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x86: clean up arch/x86/kernel/ldt_32/64.c

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White space and coding style clenaup.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner 2008-01-30 13:30:13 +01:00 committed by Ingo Molnar
parent 2f36fa13ce
commit 78aa1f66f7
2 changed files with 69 additions and 60 deletions
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60
arch/x86/kernel/ldt_32.c
View File

@ -17,7 +17,7 @@
#include <asm/desc.h> #include <asm/desc.h>
#include <asm/mmu_context.h> #include <asm/mmu_context.h>
#ifdef CONFIG_SMP /* avoids "defined but not used" warnig */ #ifdef CONFIG_SMP
static void flush_ldt(void *null) static void flush_ldt(void *null)
{ {
if (current->active_mm) if (current->active_mm)
@ -34,19 +34,20 @@ static int alloc_ldt(mm_context_t *pc, int mincount, int reload)
if (mincount <= pc->size) if (mincount <= pc->size)
return 0; return 0;
oldsize = pc->size; oldsize = pc->size;
mincount = (mincount+511)&(~511); mincount = (mincount + 511) & (~511);
if (mincount*LDT_ENTRY_SIZE > PAGE_SIZE) if (mincount * LDT_ENTRY_SIZE > PAGE_SIZE)
newldt = vmalloc(mincount*LDT_ENTRY_SIZE); newldt = vmalloc(mincount * LDT_ENTRY_SIZE);
else else
newldt = kmalloc(mincount*LDT_ENTRY_SIZE, GFP_KERNEL); newldt = kmalloc(mincount * LDT_ENTRY_SIZE, GFP_KERNEL);
if (!newldt) if (!newldt)
return -ENOMEM; return -ENOMEM;
if (oldsize) if (oldsize)
memcpy(newldt, pc->ldt, oldsize*LDT_ENTRY_SIZE); memcpy(newldt, pc->ldt, oldsize * LDT_ENTRY_SIZE);
oldldt = pc->ldt; oldldt = pc->ldt;
memset(newldt+oldsize*LDT_ENTRY_SIZE, 0, (mincount-oldsize)*LDT_ENTRY_SIZE); memset(newldt + oldsize * LDT_ENTRY_SIZE, 0,
(mincount - oldsize) * LDT_ENTRY_SIZE);
pc->ldt = newldt; pc->ldt = newldt;
wmb(); wmb();
pc->size = mincount; pc->size = mincount;
@ -55,6 +56,7 @@ static int alloc_ldt(mm_context_t *pc, int mincount, int reload)
if (reload) { if (reload) {
#ifdef CONFIG_SMP #ifdef CONFIG_SMP
cpumask_t mask; cpumask_t mask;
preempt_disable(); preempt_disable();
load_LDT(pc); load_LDT(pc);
mask = cpumask_of_cpu(smp_processor_id()); mask = cpumask_of_cpu(smp_processor_id());
@ -66,7 +68,7 @@ static int alloc_ldt(mm_context_t *pc, int mincount, int reload)
#endif #endif
} }
if (oldsize) { if (oldsize) {
if (oldsize*LDT_ENTRY_SIZE > PAGE_SIZE) if (oldsize * LDT_ENTRY_SIZE > PAGE_SIZE)
vfree(oldldt); vfree(oldldt);
else else
kfree(oldldt); kfree(oldldt);
@ -77,9 +79,10 @@ static int alloc_ldt(mm_context_t *pc, int mincount, int reload)
static inline int copy_ldt(mm_context_t *new, mm_context_t *old) static inline int copy_ldt(mm_context_t *new, mm_context_t *old)
{ {
int err = alloc_ldt(new, old->size, 0); int err = alloc_ldt(new, old->size, 0);
if (err < 0) if (err < 0)
return err; return err;
memcpy(new->ldt, old->ldt, old->size*LDT_ENTRY_SIZE); memcpy(new->ldt, old->ldt, old->size * LDT_ENTRY_SIZE);
return 0; return 0;
} }
@ -89,7 +92,7 @@ static inline int copy_ldt(mm_context_t *new, mm_context_t *old)
*/ */
