x86: convert mm_context_t semaphore to a mutex

convert mm_context_t semaphore to a mutex.

Signed-off-by: Luiz Fernando N. Capitulino <lcapitulino@mandriva.com.br>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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 32c464f5d9
commit de8aacbe6a
5 changed files with 14 additions and 13 deletions

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@ -1,4 +1,5 @@
#include <linux/module.h>
#include <asm/semaphore.h>
#include <asm/checksum.h>
#include <asm/desc.h>

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@ -92,13 +92,13 @@ 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;
}
@ -130,7 +130,7 @@ 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;
@ -138,7 +138,7 @@ 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) {
@ -194,7 +194,7 @@ 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 >= mm->context.size) {
error = alloc_ldt(&current->mm->context, ldt_info.entry_number+1, 1);
if (error < 0)
@ -221,7 +221,7 @@ install:
error = 0;
out_unlock:
up(&mm->context.sem);
mutex_unlock(&mm->context.lock);
out:
return error;
}

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@ -165,7 +165,7 @@ static unsigned long convert_eip_to_linear(struct task_struct *child, struct pt_
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 {
@ -179,7 +179,7 @@ static unsigned long convert_eip_to_linear(struct task_struct *child, struct pt_
addr &= 0xffff;
addr += base;
}
up(&child->mm->context.sem);
mutex_unlock(&child->mm->context.lock);
}
return addr;
}

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@ -105,7 +105,7 @@ static inline unsigned long get_segment_eip(struct pt_regs *regs,
LDT and other horrors are only used in user space. */
if (seg & (1<<2)) {
/* Must lock the LDT while reading it. */
down(&current->mm->context.sem);
mutex_lock(&current->mm->context.lock);
desc = current->mm->context.ldt;
desc = (void *)desc + (seg & ~7);
} else {
@ -118,7 +118,7 @@ static inline unsigned long get_segment_eip(struct pt_regs *regs,
base = get_desc_base((unsigned long *)desc);
if (seg & (1<<2)) {
up(&current->mm->context.sem);
mutex_unlock(&current->mm->context.lock);
} else
put_cpu();

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@ -1,7 +1,7 @@
#ifndef __i386_MMU_H
#define __i386_MMU_H
#include <asm/semaphore.h>
#include <linux/mutex.h>
/*
* The i386 doesn't have a mmu context, but
* we put the segment information here.
@ -10,7 +10,7 @@
*/
typedef struct {
int size;
struct semaphore sem;
struct mutex lock;
void *ldt;
void *vdso;
} mm_context_t;