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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>
This commit is contained in:
Luiz Fernando N. Capitulino 2007-10-17 18:04:41 +02:00 committed by Thomas Gleixner
parent 99741faa34
commit c7537ab234
3 changed files with 11 additions and 11 deletions
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14
arch/x86/kernel/ldt_64.c
View File

@ -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;
}

4
arch/x86/kernel/ptrace_64.c
View File

@ -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;

4
include/asm-x86/mmu_64.h
View File

@ -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;