int init_new_context(struct task_struct *tsk, struct mm_struct *mm) int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{ {
struct mm_struct * old_mm; struct mm_struct *old_mm;
int retval = 0; int retval = 0;
mutex_init(&mm->context.lock); mutex_init(&mm->context.lock);
@ -111,7 +114,7 @@ void destroy_context(struct mm_struct *mm)
if (mm->context.size) { if (mm->context.size) {
if (mm == current->active_mm) if (mm == current->active_mm)
clear_LDT(); clear_LDT();
if (mm->context.size*LDT_ENTRY_SIZE > PAGE_SIZE) if (mm->context.size * LDT_ENTRY_SIZE > PAGE_SIZE)
vfree(mm->context.ldt); vfree(mm->context.ldt);
else else
kfree(mm->context.ldt); kfree(mm->context.ldt);
@ -119,19 +122,19 @@ void destroy_context(struct mm_struct *mm)
} }
} }
static int read_ldt(void __user * ptr, unsigned long bytecount) static int read_ldt(void __user *ptr, unsigned long bytecount)
{ {
int err; int err;
unsigned long size; unsigned long size;
struct mm_struct * mm = current->mm; struct mm_struct *mm = current->mm;
if (!mm->context.size) if (!mm->context.size)
return 0; return 0;
if (bytecount > LDT_ENTRY_SIZE*LDT_ENTRIES) if (bytecount > LDT_ENTRY_SIZE * LDT_ENTRIES)
bytecount = LDT_ENTRY_SIZE*LDT_ENTRIES; bytecount = LDT_ENTRY_SIZE * LDT_ENTRIES;
mutex_lock(&mm->context.lock); mutex_lock(&mm->context.lock);
size = mm->context.size*LDT_ENTRY_SIZE; size = mm->context.size * LDT_ENTRY_SIZE;
if (size > bytecount) if (size > bytecount)
size = bytecount; size = bytecount;
@ -143,7 +146,7 @@ static int read_ldt(void __user * ptr, unsigned long bytecount)
goto error_return; goto error_return;
if (size != bytecount) { if (size != bytecount) {
/* zero-fill the rest */ /* zero-fill the rest */
if (clear_user(ptr+size, bytecount-size) != 0) { if (clear_user(ptr + size, bytecount - size) != 0) {
err = -EFAULT; err = -EFAULT;
goto error_return; goto error_return;
} }
@ -153,13 +156,13 @@ static int read_ldt(void __user * ptr, unsigned long bytecount)
return err; return err;
} }
static int read_default_ldt(void __user * ptr, unsigned long bytecount) static int read_default_ldt(void __user *ptr, unsigned long bytecount)
{ {
int err; int err;
unsigned long size; unsigned long size;
err = 0; err = 0;
size = 5*sizeof(struct desc_struct); size = 5 * sizeof(struct desc_struct);
if (size > bytecount) if (size > bytecount)
size = bytecount; size = bytecount;
@ -170,9 +173,9 @@ static int read_default_ldt(void __user * ptr, unsigned long bytecount)
return err; return err;
} }
static int write_ldt(void __user * ptr, unsigned long bytecount, int oldmode) static int write_ldt(void __user *ptr, unsigned long bytecount, int oldmode)
{ {
struct mm_struct * mm = current->mm; struct mm_struct *mm = current->mm;
__u32 entry_1, entry_2; __u32 entry_1, entry_2;
int error; int error;
struct user_desc ldt_info; struct user_desc ldt_info;
@ -180,7 +183,7 @@ static int write_ldt(void __user * ptr, unsigned long bytecount, int oldmode)
error = -EINVAL; error = -EINVAL;
if (bytecount != sizeof(ldt_info)) if (bytecount != sizeof(ldt_info))
goto out; goto out;
error = -EFAULT; error = -EFAULT;
