x86: introduce ldt_write accessor

Create a ldt write accessor like the 32 bit one.

Preparatory patch for merging ldt.c and anyway necessary for
64bit paravirt ops.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 3 insertions, 5 deletions

diff --git a/arch/x86/kernel/ldt_64.c b/arch/x86/kernel/ldt_64.c
index 6c41db367de8..d72dc7a0636f 100644
--- a/arch/x86/kernel/ldt_64.c
+++ b/arch/x86/kernel/ldt_64.c
@@ -172,7 +172,7 @@ static int write_ldt(void __user *ptr, unsigned long bytecount, int oldmode)
 {
         struct task_struct *me = current;
         struct mm_struct *mm = me->mm;
-        __u32 entry_1, entry_2, *lp;
+        __u32 entry_1, entry_2;
         int error;
         struct user_desc ldt_info;
 
@@ -202,8 +202,6 @@ static int write_ldt(void __user *ptr, unsigned long bytecount, int oldmode)
                         goto out_unlock;
         }
 
-        lp = (__u32 *)((ldt_info.entry_number << 3) + (char *)mm->context.ldt);
-
         /* Allow LDTs to be cleared by the user. */
         if (ldt_info.base_addr == 0 && ldt_info.limit == 0) {
                 if (oldmode || LDT_empty(&ldt_info)) {
@@ -220,8 +218,8 @@ static int write_ldt(void __user *ptr, unsigned long bytecount, int oldmode)
 
         /* Install the new entry ...  */
 install:
-        *lp     = entry_1;
-        *(lp+1) = entry_2;
+        write_ldt_entry(mm->context.ldt, ldt_info.entry_number, entry_1,
+                        entry_2);
         error = 0;
 
 out_unlock: