diff -ruN postgresql-8.0.3-old/src/backend/storage/lmgr/s_lock.c postgresql-8.0.3/src/backend/storage/lmgr/s_lock.c
--- postgresql-8.0.3-old/src/backend/storage/lmgr/s_lock.c	2004-12-31 23:01:05.000000000 +0100
+++ postgresql-8.0.3/src/backend/storage/lmgr/s_lock.c	2005-08-23 19:30:19.000000000 +0200
@@ -172,7 +172,7 @@
 #endif   /* __m68k__ */
 
 
-#if defined(__mips__) && !defined(__sgi)
+#if defined(__mips__) && !defined(__sgi) && !defined(__linux__)
 static void
 tas_dummy()
 {
diff -ruN postgresql-8.0.3-old/src/include/storage/s_lock.h postgresql-8.0.3/src/include/storage/s_lock.h
--- postgresql-8.0.3-old/src/include/storage/s_lock.h	2005-08-23 19:30:18.000000000 +0200
+++ postgresql-8.0.3/src/include/storage/s_lock.h	2005-08-23 19:31:29.000000000 +0200
@@ -445,7 +445,32 @@
 #define HAS_TEST_AND_SET
 
 typedef unsigned int slock_t;
-#endif
+
+#define TAS(lock) tas(lock)
+
+static __inline__ int
+tas(volatile slock_t *lock)
+{
+	register volatile slock_t *__l = lock;
+        register int __r;
+
+        __asm__ __volatile__(
+	       "       .set push           \n"
+	       "       .set mips2          \n"
+	       "       .set noreorder      \n"
+	       "       .set nomacro        \n"
+	       "1:     ll      %0, %1      \n"
+	       "       bne     %0, $0, 1f  \n"
+	       "        xori   %0, 1       \n"
+	       "       sc      %0, %1      \n"
+	       "       beq     %0, $0, 1b  \n"
+	       "        sync               \n"
+	       "1:     .set pop              "
+	       : "=&r" (__r), "+R" (*__l));
+	return __r;
+}
+
+#endif /* mips */
 
 
 #endif	/* __GNUC__ */