[PATCH] i386:kexec-bzImage: Use "\0" as command line instead of empty command line

[Wang YanQing]

I get garbage output of /proc/cmdline and in dmesg when I
use kexec to load new kernel bzImage without append command
line like below:

kexec -l bzImage --initrd=initramfs.
This patch fix it.

Signed-off-by: Wang YanQing <udknight at gmail.com>
---
 kexec/arch/i386/kexec-bzImage.c | 3 +++
 kexec/arch/i386/kexec-elf-x86.c | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/kexec/arch/i386/kexec-bzImage.c b/kexec/arch/i386/kexec-bzImage.c
index 99fd790..29f280d 100644
--- a/kexec/arch/i386/kexec-bzImage.c
+++ b/kexec/arch/i386/kexec-bzImage.c
@@ -435,6 +435,9 @@ int bzImage_load(int argc, char **argv, const char *buf, off_t len,
 	command_line_len = 0;
 	if (command_line) {
 		command_line_len = strlen(command_line) +1;
+	} else {
+	    command_line = strdup("\0");
+	    command_line_len = 1;
 	}
 	ramdisk_buf = 0;
 	if (ramdisk) {
diff --git a/kexec/arch/i386/kexec-elf-x86.c b/kexec/arch/i386/kexec-elf-x86.c
index e62ebcb..788a209 100644
--- a/kexec/arch/i386/kexec-elf-x86.c
+++ b/kexec/arch/i386/kexec-elf-x86.c
@@ -161,6 +161,9 @@ int elf_x86_load(int argc, char **argv, const char *buf, off_t len,
 	command_line_len = 0;
 	if (command_line) {
 		command_line_len = strlen(command_line) +1;
+	} else {
+	    command_line = strdup("\0");
+	    command_line_len = 1;
 	}
 
 	/* Need to append some command line parameters internally in case of
-- 
1.7.12.4.dirty