Commit 2772f0ef authored by Helge Deller's avatar Helge Deller

parisc: Improve interrupt handling in arch_spin_lock_flags()

Rewrite arch_spin_lock() and arch_spin_lock_flags() to not re-enable and
disable the PSW_SM_I interrupt flag too often.
Signed-off-by: default avatarHelge Deller <deller@gmx.de>
parent 997ba657
......@@ -10,25 +10,34 @@
static inline int arch_spin_is_locked(arch_spinlock_t *x)
{
volatile unsigned int *a = __ldcw_align(x);
smp_mb();
return *a == 0;
}
#define arch_spin_lock(lock) arch_spin_lock_flags(lock, 0)
static inline void arch_spin_lock(arch_spinlock_t *x)
{
volatile unsigned int *a;
a = __ldcw_align(x);
while (__ldcw(a) == 0)
while (*a == 0)
cpu_relax();
}
static inline void arch_spin_lock_flags(arch_spinlock_t *x,
unsigned long flags)
{
volatile unsigned int *a;
unsigned long flags_dis;
a = __ldcw_align(x);
while (__ldcw(a) == 0)
while (__ldcw(a) == 0) {
local_save_flags(flags_dis);
local_irq_restore(flags);
while (*a == 0)
if (flags & PSW_SM_I) {
local_irq_enable();
cpu_relax();
local_irq_disable();
} else
cpu_relax();
local_irq_restore(flags_dis);
}
}
#define arch_spin_lock_flags arch_spin_lock_flags
......
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