locking/qspinlock,x86: Clarify virt_spin_lock_key

#endif

#ifdef CONFIG_PARAVIRT

/*

 * virt_spin_lock_key - enables (by default) the virt_spin_lock() hijack.

 *

 * Native (and PV wanting native due to vCPU pinning) should disable this key.

 * It is done in this backwards fashion to only have a single direction change,

 * which removes ordering between native_pv_spin_init() and HV setup.

 */

DECLARE_STATIC_KEY_TRUE(virt_spin_lock_key);

void native_pv_lock_init(void) __init;

/*

 * Shortcut for the queued_spin_lock_slowpath() function that allows

 * virt to hijack it.

 *

 * Returns:

 *   true - lock has been negotiated, all done;

 *   false - queued_spin_lock_slowpath() will do its thing.

 */

#define virt_spin_lock virt_spin_lock

static inline bool virt_spin_lock(struct qspinlock *lock)

{