From 4d88dfc7abf9e2b566136037bc405942c35a452c Mon Sep 17 00:00:00 2001
From: fche <fche>
Date: Tue, 29 May 2007 19:24:36 +0000
Subject: 2007-05-29  Frank Ch. Eigler  <fche@redhat.com>

	PR 2224
	* map.h (NEED_MAP_LOCKS): New config macro, defaults to 0.
	(MAP_GET_CPU, MAP_PUT_CPU): Wrappers, default to ~no-op.
	* map.c (_stp_pmap_clear,agg): Use them.
	* pmap-gen.c (_stp_pmap_new,set,add,get_cpu,get,del): Ditto.
---
 runtime/map.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'runtime/map.h')

diff --git a/runtime/map.h b/runtime/map.h
index 4bb8aee2..f89dc521 100644
--- a/runtime/map.h
+++ b/runtime/map.h
@@ -19,6 +19,23 @@
  * @{
  */
 
+
+/* Include map spinlocks only on demand.  Otherwise, assume that
+   caller does the right thing. */
+#ifndef NEED_MAP_LOCKS
+#define NEED_MAP_LOCKS 0
+#endif
+
+#if NEED_MAP_LOCKS
+#define MAP_GET_CPU() get_cpu()
+#define MAP_PUT_CPU() put_cpu()
+#else
+/* get/put_cpu wrappers.  Unnecessary if caller is already atomic. */
+#define MAP_GET_CPU() smp_processor_id()
+#define MAP_PUT_CPU() do {} while (0)
+#endif
+
+
 /* This sets the size of the hash table. */
 #ifndef HASH_TABLE_BITS
 #define HASH_TABLE_BITS 8
@@ -102,7 +119,9 @@ struct map_root {
 
 	int data_offset;
 
+#ifdef NEED_MAP_LOCKS
 	spinlock_t lock;
+#endif
 
 	/* the hash table for this array */
 	struct hlist_head hashes[HASH_TABLE_SIZE];
-- 
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