linux-kernel - [PATCH 2/3] mem-hotplug: Put kernel_physical_mapping_remove() declaration in CONFIG_MEMORY

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Date:	Mon, 15 Apr 2013 17:46:46 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	gregkh@...uxfoundation.org, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, yinghai@...nel.org, akpm@...ux-foundation.org,
	wency@...fujitsu.com, mgorman@...e.de, tj@...nel.org,
	liwanp@...ux.vnet.ibm.com
Cc:	tangchen@...fujitsu.com, linux-mm@...ck.org, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] mem-hotplug: Put kernel_physical_mapping_remove() declaration in CONFIG_MEMORY_HOTREMOVE.

kernel_physical_mapping_remove() is only called by arch_remove_memory() in
init_64.c, which is enclosed in CONFIG_MEMORY_HOTREMOVE. So when we don't
configure CONFIG_MEMORY_HOTREMOVE, the compiler will give a warning:

	warning: ‘kernel_physical_mapping_remove’ defined but not used

So put kernel_physical_mapping_remove() in CONFIG_MEMORY_HOTREMOVE.

Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
---
 arch/x86/mm/init_64.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 474e28f..dafdeb2 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -1019,6 +1019,7 @@ void __ref vmemmap_free(struct page *memmap, unsigned long nr_pages)
 	remove_pagetable(start, end, false);
 }
 
+#ifdef CONFIG_MEMORY_HOTREMOVE
 static void __meminit
 kernel_physical_mapping_remove(unsigned long start, unsigned long end)
 {
@@ -1028,7 +1029,6 @@ kernel_physical_mapping_remove(unsigned long start, unsigned long end)
 	remove_pagetable(start, end, true);
 }
 
-#ifdef CONFIG_MEMORY_HOTREMOVE
 int __ref arch_remove_memory(u64 start, u64 size)
 {
 	unsigned long start_pfn = start >> PAGE_SHIFT;
-- 
1.7.1

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