patch-2.1.85 linux/include/asm-alpha/softirq.h

• Lines: 86
• Date: Mon Feb 2 13:41:06 1998
• Orig file: v2.1.84/linux/include/asm-alpha/softirq.h
• Orig date: Fri Jan 30 11:28:09 1998

diff -u --recursive --new-file v2.1.84/linux/include/asm-alpha/softirq.h linux/include/asm-alpha/softirq.h
@@ -5,7 +5,7 @@
  * is entirely private to an implementation, it should not be
  * referenced at all outside of this file.
  */
-extern atomic_t __alpha_bh_counter;
+extern unsigned int local_bh_count[NR_CPUS];
 
 #define get_active_bhs()	(bh_mask & bh_active)
 
@@ -43,51 +43,49 @@
 }
 
 /*
- * These use a mask count to correctly handle
- * nested disable/enable calls
- */
-extern inline void disable_bh(int nr)
-{
-	bh_mask &= ~(1 << nr);
-	bh_mask_count[nr]++;
-}
-
-extern inline void enable_bh(int nr)
-{
-	if (!--bh_mask_count[nr])
-		bh_mask |= 1 << nr;
-}
-
-/*
  * start_bh_atomic/end_bh_atomic also nest
  * naturally by using a counter
  */
 extern inline void start_bh_atomic(void)
 {
-#ifdef __SMP__
-	atomic_inc(&__alpha_bh_counter);
-	synchronize_irq();
-#else
-	atomic_inc(&__alpha_bh_counter);
-#endif
+	local_bh_count[smp_processor_id()]++;
+	barrier();
 }
 
 extern inline void end_bh_atomic(void)
 {
-	atomic_dec(&__alpha_bh_counter);
+	barrier();
+	local_bh_count[smp_processor_id()]--;
 }
 
 #ifndef __SMP__
 
 /* These are for the irq's testing the lock */
-#define softirq_trylock(cpu)	(atomic_read(&__alpha_bh_counter) ? \
-				0 : \
-				((atomic_set(&__alpha_bh_counter,1)),1))
-#define softirq_endlock(cpu)	(atomic_set(&__alpha_bh_counter, 0))
+#define softirq_trylock(cpu) \
+  (local_bh_count[cpu] ? 0 : (local_bh_count[cpu] = 1))
+#define softirq_endlock(cpu) \
+  (local_bh_count[cpu] = 0)
 
 #else
 
 #error FIXME
 
 #endif /* __SMP__ */
+
+/*
+ * These use a mask count to correctly handle
+ * nested disable/enable calls
+ */
+extern inline void disable_bh(int nr)
+{
+	bh_mask &= ~(1 << nr);
+	bh_mask_count[nr]++;
+}
+
+extern inline void enable_bh(int nr)
+{
+	if (!--bh_mask_count[nr])
+		bh_mask |= 1 << nr;
+}
+
 #endif /* _ALPHA_SOFTIRQ_H */