if (copy_from_user(&ldt_info, ptr, sizeof(ldt_info))) if (copy_from_user(&ldt_info, ptr, sizeof(ldt_info)))
goto out; goto out;
@ -196,13 +199,14 @@ static int write_ldt(void __user * ptr, unsigned long bytecount, int oldmode)
mutex_lock(&mm->context.lock); mutex_lock(&mm->context.lock);
if (ldt_info.entry_number >= mm->context.size) { if (ldt_info.entry_number >= mm->context.size) {
error = alloc_ldt(&current->mm->context, ldt_info.entry_number+1, 1); error = alloc_ldt(&current->mm->context,
ldt_info.entry_number + 1, 1);
if (error < 0) if (error < 0)
goto out_unlock; goto out_unlock;
} }
/* Allow LDTs to be cleared by the user. */ /* Allow LDTs to be cleared by the user. */
if (ldt_info.base_addr == 0 && ldt_info.limit == 0) { if (ldt_info.base_addr == 0 && ldt_info.limit == 0) {
if (oldmode || LDT_empty(&ldt_info)) { if (oldmode || LDT_empty(&ldt_info)) {
entry_1 = 0; entry_1 = 0;
entry_2 = 0; entry_2 = 0;
@ -217,7 +221,8 @@ static int write_ldt(void __user * ptr, unsigned long bytecount, int oldmode)
/* Install the new entry ... */ /* Install the new entry ... */
install: install:
write_ldt_entry(mm->context.ldt, ldt_info.entry_number, entry_1, entry_2); write_ldt_entry(mm->context.ldt, ldt_info.entry_number, entry_1,
entry_2);
error = 0; error = 0;
out_unlock: out_unlock:
@ -226,7 +231,8 @@ static int write_ldt(void __user * ptr, unsigned long bytecount, int oldmode)
return error; return error;
} }
asmlinkage int sys_modify_ldt(int func, void __user *ptr, unsigned long bytecount) asmlinkage int sys_modify_ldt(int func, void __user *ptr,
unsigned long bytecount)
{ {
int ret = -ENOSYS; int ret = -ENOSYS;

69
arch/x86/kernel/ldt_64.c
View File

@ -2,7 +2,7 @@
* Copyright (C) 1992 Krishna Balasubramanian and Linus Torvalds * Copyright (C) 1992 Krishna Balasubramanian and Linus Torvalds
* Copyright (C) 1999 Ingo Molnar <mingo@redhat.com> * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com>
* Copyright (C) 2002 Andi Kleen * Copyright (C) 2002 Andi Kleen
* *
* This handles calls from both 32bit and 64bit mode. * This handles calls from both 32bit and 64bit mode.
*/ */
@ -20,11 +20,11 @@
#include <asm/desc.h> #include <asm/desc.h>
#include <asm/proto.h> #include <asm/proto.h>
#ifdef CONFIG_SMP /* avoids "defined but not used" warnig */ #ifdef CONFIG_SMP
static void flush_ldt(void *null) static void flush_ldt(void *null)
{ {
if (current->active_mm) if (current->active_mm)
load_LDT(&current->active_mm->context); load_LDT(&current->active_mm->context);
} }
#endif #endif
@ -37,19 +37,20 @@ static int alloc_ldt(mm_context_t *pc, unsigned mincount, int reload)
if (mincount <= (unsigned)pc->size) if (mincount <= (unsigned)pc->size)
return 0; return 0;
oldsize = pc->size; oldsize = pc->size;
mincount = (mincount+511)&(~511); mincount = (mincount + 511) & (~511);
if (mincount*LDT_ENTRY_SIZE > PAGE_SIZE) if (mincount * LDT_ENTRY_SIZE > PAGE_SIZE)
newldt = vmalloc(mincount*LDT_ENTRY_SIZE); newldt = vmalloc(mincount * LDT_ENTRY_SIZE);
else else
