On Tue, Sep 20, 2016 at 09:10:55PM -0400, Brian Gerst wrote:
> Dropping asmlinkage from schedule_tail() would be a better option if possible.

My understanding is that it's still needed for ia64.  AFAICT, ia64
relies on schedule_tail() having the syscall_linkage function attribute.
>From the gcc manual:

  This attribute is used to modify the IA64 calling convention by
  marking all input registers as live at all function exits. This makes
  it possible to restart a system call after an interrupt without having
  to save/restore the input registers. This also prevents kernel data
  from leaking into application code. 

And the ia64 entry code has some similar language:

                 * Invoke schedule_tail(task) while preserving in0-in7, which 
may be needed
                 * in case a system call gets restarted.


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