linux-kernel - [PATCH 04/35] lmb: Add lmb_find

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Date:	Thu, 13 May 2010 17:19:25 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	David Miller <davem@...emloft.net>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH 04/35] lmb: Add lmb_find_area()

it is a wrapper for lmb_find_base

make it more easy for x86 to use lmb. ( rebase )
x86 early_res is using find/reserve pattern instead of alloc.

-v2: Change name to lmb_find_area() according to Michael Ellerman
-v3: Add generic weak version __lmb_find_area()
     so keep the path for fallback to x86 version that handle from low

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
 include/linux/lmb.h |    4 ++++
 lib/lmb.c           |   27 ++++++++++++++++++++++++++-
 2 files changed, 30 insertions(+), 1 deletions(-)

diff --git a/include/linux/lmb.h b/include/linux/lmb.h
index 0b073a3..3c23dc8 100644
--- a/include/linux/lmb.h
+++ b/include/linux/lmb.h
@@ -44,6 +44,10 @@ extern struct lmb lmb;
 extern int lmb_debug;
 extern struct lmb_region lmb_reserved_init_regions[];
 
+u64 __lmb_find_area(u64 ei_start, u64 ei_last, u64 start, u64 end,
+			u64 size, u64 align);
+u64 lmb_find_area(u64 start, u64 end, u64 size, u64 align);
+
 extern void __init lmb_init(void);
 extern void __init lmb_analyze(void);
 extern long lmb_add(phys_addr_t base, phys_addr_t size);
diff --git a/lib/lmb.c b/lib/lmb.c
index 6d49a17..f917dbf 100644
--- a/lib/lmb.c
+++ b/lib/lmb.c
@@ -155,6 +155,31 @@ static phys_addr_t __init lmb_find_base(phys_addr_t size, phys_addr_t align,
 	return LMB_ERROR;
 }
 
+u64 __init __weak __lmb_find_area(u64 ei_start, u64 ei_last, u64 start, u64 end,
+				 u64 size, u64 align)
+{
+	u64 final_start, final_end;
+	u64 mem;
+
+	final_start = max(ei_start, start);
+	final_end = min(ei_last, end);
+
+	if (final_start >= final_end)
+		return LMB_ERROR;
+
+	mem = lmb_find_base(size, align, final_start, final_end);
+
+	return mem;
+}
+
+/*
+ * Find a free area with specified alignment in a specific range.
+ */
+u64 __init __weak lmb_find_area(u64 start, u64 end, u64 size, u64 align)
+{
+	return lmb_find_base(size, align, start, end);
+}
+
 static void __init_lmb lmb_remove_region(struct lmb_type *type, unsigned long r)
 {
 	unsigned long i;
@@ -199,7 +224,7 @@ static int __init_lmb lmb_double_array(struct lmb_type *type)
 		new_array = kmalloc(new_size, GFP_KERNEL);
 		addr = new_array == NULL ? LMB_ERROR : __pa(new_array);
 	} else
-		addr = lmb_find_base(new_size, sizeof(struct lmb_region), 0, LMB_ALLOC_ACCESSIBLE);
+		addr = lmb_find_area(0, lmb.current_limit, new_size, sizeof(struct lmb_region));
 	if (addr == LMB_ERROR) {
 		pr_err("lmb: Failed to double %s array from %ld to %ld entries !\n",
 		       lmb_type_name(type), type->max, type->max * 2);
-- 
1.6.4.2

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