park: Reserve park mem before kexec reserved

hulk inclusion
category: feature
bugzilla: 48159
CVE: N/A

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

reserve_crashkernel or reserve_quick_kexec may find one sutiable
memory region and reserves it, which address of the region is
not fixed.

As a result, cpu park reserves memory could be failed while
specified address used by crashkernel or quickkexec.

So, move reserve_park_mem before reserve_crashkernel and
reserve_quick_kexec.

Signed-off-by: Sang Yan <sangyan(a)huawei.com>
Reviewed-by: Jing Xiangfeng <jingxiangfeng(a)huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

arch/arm64/mm/init.c

@@ -590,16 +590,25 @@ void __init arm64_memblock_init(void)
 	else
 		arm64_dma32_phys_limit = PHYS_MASK + 1;
 
+	/*
+	 * Reserve park memory before crashkernel and quick kexec.
+	 * Because park memory must be specified by address, but
+	 * crashkernel and quickkexec may be specified by memory length,
+	 * then find one sutiable memory region to reserve.
+	 *
+	 * So reserve park memory firstly is better, but it may cause
+	 * crashkernel or quickkexec reserving failed.
+	 */
+#ifdef CONFIG_ARM64_CPU_PARK
+	reserve_park_mem();
+#endif
+
 	reserve_crashkernel();
 
 #ifdef CONFIG_QUICK_KEXEC
 	reserve_quick_kexec();
 #endif
 
-#ifdef CONFIG_ARM64_CPU_PARK
-	reserve_park_mem();
-#endif
-
 	reserve_pin_memory_res();
 
 	reserve_elfcorehdr();