of: Enable crashkernel=X,high to support kexec option -s

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I545H8
CVE: NA

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For "crashkernel=X,high", there must be two crash regions: high=crashk_res
and low=crashk_low_res. But now the syscall kexec_file_load() only add the
crashk_res into "linux,usable-memory-range", this causes the second kernel
to have no available dma memory. Fix it like kexec tool do for option -c.
Signed-off-by: NZhen Lei <thunder.leizhen@huawei.com>
Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/of/kexec.c

@@ -396,6 +396,15 @@ void *of_kexec_alloc_and_setup_fdt(const struct kimage *image,
 				crashk_res.end - crashk_res.start + 1);
 		if (ret)
 			goto out;
+
+		if (crashk_low_res.end) {
+			ret = fdt_appendprop_addrrange(fdt, 0, chosen_node,
+					FDT_PROP_MEM_RANGE,
+					crashk_low_res.start,
+					crashk_low_res.end - crashk_low_res.start + 1);
+			if (ret)
+				goto out;
+		}
 	}
 
 	/* add bootargs */