[Crash-utility] [PATCH] diskdump: Allow zero CPUs for s390

Hi Dave, For s390 there are cases where makedumpfile generated dumps do not have CPU information in the dump header. This happens when old s390 dump tools are used to create a dump that do not write the CPU information into the s390 dump header. We can deal with this situation because we have a fallback that gets the CPU register information out of memory (see s390x_get_lowcore). So for s390 it would be better that we only get a warning, when crash does not find CPU information in a makedumpfile generated dump. Signed-off-by: Michael Holzheu <holzheu(a)linux.vnet.ibm.com&gt; --- diskdump.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/diskdump.c +++ b/diskdump.c @@ -369,7 +369,10 @@ restart: error(INFO, "%s: invalid nr_cpus value: %d\n", DISKDUMP_VALID() ? "diskdump" : "compressed kdump", header->nr_cpus); - goto err; +#if !defined(S390) && !defined(S390X) + /* s390 can get register information also from memory */ + goto err; +#endif } /* read sub header */