On Tue, Apr 03, 2018 at 01:49:09PM +0100, David Howells wrote: > Andrea Parri <[email protected]> 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.
You mean "unlocked"? (aka, return 0) Andrea > > David
