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kernel: Split _Swap() API into irqlock and spinlock variants

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We want a _Swap() variant that can atomically release/restore a
spinlock state in addition to the legacy irqlock.  The function as it
was is now named "_Swap_irqlock()", while _Swap() now refers to a
spinlock and takes two arguments.  The former will be going away once
existing users (not that many!  Swap() is an internal API, and the
long port away from legacy irqlocking is going to be happening mostly
in drivers) are ported to spinlocks.

Obviously on uniprocessor setups, these produce identical code.  But
SMP requires that the correct API be used to maintain the global lock.

Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
This commit is contained in:
Andy Ross 2018-07-24 10:42:12 -07:00 • committed by Anas Nashif
commit aa6e21c24c
10 changed files with 68 additions and 18 deletions
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14
include/spinlock.h
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@ -81,4 +81,18 @@ static ALWAYS_INLINE void k_spin_unlock(struct k_spinlock *l,
_arch_irq_unlock(key.key);
}
/* Internal function: releases the lock, but leaves local interrupts
* disabled
*/
static ALWAYS_INLINE void k_spin_release(struct k_spinlock *l)
{
#ifdef SPIN_VALIDATE
__ASSERT(z_spin_unlock_valid(l), "Not my spinlock!");
#endif
#ifdef CONFIG_SMP
atomic_clear(&l->locked);
#endif
}
#endif /* ZEPHYR_INCLUDE_SPINLOCK_H_ */