x86: acpi: Prevent acpi_table.h from being included more than once

The wrapper #ifndef is currently missing in acpi_table.h. Add it to
prevent it from being included multiple times.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/arch/x86/include/asm/acpi_table.h b/arch/x86/include/asm/acpi_table.h
index dd516df97f45345cdd9cbd1bed9e4b02ddcc3137..95fae036f69f563238958dca1b99df84eda9eca4 100644 (file)
--- a/arch/x86/include/asm/acpi_table.h
+++ b/arch/x86/include/asm/acpi_table.h
@@ -6,6 +6,9 @@
  * Copyright (C) 2016, Bin Meng <bmeng.cn@gmail.com>
  */
 
+#ifndef __ASM_ACPI_TABLE_H__
+#define __ASM_ACPI_TABLE_H__
+
 #define RSDP_SIG               "RSD PTR "      /* RSDP pointer signature */
 #define OEM_ID                 "U-BOOT"        /* U-Boot */
 #define OEM_TABLE_ID           "U-BOOTBL"      /* U-Boot Table */
@@ -327,3 +330,5 @@ ulong write_acpi_tables(ulong start);
  * @return:    ACPI RSDP table address
  */
 ulong acpi_get_rsdp_addr(void);
+
+#endif /* __ASM_ACPI_TABLE_H__ */