1 files changed, 8 insertions, 4 deletions

diff --git a/include/asm-um/ldt-x86_64.h b/include/asm-um/ldt-x86_64.h
index 175722a9116..96b35aada79 100644
--- a/include/asm-um/ldt-x86_64.h
+++ b/include/asm-um/ldt-x86_64.h
@@ -5,8 +5,8 @@
  * Author: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
  */
 
-#ifndef __ASM_LDT_I386_H
-#define __ASM_LDT_I386_H
+#ifndef __ASM_LDT_X86_64_H
+#define __ASM_LDT_X86_64_H
 
 #include "asm/semaphore.h"
 #include "asm/arch/ldt.h"
@@ -39,11 +39,13 @@ typedef struct uml_ldt {
 } uml_ldt_t;
 
 /*
- * macros stolen from include/asm-i386/desc.h
+ * macros stolen from include/asm-x86_64/desc.h
  */
 #define LDT_entry_a(info) \
         ((((info)->base_addr & 0x0000ffff) << 16) | ((info)->limit & 0x0ffff))
 
+/* Don't allow setting of the lm bit. It is useless anyways because
+ * 64bit system calls require __USER_CS. */
 #define LDT_entry_b(info) \
         (((info)->base_addr & 0xff000000) | \
         (((info)->base_addr & 0x00ff0000) >> 16) | \
@@ -54,6 +56,7 @@ typedef struct uml_ldt {
         ((info)->seg_32bit << 22) | \
         ((info)->limit_in_pages << 23) | \
         ((info)->useable << 20) | \
+        /* ((info)->lm << 21) | */ \
         0x7000)
 
 #define LDT_empty(info) (\
@@ -64,6 +67,7 @@ typedef struct uml_ldt {
         (info)->seg_32bit       == 0    && \
         (info)->limit_in_pages  == 0    && \
         (info)->seg_not_present == 1    && \
-        (info)->useable         == 0    )
+        (info)->useable         == 0    && \
+        (info)->lm              == 0)
 
 #endif