[PATCH 1/2] Linux/x86: Update cancel_jmp_buf to match __jmp_buf_tag [BZ #22563]

[Florian Weimer]

On 12/18/2017 01:25 PM, H.J. Lu wrote:
> If we don't restore shadow stack pointer, when we jump back to  tst-foo.c:45,
> shadow stack won't match call stack when threadfunc () returns.

But threadfunc never returns if the thread is canceled, so I'm still as 
puzzled as before.  Sorry.

Florian