Andrea Parri <andrea.pa...@amarulasolutions.com> wrote: > +/** > + * spin_is_locked() - Check whether a spinlock is locked. > + * @lock: Pointer to the spinlock. > + * > + * This function is NOT required to provide any memory ordering > + * guarantees; it could be used for debugging purposes or, when > + * additional synchronization is needed, accompanied with other > + * constructs (memory barriers) enforcing the synchronization. > + * > + * Return: 1, if @lock is (found to be) locked; 0, otherwise.
It's more complicated than that. This function is dangerous and should be used with extreme care. In the case where CONFIG_SMP=n the value is locked one way or the other and it might be the wrong way. David
