linux-kernel - [PATCH 05/43] memblock/arm: pfn_valid uses memblock_is

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Date:	Fri,  6 Aug 2010 15:14:46 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	linux-kernel@...r.kernel.org
Cc:	linux-mm@...ck.org, torvalds@...ux-foundation.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: [PATCH 05/43] memblock/arm: pfn_valid uses memblock_is_memory()

The implementation is pretty much similar. There is a -small- added
overhead by having another function call and the address shift.

If that becomes a concern, I suppose we could actually have memblock
itself expose a memblock_pfn_valid() which then ARM can use directly
with an appropriate #define...

Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
---
 arch/arm/mm/init.c |   15 +--------------
 1 files changed, 1 insertions(+), 14 deletions(-)

diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index d1496e6..e739223 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -237,20 +237,7 @@ static void __init arm_bootmem_free(struct meminfo *mi, unsigned long min,
 #ifndef CONFIG_SPARSEMEM
 int pfn_valid(unsigned long pfn)
 {
-	struct memblock_type *mem = &memblock.memory;
-	unsigned int left = 0, right = mem->cnt;
-
-	do {
-		unsigned int mid = (right + left) / 2;
-
-		if (pfn < memblock_start_pfn(mem, mid))
-			right = mid;
-		else if (pfn >= memblock_end_pfn(mem, mid))
-			left = mid + 1;
-		else
-			return 1;
-	} while (left < right);
-	return 0;
+	return memblock_is_memory(pfn << PAGE_SHIFT);
 }
 EXPORT_SYMBOL(pfn_valid);
 
-- 
1.7.0.4

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