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>

diff --git a/arch/x86/kernel/ldt_64.c b/arch/x86/kernel/ldt_64.c
index 3796523..60e57ab 100644 (file)
--- 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;
 }

diff --git a/arch/x86/kernel/ptrace_64.c b/arch/x86/kernel/ptrace_64.c
index 86321ee..607085f 100644 (file)
--- a/arch/x86/kernel/ptrace_64.c
+++ b/arch/x86/kernel/ptrace_64.c
@@ -103,7 +103,7 @@ unsigned long convert_rip_to_linear(struct task_struct *child, struct pt_regs *r
 
                seg &= ~7UL;
 
-               down(&child->mm->context.sem);
+               mutex_lock(&child->mm->context.lock);
                if (unlikely((seg >> 3) >= child->mm->context.size))
                        addr = -1L; /* bogus selector, access would fault */
                else {
@@ -117,7 +117,7 @@ unsigned long convert_rip_to_linear(struct task_struct *child, struct pt_regs *r
                                addr &= 0xffff;
                        addr += base;
                }
-               up(&child->mm->context.sem);
+               mutex_unlock(&child->mm->context.lock);
        }
 
        return addr;

diff --git a/include/asm-x86/mmu_64.h b/include/asm-x86/mmu_64.h
index d2cd4a9..024357c 100644 (file)
--- a/include/asm-x86/mmu_64.h
+++ b/include/asm-x86/mmu_64.h
@@ -2,7 +2,7 @@
 #define __x86_64_MMU_H
 
 #include <linux/spinlock.h>
-#include <asm/semaphore.h>
+#include <linux/mutex.h>
 
 /*
  * The x86_64 doesn't have a mmu context, but
@@ -14,7 +14,7 @@ typedef struct {
        void *ldt;
        rwlock_t ldtlock; 
        int size;
-       struct semaphore sem; 
+       struct mutex lock;
        void *vdso;
 } mm_context_t;