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SubjectRe: [PATCH 4/5] x86: entry_64.S: always allocate complete "struct pt_regs"
On 08/04, Oleg Nesterov wrote:
>
> On 08/04, Denys Vlasenko wrote:
> >
> > "why do we need percpu old_rsp thingy?" in particular.
>
> See thread_struct->usersp, current_user_stack_pointer().

Btw, perhaps it makes sense to document that task_pt_regs(current)->sp
is not current_user_stack_pointer() inside system_call_fastpath.

Oleg.



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