linux-kernel - [PATCH 1/2] memblock: Make memblock_overlaps

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Date:	Fri, 17 Jul 2015 09:23:30 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	<tglx@...utronix.de>, <mingo@...hat.com>, <hpa@...or.com>,
	<akpm@...ux-foundation.org>, <tj@...nel.org>, <dyoung@...hat.com>,
	<isimatu.yasuaki@...fujitsu.com>, <yasu.isimatu@...il.com>,
	<lcapitulino@...hat.com>, <qiuxishi@...wei.com>,
	<will.deacon@....com>, <tony.luck@...el.com>,
	<vladimir.murzin@....com>, <fabf@...net.be>,
	<kuleshovmail@...il.com>, <bhe@...hat.com>
CC:	<x86@...nel.org>, <tangchen@...fujitsu.com>,
	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>
Subject: [PATCH 1/2] memblock: Make memblock_overlaps_region() return bool.

memblock_overlaps_region() checks if the given memblock region
intersects a region in memblock. If so, it returns the index of
the intersected region.

But its only caller is memblock_is_region_reserved(), and it
returns 0 if false, non-zero if true.

Both of these should return bool.

Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
---
 include/linux/memblock.h |  2 +-
 mm/memblock.c            | 10 +++++-----
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index cc4b019..d312ae3 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -323,7 +323,7 @@ void memblock_enforce_memory_limit(phys_addr_t memory_limit);
 int memblock_is_memory(phys_addr_t addr);
 int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
 int memblock_is_reserved(phys_addr_t addr);
-int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
+bool memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
 
 extern void __memblock_dump_all(void);
 
diff --git a/mm/memblock.c b/mm/memblock.c
index 87108e7..f1e7100 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -91,7 +91,7 @@ static unsigned long __init_memblock memblock_addrs_overlap(phys_addr_t base1, p
 	return ((base1 < (base2 + size2)) && (base2 < (base1 + size1)));
 }
 
-static long __init_memblock memblock_overlaps_region(struct memblock_type *type,
+static bool __init_memblock memblock_overlaps_region(struct memblock_type *type,
 					phys_addr_t base, phys_addr_t size)
 {
 	unsigned long i;
@@ -103,7 +103,7 @@ static long __init_memblock memblock_overlaps_region(struct memblock_type *type,
 			break;
 	}
 
-	return (i < type->cnt) ? i : -1;
+	return i < type->cnt;
 }
 
 /*
@@ -1562,12 +1562,12 @@ int __init_memblock memblock_is_region_memory(phys_addr_t base, phys_addr_t size
  * Check if the region [@base, @base+@...e) intersects a reserved memory block.
  *
  * RETURNS:
- * 0 if false, non-zero if true
+ * True if they intersect, false if not.
  */
-int __init_memblock memblock_is_region_reserved(phys_addr_t base, phys_addr_t size)
+bool __init_memblock memblock_is_region_reserved(phys_addr_t base, phys_addr_t size)
 {
 	memblock_cap_size(base, &size);
-	return memblock_overlaps_region(&memblock.reserved, base, size) >= 0;
+	return memblock_overlaps_region(&memblock.reserved, base, size);
 }
 
 void __init_memblock memblock_trim_memory(phys_addr_t align)
-- 
1.8.3.1

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