newldt = kmalloc(mincount*LDT_ENTRY_SIZE, GFP_KERNEL); newldt = kmalloc(mincount * LDT_ENTRY_SIZE, GFP_KERNEL);
if (!newldt) if (!newldt)
return -ENOMEM; return -ENOMEM;
if (oldsize) if (oldsize)
memcpy(newldt, pc->ldt, oldsize*LDT_ENTRY_SIZE); memcpy(newldt, pc->ldt, oldsize * LDT_ENTRY_SIZE);
oldldt = pc->ldt; oldldt = pc->ldt;
memset(newldt+oldsize*LDT_ENTRY_SIZE, 0, (mincount-oldsize)*LDT_ENTRY_SIZE); memset(newldt + oldsize * LDT_ENTRY_SIZE, 0,
(mincount - oldsize) * LDT_ENTRY_SIZE);
wmb(); wmb();
pc->ldt = newldt; pc->ldt = newldt;
wmb(); wmb();
@ -70,7 +71,7 @@ static int alloc_ldt(mm_context_t *pc, unsigned mincount, int reload)
#endif #endif
} }
if (oldsize) { if (oldsize) {
if (oldsize*LDT_ENTRY_SIZE > PAGE_SIZE) if (oldsize * LDT_ENTRY_SIZE > PAGE_SIZE)
vfree(oldldt); vfree(oldldt);
else else
kfree(oldldt); kfree(oldldt);
@ -81,9 +82,10 @@ static int alloc_ldt(mm_context_t *pc, unsigned mincount, int reload)
static inline int copy_ldt(mm_context_t *new, mm_context_t *old) static inline int copy_ldt(mm_context_t *new, mm_context_t *old)
{ {
int err = alloc_ldt(new, old->size, 0); int err = alloc_ldt(new, old->size, 0);
if (err < 0) if (err < 0)
return err; return err;
memcpy(new->ldt, old->ldt, old->size*LDT_ENTRY_SIZE); memcpy(new->ldt, old->ldt, old->size * LDT_ENTRY_SIZE);
return 0; return 0;
} }
@ -93,7 +95,7 @@ static inline int copy_ldt(mm_context_t *new, mm_context_t *old)
*/ */
int init_new_context(struct task_struct *tsk, struct mm_struct *mm) int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{ {
struct mm_struct * old_mm; struct mm_struct *old_mm;
int retval = 0; int retval = 0;
mutex_init(&mm->context.lock); mutex_init(&mm->context.lock);
@ -108,13 +110,12 @@ int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
} }
/* /*
*
* Don't touch the LDT register - we're already in the next thread. * Don't touch the LDT register - we're already in the next thread.
*/ */
void destroy_context(struct mm_struct *mm) void destroy_context(struct mm_struct *mm)
{ {
if (mm->context.size) { if (mm->context.size) {
if ((unsigned)mm->context.size*LDT_ENTRY_SIZE > PAGE_SIZE) if ((unsigned)mm->context.size * LDT_ENTRY_SIZE > PAGE_SIZE)
vfree(mm->context.ldt); vfree(mm->context.ldt);
else else
kfree(mm->context.ldt); kfree(mm->context.ldt);
@ -122,19 +123,19 @@ void destroy_context(struct mm_struct *mm)
} }
} }
static int read_ldt(void __user * ptr, unsigned long bytecount) static int read_ldt(void __user *ptr, unsigned long bytecount)
{ {
int err; int err;
unsigned long size; unsigned long size;
struct mm_struct * mm = current->mm; struct mm_struct *mm = current->mm;
if (!mm->context.size) if (!mm->context.size)
return 0; return 0;
if (bytecount > LDT_ENTRY_SIZE*LDT_ENTRIES) if (bytecount > LDT_ENTRY_SIZE * LDT_ENTRIES)
bytecount = LDT_ENTRY_SIZE*LDT_ENTRIES; bytecount = LDT_ENTRY_SIZE * LDT_ENTRIES;
mutex_lock(&mm->context.lock); mutex_lock(&mm->context.lock);
size = mm->context.size*LDT_ENTRY_SIZE; size = mm->context.size * LDT_ENTRY_SIZE;
if (size > bytecount) if (size > bytecount)
size = bytecount; size = bytecount;
