Revert "parisc: Improve interrupt handling in arch_spin_lock_flags()"

This reverts commit 2772f0efd5bbd5413db3d22e363b779ca0fa5310.
It turns out that we want to implement the spinlock code differently.

Signed-off-by: Helge Deller <deller@gmx.de>
Cc: <stable@vger.kernel.org> # v5.7+

diff --git a/arch/parisc/include/asm/spinlock.h b/arch/parisc/include/asm/spinlock.h
index 70fecb8..d2a3337 100644 (file)
--- a/arch/parisc/include/asm/spinlock.h
+++ b/arch/parisc/include/asm/spinlock.h
@@ -10,34 +10,25 @@
 static inline int arch_spin_is_locked(arch_spinlock_t *x)
 {
        volatile unsigned int *a = __ldcw_align(x);
-       smp_mb();
        return *a == 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();
-}
+#define arch_spin_lock(lock) arch_spin_lock_flags(lock, 0)
 
 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) {
-               local_save_flags(flags_dis);
-               local_irq_restore(flags);
+       while (__ldcw(a) == 0)
                while (*a == 0)
-                       cpu_relax();
-               local_irq_restore(flags_dis);
-       }
+                       if (flags & PSW_SM_I) {
+                               local_irq_enable();
+                               cpu_relax();
+                               local_irq_disable();
+                       } else
+                               cpu_relax();
 }
 #define arch_spin_lock_flags arch_spin_lock_flags