linux-kernel - [PATCH 3.19 70/75] arm64: Use the reserved TTBR0 if context switching to the init

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Message-Id: <20150410131711.101670237@linuxfoundation.org>
Date:	Fri, 10 Apr 2015 15:19:36 +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, "Jon Medhurst (Tixy)" <tixy@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>
Subject: [PATCH 3.19 70/75] arm64: Use the reserved TTBR0 if context switching to the init_mm

3.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Catalin Marinas <catalin.marinas@....com>

commit e53f21bce4d35a93b23d8fa1a840860f6c74f59e upstream.

The idle_task_exit() function may call switch_mm() with next ==
&init_mm. On arm64, init_mm.pgd cannot be used for user mappings, so
this patch simply sets the reserved TTBR0.

Reported-by: Jon Medhurst (Tixy) <tixy@...aro.org>
Tested-by: Jon Medhurst (Tixy) <tixy@...aro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm64/include/asm/mmu_context.h |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/arch/arm64/include/asm/mmu_context.h
+++ b/arch/arm64/include/asm/mmu_context.h
@@ -151,6 +151,15 @@ switch_mm(struct mm_struct *prev, struct
 {
 	unsigned int cpu = smp_processor_id();
 
+	/*
+	 * init_mm.pgd does not contain any user mappings and it is always
+	 * active for kernel addresses in TTBR1. Just set the reserved TTBR0.
+	 */
+	if (next == &init_mm) {
+		cpu_set_reserved_ttbr0();
+		return;
+	}
+
 	if (!cpumask_test_and_set_cpu(cpu, mm_cpumask(next)) || prev != next)
 		check_and_switch_context(next, tsk);
 }


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