selftest/kho: update generation of initrd

Use nolibc include directory rather than include a cumulative nolibc.h on
the compiler command line and replace use of 'sudo cpio' with
usr/gen_init_cpio.

While on it fix spelling of KHO_FINALIZE

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Mike Rapoport (Microsoft) <[e-mail]>
Suggested-by: Thomas Weißschuh <[e-mail]>
Cc: Alexander Graf <[e-mail]>
Cc: Baoquan He <[e-mail]>
Cc: Changyuan Lyu <[e-mail]>
Cc: Pasha Tatashin <[e-mail]>
Cc: Pratyush Yadav <[e-mail]>
Cc: Shuah Khan <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

tools/testing/selftests/kho/init.c

···
 // SPDX-License-Identifier: GPL-2.0
 
-#ifndef NOLIBC
-#include <errno.h>
 #include <stdio.h>
 #include <unistd.h>
 #include <fcntl.h>
-#include <syscall.h>
+#include <sys/syscall.h>
 #include <sys/mount.h>
 #include <sys/reboot.h>
-#endif
+#include <linux/kexec.h>
 
 /* from arch/x86/include/asm/setup.h */
 #define COMMAND_LINE_SIZE	2048
 
-/* from include/linux/kexex.h */
-#define KEXEC_FILE_NO_INITRAMFS	0x00000004
-
-#define KHO_FINILIZE "/debugfs/kho/out/finalize"
+#define KHO_FINALIZE "/debugfs/kho/out/finalize"
 #define KERNEL_IMAGE "/kernel"
 
 static int mount_filesystems(void)
···
 	const char enable[] = "1";
 	int fd;
 
-	fd = open(KHO_FINILIZE, O_RDWR);
+	fd = open(KHO_FINALIZE, O_RDWR);
 	if (fd < 0)
 		return -1;
 

tools/testing/selftests/kho/vmtest.sh

···
 
 tmp_dir=$(mktemp -d /tmp/kho-test.XXXXXXXX)
 headers_dir="$tmp_dir/usr"
-initrd_dir="$tmp_dir/initrd"
 initrd="$tmp_dir/initrd.cpio"
 
 source "$test_dir/../kselftest/ktap_helpers.sh"
···
 function mkinitrd() {
 	local kernel=$1
 
-	mkdir -p "$initrd_dir"/{dev,debugfs,proc}
-	sudo mknod "$initrd_dir/dev/console" c 5 1
+	"$CROSS_COMPILE"gcc -s -static -Os -nostdinc -nostdlib \
+			-fno-asynchronous-unwind-tables -fno-ident \
+			-I "$headers_dir/include" \
+			-I "$kernel_dir/tools/include/nolibc" \
+			-o "$tmp_dir/init" "$test_dir/init.c"
 
-	"$CROSS_COMPILE"gcc -s -static -Os -nostdinc -I"$headers_dir/include" \
-			-fno-asynchronous-unwind-tables -fno-ident -nostdlib \
-			-include "$test_dir/../../../include/nolibc/nolibc.h" \
-			-o "$initrd_dir/init" "$test_dir/init.c" \
+	cat > "$tmp_dir/cpio_list" <<EOF
+dir /dev 0755 0 0
+dir /proc 0755 0 0
+dir /debugfs 0755 0 0
+nod /dev/console 0600 0 0 c 5 1
+file /init $tmp_dir/init 0755 0 0
+file /kernel $kernel 0644 0 0
+EOF
 
-	cp "$kernel" "$initrd_dir/kernel"
-
-	pushd "$initrd_dir" &>/dev/null
-	find . | cpio -H newc --create > "$initrd" 2>/dev/null
-	popd &>/dev/null
+	"$build_dir/usr/gen_init_cpio" "$tmp_dir/cpio_list" > "$initrd"
 }
 
 function run_qemu() {