From a54123e27779049d27d21e6c8adfee73aa2c0734 Mon Sep 17 00:00:00 2001
From: Bob Breuer
Date: Thu, 23 Mar 2006 22:36:19 -0800
Subject: [SPARC]: Try to start getting SMP back into shape.

Todo items:
 - IRQ_INPROGRESS flag - use sparc64 irq buckets, or generic irq_desc?
 - sun4d
 - re-indent large chunks of sun4m_smp.c
 - some places assume sequential cpu numbering (i.e. 0,1 instead of 0,2)

Last I checked (with 2.6.14), random programs segfault with dual
HyperSPARC.  And with SuperSPARC II's, it seems stable but will
eventually die from a write lock error (wrong lock owner or something).

I haven't tried the HyperSPARC + highmem combination recently, so that
may still be a problem.

Signed-off-by: David S. Miller <davem@davemloft.net>
---
 include/asm-sparc/cpudata.h  |  1 +
 include/asm-sparc/smp.h      |  9 +--------
 include/asm-sparc/spinlock.h | 25 ++++++++++++++++++++++---
 3 files changed, 24 insertions(+), 11 deletions(-)

(limited to 'include/asm-sparc')

diff --git a/include/asm-sparc/cpudata.h b/include/asm-sparc/cpudata.h
index ec0d9ef90a3b..a2c4d51d36c4 100644
--- a/include/asm-sparc/cpudata.h
+++ b/include/asm-sparc/cpudata.h
@@ -18,6 +18,7 @@ typedef struct {
 	unsigned int counter;
 	int prom_node;
 	int mid;
+	int next;
 } cpuinfo_sparc;
 
 DECLARE_PER_CPU(cpuinfo_sparc, __cpu_data);
diff --git a/include/asm-sparc/smp.h b/include/asm-sparc/smp.h
index 580c51d011df..98c46e3fbe8a 100644
--- a/include/asm-sparc/smp.h
+++ b/include/asm-sparc/smp.h
@@ -81,16 +81,9 @@ static inline int smp_call_function(void (*func)(void *info), void *info, int no
 	return 0;
 }
 
-extern __volatile__ int __cpu_number_map[NR_CPUS];
-extern __volatile__ int __cpu_logical_map[NR_CPUS];
-
 static inline int cpu_logical_map(int cpu)
 {
-	return __cpu_logical_map[cpu];
-}
-static inline int cpu_number_map(int cpu)
-{
-	return __cpu_number_map[cpu];
+	return cpu;
 }
 
 static inline int hard_smp4m_processor_id(void)
diff --git a/include/asm-sparc/spinlock.h b/include/asm-sparc/spinlock.h
index e344c98a6f5f..3350c90c7869 100644
--- a/include/asm-sparc/spinlock.h
+++ b/include/asm-sparc/spinlock.h
@@ -94,7 +94,7 @@ static inline void __read_lock(raw_rwlock_t *rw)
 #define __raw_read_lock(lock) \
 do {	unsigned long flags; \
 	local_irq_save(flags); \
-	__raw_read_lock(lock); \
+	__read_lock(lock); \
 	local_irq_restore(flags); \
 } while(0)
 
@@ -114,11 +114,11 @@ static inline void __read_unlock(raw_rwlock_t *rw)
 #define __raw_read_unlock(lock) \
 do {	unsigned long flags; \
 	local_irq_save(flags); \
-	__raw_read_unlock(lock); \
+	__read_unlock(lock); \
 	local_irq_restore(flags); \
 } while(0)
 
-extern __inline__ void __raw_write_lock(raw_rwlock_t *rw)
+static inline void __raw_write_lock(raw_rwlock_t *rw)
 {
 	register raw_rwlock_t *lp asm("g1");
 	lp = rw;
@@ -131,9 +131,28 @@ extern __inline__ void __raw_write_lock(raw_rwlock_t *rw)
 	: "g2", "g4", "memory", "cc");
 }
 
+static inline int __raw_write_trylock(raw_rwlock_t *rw)
+{
+	unsigned int val;
+
+	__asm__ __volatile__("ldstub [%1 + 3], %0"
+			     : "=r" (val)
+			     : "r" (&rw->lock)
+			     : "memory");
+
+	if (val == 0) {
+		val = rw->lock & ~0xff;
+		if (val)
+			((volatile u8*)&rw->lock)[3] = 0;
+	}
+
+	return (val == 0);
+}
+
 #define __raw_write_unlock(rw)	do { (rw)->lock = 0; } while(0)
 
 #define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock)
+#define __raw_read_trylock(lock) generic__raw_read_trylock(lock)
 
 #endif /* !(__ASSEMBLY__) */
 
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