[PATCH 2/5] arm64: Fix the soft_restart routine

[Geoff Levand]

Change the soft_restart() routine to call cpu_reset() at its identity mapped
physical address.

The cpu_reset() routine must be called at its identity mapped physical address
so that when the MMU is turned off the instruction pointer will be at the correct
location in physical memory.

Signed-off-by: Geoff Levand <geoff at infradead.org> for Huawei, Linaro
---
 arch/arm64/kernel/process.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index de17c89..985eb42 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -72,7 +72,13 @@ static void setup_restart(void)
 void soft_restart(unsigned long addr)
 {
 	setup_restart();
-	cpu_reset(addr);
+
+	/*
+	 * cpu_reset turns the MMU off, so must be called at its identity
+	 * mapped physical address.
+	 */
+
+	(*(void(*)(unsigned long))virt_to_phys(cpu_reset))(addr);
 }
 
 /*
-- 
1.8.1.2