[PATCH] nptl: Use SA_RESTART for SIGCANCEL handler

[Florian Weimer]

* Adhemerval Zanella:

> * The pthread cancellation handler is now installed with SA_RESTART
>   and pthread_cancel will always send the internal SIGCANCEL on a
>   cancellation request.  It should not be visible to application since 
>   the cancellation handler should either act upon cancellation (if 
>   asynchronous cancellation is enabled) or ignore the cancellation 
>   internal signal.  However there is buggy kernel interfaces (for
>   instance some CIFS modules) that could still see spurious EINTR
>   error when cancellation interrupts a blocking syscall.

Suggest: “some CIFS [versions]”

Rest looks okay to me, thanks.

Florian