x86/e820: Replace kmalloc() + memcpy() with kmemdup()

Use the equivalent kmemdup() directly instead of kmalloc() + memcpy().

No functional changes.

 [ bp: rewrite commit message. ]

Signed-off-by: Huang Zijiang <huang.zijiang@zte.com.cn>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Joe Perches <joe@perches.com>
Cc: jschoenh@amazon.de
Cc: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86-ml <x86@kernel.org>
Cc: xue.zhihong@zte.com.cn
Link: https://lkml.kernel.org/r/1547277384-22156-1-git-send-email-wang.yi59@zte.com.cn

diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 50895c2f937d144f9fd2b133c0522aadc7841c9e..a687d10da4178737afcb09b5dd24f6fea3430057 100644 (file)
--- 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;
 }