x86: convert mm_context_t semaphore to a mutex

[ tglx: arch/x86 adaptation ]

Signed-off-by: Luiz Fernando N. Capitulino <lcapitulino@mandriva.com.br>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 7 insertions, 7 deletions

diff --git a/arch/x86/kernel/ldt_64.c b/arch/x86/kernel/ldt_64.c
index 3796523d616a..60e57abb8e90 100644
--- a/arch/x86/kernel/ldt_64.c
+++ b/arch/x86/kernel/ldt_64.c
@@ -96,13 +96,13 @@ int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
         struct mm_struct * old_mm;
         int retval = 0;
 
-        init_MUTEX(&mm->context.sem);
+        mutex_init(&mm->context.lock);
         mm->context.size = 0;
         old_mm = current->mm;
         if (old_mm && old_mm->context.size > 0) {
-                down(&old_mm->context.sem);
+                mutex_lock(&old_mm->context.lock);
                 retval = copy_ldt(&mm->context, &old_mm->context);
-                up(&old_mm->context.sem);
+                mutex_unlock(&old_mm->context.lock);
         }
         return retval;
 }
@@ -133,7 +133,7 @@ static int read_ldt(void __user * ptr, unsigned long bytecount)
         if (bytecount > LDT_ENTRY_SIZE*LDT_ENTRIES)
                 bytecount = LDT_ENTRY_SIZE*LDT_ENTRIES;
 
-        down(&mm->context.sem);
+        mutex_lock(&mm->context.lock);
         size = mm->context.size*LDT_ENTRY_SIZE;
         if (size > bytecount)
                 size = bytecount;
@@ -141,7 +141,7 @@ static int read_ldt(void __user * ptr, unsigned long bytecount)
         err = 0;
         if (copy_to_user(ptr, mm->context.ldt, size))
                 err = -EFAULT;
-        up(&mm->context.sem);
+        mutex_unlock(&mm->context.lock);
         if (err < 0)
                 goto error_return;
         if (size != bytecount) {
@@ -193,7 +193,7 @@ static int write_ldt(void __user * ptr, unsigned long bytecount, int oldmode)
                         goto out;
         }
 
-        down(&mm->context.sem);
+        mutex_lock(&mm->context.lock);
         if (ldt_info.entry_number >= (unsigned)mm->context.size) {
                 error = alloc_ldt(&current->mm->context, ldt_info.entry_number+1, 1);
                 if (error < 0)
@@ -223,7 +223,7 @@ install:
         error = 0;
 
 out_unlock:
-        up(&mm->context.sem);
+        mutex_unlock(&mm->context.lock);
 out:
         return error;
 }