On 12/12/2014 04:10 AM, Michael Ellerman wrote: > On Thu, 2014-11-12 at 16:44:54 UTC, Hari Bathini wrote: >> In LE kernel, we currently have a hack for kexec that resets the exception >> endian >> before starting a new kernel as the kernel that is loaded could be a big >> endian >> or a little endian kernel. In kdump case, resetting exception endian fails >> when >> one or more cpus is disabled. But in case of kdump, we can conveniently >> ignore >> resetting endianess as crashkernel is always of same endianess as primary >> kernel. > > No, it's not guaranteed to be the same endianess. > > That tends to be what people do in practice, but it's not an assumption you > can > hard code.
Agree. The other solution could be to wakeup offline CPUs in crash path as we do it in normal kexec path. PHYP expects all partitions processors MSR[EE] = 0 while we call pseries_big_endian_exceptions(). Waking up offline CPUs will help to achieve that. But since we are already in crashed kernel context I am not sure how safe is to call wake_offline_cpus(). Thanks, -Mahesh. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
