linux-kernel - [PATCH 1/3] x86: reserve_crashkernel: use memblock_is_region

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Message-ID: <20130415080621.GA1994@udknight>
Date:	Mon, 15 Apr 2013 16:06:21 +0800
From:	Wang YanQing <udknight@...il.com>
To:	akpm@...ux-foundation.org
Cc:	yinghai@...nel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] x86: reserve_crashkernel: use
 memblock_is_region_reserved to simplify code

Use memblock_is_region_reserved instead of memblock_find_in_range
to simplify the check codes, and gain a little speed benefit.

Signed-off-by: Wang YanQing <udknight@...il.com>
---
 arch/x86/kernel/setup.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 90d8cc9..9d60c85 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -577,11 +577,7 @@ static void __init reserve_crashkernel(void)
 		}
 
 	} else {
-		unsigned long long start;
-
-		start = memblock_find_in_range(crash_base,
-				 crash_base + crash_size, crash_size, 1<<20);
-		if (start != crash_base) {
+		if (memblock_is_region_reserved(crash_base, crash_size)) {
 			pr_info("crashkernel reservation failed - memory is in use.\n");
 			return;
 		}
-- 
1.7.12.4.dirty
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