* Benjamin Berg <benjamin@xxxxxxxxxxxxxxxx> wrote: > > Note that this patch, while it still applies cleanly, crashes/hangs > > the x86-64 defconfig kernel bootup in the early boot phase in a KVM > > guest bootup. > > Oh, outch. It seems that arch_task_struct_size can actually become > smaller than sizeof(init_task) if the CPU does not have certain > features. > > See fpu__init_task_struct_size, which does: > > int task_size = sizeof(struct task_struct); > task_size -= sizeof(current->thread.fpu.__fpstate.regs); > task_size += fpu_kernel_cfg.default_size; > > I'll submit a new version of the patch and then also switch to use > memcpy_and_pad. Thank you! Ingo
