On 01/12, Will Drewry wrote: > > On Thu, Jan 12, 2012 at 10:22 AM, Oleg Nesterov <oleg@xxxxxxxxxx> wrote: > >> + */ > >> + regs = seccomp_get_regs(regs_tmp, ®s_size); > > > > Stupid question. I am sure you know what are you doing ;) and I know > > nothing about !x86 arches. > > > > But could you explain why it is designed to use user_regs_struct ? > > Why we can't simply use task_pt_regs() and avoid the (costly) regsets? > > So on x86 32, it would work since user_regs_struct == task_pt_regs > (iirc), but on x86-64 > and others, that's not true. Yes sure, I meant that userpace should use pt_regs too. > If it would be appropriate to expose pt_regs to userspace, then I'd > happily do so :) Ah, so that was the reason. But it is already exported? At least I see the "#ifndef __KERNEL__" definition in arch/x86/include/asm/ptrace.h. Once again, I am not arguing, just trying to understand. And I do not know if this definition is part of abi. Oleg. -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
