linux-kernel - [RFC PATCH v4 1/2] lmb: seperate region array from lmb

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Date:	Tue, 23 Mar 2010 22:36:15 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: [RFC PATCH v4 1/2] lmb: seperate region array from lmb_region struct


lmb_init() connect them back.

also add nr_regions in lmb_region to tack the region array size.

-v3: seperate lmb core change to seperated patch
-v4: according to Ingo, change >= x -1 to > x
     change region_array_size to nr_regions

Signed-off-by: Yinghai Lu <yinghai@...nel.org>

---
 include/linux/lmb.h |    5 ++++-
 lib/lmb.c           |    9 ++++++++-
 2 files changed, 12 insertions(+), 2 deletions(-)

Index: linux-2.6/include/linux/lmb.h
===================================================================
--- linux-2.6.orig/include/linux/lmb.h
+++ linux-2.6/include/linux/lmb.h
@@ -26,7 +26,8 @@ struct lmb_property {
 struct lmb_region {
 	unsigned long cnt;
 	u64 size;
-	struct lmb_property region[MAX_LMB_REGIONS+1];
+	struct lmb_property *region;
+	unsigned long nr_regions;
 };
 
 struct lmb {
@@ -37,6 +38,8 @@ struct lmb {
 };
 
 extern struct lmb lmb;
+extern struct lmb_property lmb_memory_region[MAX_LMB_REGIONS + 1];
+extern struct lmb_property lmb_reserved_region[MAX_LMB_REGIONS + 1];
 
 extern void __init lmb_init(void);
 extern void __init lmb_analyze(void);
Index: linux-2.6/lib/lmb.c
===================================================================
--- linux-2.6.orig/lib/lmb.c
+++ linux-2.6/lib/lmb.c
@@ -18,6 +18,8 @@
 #define LMB_ALLOC_ANYWHERE	0
 
 struct lmb lmb;
+struct lmb_property lmb_memory_region[MAX_LMB_REGIONS + 1];
+struct lmb_property lmb_reserved_region[MAX_LMB_REGIONS + 1];
 
 static int lmb_debug;
 
@@ -106,6 +108,11 @@ static void lmb_coalesce_regions(struct
 
 void __init lmb_init(void)
 {
+	lmb.memory.region   = lmb_memory_region;
+	lmb.reserved.region = lmb_reserved_region;
+	lmb.memory.nr_regions   = ARRAY_SIZE(lmb_memory_region);
+	lmb.reserved.nr_regions = ARRAY_SIZE(lmb_reserved_region);
+
 	/* Create a dummy zero size LMB which will get coalesced away later.
 	 * This simplifies the lmb_add() code below...
 	 */
@@ -169,7 +176,7 @@ static long lmb_add_region(struct lmb_re
 
 	if (coalesced)
 		return coalesced;
-	if (rgn->cnt >= MAX_LMB_REGIONS)
+	if (rgn->cnt > rgn->nr_regions)
 		return -1;
 
 	/* Couldn't coalesce the LMB, so add it to the sorted table. */
--
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