/kernel/head-nommu.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/kernel/head-nommu.S b/arch/arm/kernel/head-nommu.S index ec29de2500764..cab89479d15ef 100644 --- a/arch/arm/kernel/head-nommu.S +++ b/arch/arm/kernel/head-nommu.S @@ -133,9 +133,9 @@ __secondary_data: */ .text __after_proc_init: -#ifdef CONFIG_ARM_MPU M_CLASS(movw r12, #:lower16:BASEADDR_V7M_SCB) M_CLASS(movt r12, #:upper16:BASEADDR_V7M_SCB) +#ifdef CONFIG_ARM_MPU M_CLASS(ldr r3, [r12, 0x50]) AR_CLASS(mrc p15, 0, r3, c0, c1, 4) @ Read ID_MMFR0 and r3, r3, #(MMFR0_PMSA) @ PMSA field -- 2.20.1
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