s390/kexec_file: fix initrd location for kdump kernel

initrd_start must not point at the location the initrd is loaded into
the crashkernel memory but at the location it will be after the
crashkernel memory is swapped with the memory at 0.

Fixes: ee337f5 ("s390/kexec_file: Add crash support to image loader")
Reported-by: Lianbo Jiang <[email protected]>
Signed-off-by: Philipp Rudo <[email protected]>
Tested-by: Lianbo Jiang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Christian Borntraeger <[email protected]>
Signed-off-by: Vasily Gorbik <[email protected]>

Author: Philipp Rudo

arch/s390/kernel/machine_kexec_file.c

@@ -151,7 +151,7 @@ static int kexec_file_add_initrd(struct kimage *image,
 		buf.mem += crashk_res.start;
 	buf.memsz = buf.bufsz;
 
-	data->parm->initrd_start = buf.mem;
+	data->parm->initrd_start = data->memsz;
 	data->parm->initrd_size = buf.memsz;
 	data->memsz += buf.memsz;