x86: introduce fill_ldt

This patch introduces fill_ldt(), which populates a ldt descriptor
from a user_desc in once, instead of relying in the LDT_entry_a and
LDT_entry_b macros

Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

3 files changed, 5 insertions, 8 deletions

diff --git a/arch/x86/kernel/ldt.c b/arch/x86/kernel/ldt.c
index 7eb0c8a45734..3e872b468533 100644
--- a/arch/x86/kernel/ldt.c
+++ b/arch/x86/kernel/ldt.c
@@ -223,8 +223,7 @@ static int write_ldt(void __user *ptr, unsigned long bytecount, int oldmode)
                 }
         }
 
-        ldt.a = LDT_entry_a(&ldt_info);
-        ldt.b = LDT_entry_b(&ldt_info);
+        fill_ldt(&ldt, &ldt_info);
         if (oldmode)
                 ldt.avl = 0;
 
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 86c310acc989..f91521e26335 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -457,8 +457,7 @@ static inline void set_32bit_tls(struct task_struct *t, int tls, u32 addr)
         };
         struct desc_struct *desc = (void *)t->thread.tls_array;
         desc += tls;
-        desc->a = LDT_entry_a(&ud);
-        desc->b = LDT_entry_b(&ud);
+        fill_ldt(desc, &ud);
 }
 
 static inline u32 read_32bit_tls(struct task_struct *t, int tls)
diff --git a/arch/x86/kernel/tls.c b/arch/x86/kernel/tls.c
index 67a377621b12..74d2b65a82eb 100644
--- a/arch/x86/kernel/tls.c
+++ b/arch/x86/kernel/tls.c
@@ -67,10 +67,9 @@ int do_set_thread_area(struct task_struct *p, int idx,
         if (LDT_empty(&info)) {
                 desc[0] = 0;
                 desc[1] = 0;
-        } else {
-                desc[0] = LDT_entry_a(&info);
-                desc[1] = LDT_entry_b(&info);
-        }
+        } else
+                fill_ldt((struct desc_struct *)desc, &info);
+
         if (t == &current->thread)
                 load_TLS(t, cpu);