Re: [PATCH 13/14] x86/ticketlock: add slowpath logic

[Jan Beulich]

>>> On 16.11.10 at 22:08, Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:
> +static inline void __ticket_enter_slowpath(struct arch_spinlock *lock)
> +{
> +	if (sizeof(lock->tickets.tail) == sizeof(u8))
> +		asm (LOCK_PREFIX "orb %1, %0"
> +		     : "+m" (lock->tickets.tail)
> +		     : "i" (TICKET_SLOWPATH_FLAG) : "memory");
> +	else
> +		asm (LOCK_PREFIX "orw %1, %0"
> +		     : "+m" (lock->tickets.tail)
> +		     : "i" (TICKET_SLOWPATH_FLAG) : "memory");
> +}

Came only now to mind: Here and elsewhere, did you try using
%z0 to have gcc produce the opcode suffix character, rather
than having these somewhat ugly if()-s?

Jan

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/