mips: Add '--reuse-cmdline' optional parameter support

This patch adds an option "--reuse-cmdline" for people that are lazy
in typing --append="$(cat /proc/cmdline)", which will directly use the
command line of the currently running system.

Signed-off-by: Youling Tang <tangyouling@loongson.cn>
Signed-off-by: Simon Horman <horms@verge.net.au>

1 files changed, 4 insertions, 0 deletions

diff --git a/kexec/arch/mips/kexec-mips.c b/kexec/arch/mips/kexec-mips.c
index 415c2ed..a9c6a09 100644
--- a/kexec/arch/mips/kexec-mips.c
+++ b/kexec/arch/mips/kexec-mips.c
@@ -89,6 +89,7 @@ void arch_usage(void)
 	"    --append=STRING       Set the kernel command line to STRING.\n"
 	"    --dtb=FILE            Use FILE as the device tree blob.\n"
 	"    --initrd=FILE         Use FILE as initial ramdisk.\n"
+	"    --reuse-cmdline       Use kernel command line from running system.\n"
 	);
 }
 
@@ -115,6 +116,9 @@ int arch_process_options(int argc, char **argv)
 		case OPT_APPEND:
 			arch_options.command_line = optarg;
 			break;
+		case OPT_REUSE_CMDLINE:
+			arch_options.command_line = get_command_line();
+			break;
 		case OPT_DTB:
 			arch_options.dtb_file = optarg;
 			break;