ARM: EXYNOS: Annotate iomem and pm_data pointers __ro_after_init

The pointers to __iomem sysram and exynos_pm_data are set only during
initcalls.  Later the pointers itself are used only in read-only way so
we can mark them __ro_after_init to increase code safeness.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

arch/arm/mach-exynos/exynos.c

@@ -45,8 +45,8 @@ static struct platform_device exynos_cpuidle = {
 	.id                = -1,
 };
 
-void __iomem *sysram_base_addr;
-void __iomem *sysram_ns_base_addr;
+void __iomem *sysram_base_addr __ro_after_init;
+void __iomem *sysram_ns_base_addr __ro_after_init;
 
 void __init exynos_sysram_init(void)
 {

arch/arm/mach-exynos/mcpm-exynos.c

@@ -32,7 +32,7 @@
 #define EXYNOS5420_USE_ARM_CORE_DOWN_STATE	BIT(29)
 #define EXYNOS5420_USE_L2_COMMON_UP_STATE	BIT(30)
 
-static void __iomem *ns_sram_base_addr;
+static void __iomem *ns_sram_base_addr __ro_after_init;
 
 /*
  * The common v7_exit_coherency_flush API could not be used because of the

arch/arm/mach-exynos/suspend.c

@@ -66,7 +66,7 @@ struct exynos_pm_data {
 	int (*cpu_suspend)(unsigned long);
 };
 
-static const struct exynos_pm_data *pm_data;
+static const struct exynos_pm_data *pm_data __ro_after_init;
 
 static int exynos5420_cpu_state;
 static unsigned int exynos_pmu_spare3;