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From:   Yi Wang <wang.yi59@zte.com.cn>
To:     tglx@linutronix.de
Cc:     mingo@redhat.com, bp@alien8.de, hpa@zytor.com, x86@kernel.org,
        akpm@linux-foundation.org, rppt@linux.vnet.ibm.com,
        mhocko@suse.com, pavel.tatashin@microsoft.com, joe@perches.com,
        jschoenh@amazon.de, m.mizuma@jp.fujitsu.com,
        n-horiguchi@ah.jp.nec.com, linux-kernel@vger.kernel.org,
        xue.zhihong@zte.com.cn, wang.yi59@zte.com.cn,
        "huang.zijiang" <huang.zijiang@zte.com.cn>
Subject: [PATCH] x86:kernel:e820c:kmemdup instead of duplicating its function
Date:   Tue, 8 Jan 2019 13:42:17 +0800
Message-Id: <1546926137-32136-1-git-send-email-wang.yi59@zte.com.cn>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

From: "huang.zijiang" <huang.zijiang@zte.com.cn>

kmemdup has implemented the function that kmalloc() and memcpy().

Signed-off-by: huang.zijiang <huang.zijiang@zte.com.cn>
---
 arch/x86/kernel/e820.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 50895c2..a687d10 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -671,21 +671,18 @@ __init void e820__reallocate_tables(void)
 	int size;
 
 	size = offsetof(struct e820_table, entries) + sizeof(struct e820_entry)*e820_table->nr_entries;
-	n = kmalloc(size, GFP_KERNEL);
+	n = kmemdup(e820_table, size, GFP_KERNEL);
 	BUG_ON(!n);
-	memcpy(n, e820_table, size);
 	e820_table = n;
 
 	size = offsetof(struct e820_table, entries) + sizeof(struct e820_entry)*e820_table_kexec->nr_entries;
-	n = kmalloc(size, GFP_KERNEL);
+	n = kmemdup(e820_table_kexec, size, GFP_KERNEL);
 	BUG_ON(!n);
-	memcpy(n, e820_table_kexec, size);
 	e820_table_kexec = n;
 
 	size = offsetof(struct e820_table, entries) + sizeof(struct e820_entry)*e820_table_firmware->nr_entries;
-	n = kmalloc(size, GFP_KERNEL);
+	n = kmemdup(e820_table_firmware, size, GFP_KERNEL);
 	BUG_ON(!n);
-	memcpy(n, e820_table_firmware, size);
 	e820_table_firmware = n;
 }
 
-- 
1.8.3.1