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authorHelge Deller <deller@gmx.de>2020-04-05 22:08:07 +0200
committerHelge Deller <deller@gmx.de>2020-04-05 22:16:38 +0200
commit2772f0efd5bbd5413db3d22e363b779ca0fa5310 (patch)
treef45c9fbcc4d43af0290ab167579ab8ea6d00a409 /arch/parisc/include
parent997ba6573685451c37005a5b74a4baa3c16b5231 (diff)
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: Helge Deller <deller@gmx.de>
Diffstat (limited to 'arch/parisc/include')
-rw-r--r--arch/parisc/include/asm/spinlock.h25
1 files changed, 17 insertions, 8 deletions
diff --git a/arch/parisc/include/asm/spinlock.h b/arch/parisc/include/asm/spinlock.h
index 197d2247e4db..51582eacb7ec 100644
--- a/arch/parisc/include/asm/spinlock.h
+++ b/arch/parisc/include/asm/spinlock.h
@@ -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();
+ cpu_relax();
+ local_irq_restore(flags_dis);
+ }
}
#define arch_spin_lock_flags arch_spin_lock_flags