@ -146,7 +147,7 @@ static int read_ldt(void __user * ptr, unsigned long bytecount)
goto error_return; goto error_return;
if (size != bytecount) { if (size != bytecount) {
/* zero-fill the rest */ /* zero-fill the rest */
if (clear_user(ptr+size, bytecount-size) != 0) { if (clear_user(ptr + size, bytecount - size) != 0) {
err = -EFAULT; err = -EFAULT;
goto error_return; goto error_return;
} }
@ -156,21 +157,21 @@ static int read_ldt(void __user * ptr, unsigned long bytecount)
return err; return err;
} }
static int read_default_ldt(void __user * ptr, unsigned long bytecount) static int read_default_ldt(void __user *ptr, unsigned long bytecount)
{ {
/* Arbitrary number */ /* Arbitrary number */
/* x86-64 default LDT is all zeros */ /* x86-64 default LDT is all zeros */
if (bytecount > 128) if (bytecount > 128)
bytecount = 128; bytecount = 128;
if (clear_user(ptr, bytecount)) if (clear_user(ptr, bytecount))
return -EFAULT; return -EFAULT;
return bytecount; return bytecount;
} }
static int write_ldt(void __user * ptr, unsigned long bytecount, int oldmode) static int write_ldt(void __user *ptr, unsigned long bytecount, int oldmode)
{ {
struct task_struct *me = current; struct task_struct *me = current;
struct mm_struct * mm = me->mm; struct mm_struct *mm = me->mm;
__u32 entry_1, entry_2, *lp; __u32 entry_1, entry_2, *lp;
int error; int error;
struct user_desc ldt_info; struct user_desc ldt_info;
@ -179,7 +180,7 @@ static int write_ldt(void __user * ptr, unsigned long bytecount, int oldmode)
if (bytecount != sizeof(ldt_info)) if (bytecount != sizeof(ldt_info))
goto out; goto out;
error = -EFAULT; error = -EFAULT;
if (copy_from_user(&ldt_info, ptr, bytecount)) if (copy_from_user(&ldt_info, ptr, bytecount))
goto out; goto out;
@ -195,15 +196,16 @@ static int write_ldt(void __user * ptr, unsigned long bytecount, int oldmode)
mutex_lock(&mm->context.lock); mutex_lock(&mm->context.lock);
if (ldt_info.entry_number >= (unsigned)mm->context.size) { if (ldt_info.entry_number >= (unsigned)mm->context.size) {
error = alloc_ldt(&current->mm->context, ldt_info.entry_number+1, 1); error = alloc_ldt(&current->mm->context,
ldt_info.entry_number + 1, 1);
if (error < 0) if (error < 0)
goto out_unlock; goto out_unlock;
} }
lp = (__u32 *) ((ldt_info.entry_number << 3) + (char *) mm->context.ldt); lp = (__u32 *)((ldt_info.entry_number << 3) + (char *)mm->context.ldt);
/* Allow LDTs to be cleared by the user. */ /* Allow LDTs to be cleared by the user. */
if (ldt_info.base_addr == 0 && ldt_info.limit == 0) { if (ldt_info.base_addr == 0 && ldt_info.limit == 0) {
if (oldmode || LDT_empty(&ldt_info)) { if (oldmode || LDT_empty(&ldt_info)) {
entry_1 = 0; entry_1 = 0;
entry_2 = 0; entry_2 = 0;
@ -228,7 +230,8 @@ static int write_ldt(void __user * ptr, unsigned long bytecount, int oldmode)
return error; return error;
} }
asmlinkage int sys_modify_ldt(int func, void __user *ptr, unsigned long bytecount) asmlinkage int sys_modify_ldt(int func, void __user *ptr,
unsigned long bytecount)
{ {
int ret = -ENOSYS; int ret = -ENOSYS;