linux-kernel - [PATCH V3 1/2] mm/memblock.c: trivial code refine in memblock_is_region

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Date:   Wed, 21 Dec 2016 23:30:32 +0000
From:   Wei Yang <richard.weiyang@...il.com>
To:     trivial@...nel.org, akpm@...ux-foundation.org, mhocko@...nel.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Wei Yang <richard.weiyang@...il.com>
Subject: [PATCH V3 1/2] mm/memblock.c: trivial code refine in memblock_is_region_memory()

memblock_is_region_memory() invoke memblock_search() to see whether the
base address is in the memory region. If it fails, idx would be -1. Then,
it returns 0.

If the memblock_search() returns a valid index, it means the base address
is guaranteed to be in the range memblock.memory.regions[idx]. Because of
this, it is not necessary to check the base again.

This patch removes the check on "base".

Signed-off-by: Wei Yang <richard.weiyang@...il.com>
---
 mm/memblock.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/memblock.c b/mm/memblock.c
index 7608bc3..4929e06 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -1615,8 +1615,7 @@ int __init_memblock memblock_is_region_memory(phys_addr_t base, phys_addr_t size
 
 	if (idx == -1)
 		return 0;
-	return memblock.memory.regions[idx].base <= base &&
-		(memblock.memory.regions[idx].base +
+	return (memblock.memory.regions[idx].base +
 		 memblock.memory.regions[idx].size) >= end;
 }
 
-- 
2.5.0