Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=efd1ca52d04d2f6df337a3332cee56cd60e6d4c4
Commit:     efd1ca52d04d2f6df337a3332cee56cd60e6d4c4
Parent:     13abd0e50433092c41551bc13c32268028b6d663
Author:     Roland McGrath <[EMAIL PROTECTED]>
AuthorDate: Wed Jan 30 13:30:46 2008 +0100
Committer:  Ingo Molnar <[EMAIL PROTECTED]>
CommitDate: Wed Jan 30 13:30:46 2008 +0100

    x86: TLS cleanup
    
    This consolidates the four different places that implemented the same
    encoding magic for the GDT-slot 32-bit TLS support.  The old tls32.c was
    renamed and is now only slightly modified to be the shared implementation.
    
    Signed-off-by: Roland McGrath <[EMAIL PROTECTED]>
    Cc: Andrew Morton <[EMAIL PROTECTED]>
    Cc: Zachary Amsden <[EMAIL PROTECTED]>
    Signed-off-by: Thomas Gleixner <[EMAIL PROTECTED]>
    Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
    Signed-off-by: Thomas Gleixner <[EMAIL PROTECTED]>
---
 arch/x86/ia32/ia32entry.S    |    4 +-
 arch/x86/kernel/Makefile_32  |    1 +
 arch/x86/kernel/process_32.c |  141 ++----------------------------------------
 arch/x86/kernel/process_64.c |    3 +-
 arch/x86/kernel/ptrace_32.c  |   91 +++-------------------------
 arch/x86/kernel/ptrace_64.c  |   26 +++-----
 arch/x86/kernel/tls.c        |   96 +++++++++++-----------------
 include/asm-x86/ia32.h       |    6 --
 include/asm-x86/ptrace.h     |   11 +++
 9 files changed, 77 insertions(+), 302 deletions(-)

diff --git a/arch/x86/ia32/ia32entry.S b/arch/x86/ia32/ia32entry.S
index 2499a32..0db0a62 100644
--- a/arch/x86/ia32/ia32entry.S
+++ b/arch/x86/ia32/ia32entry.S
@@ -643,8 +643,8 @@ ia32_sys_call_table:
        .quad compat_sys_futex          /* 240 */
        .quad compat_sys_sched_setaffinity
        .quad compat_sys_sched_getaffinity
-       .quad sys32_set_thread_area
-       .quad sys32_get_thread_area
+       .quad sys_set_thread_area
+       .quad sys_get_thread_area
        .quad compat_sys_io_setup       /* 245 */
        .quad sys_io_destroy
        .quad compat_sys_io_getevents
diff --git a/arch/x86/kernel/Makefile_32 b/arch/x86/kernel/Makefile_32
index 2c9596b..9a6577a 100644
--- a/arch/x86/kernel/Makefile_32
+++ b/arch/x86/kernel/Makefile_32
@@ -10,6 +10,7 @@ obj-y := process_32.o signal_32.o entry_32.o traps_32.o 
irq_32.o \
                pci-dma_32.o i386_ksyms_32.o i387_32.o bootflag.o e820_32.o\
                quirks.o i8237.o topology.o alternative.o i8253.o tsc_32.o 
io_delay.o rtc.o
 
+obj-y                          += tls.o
 obj-$(CONFIG_STACKTRACE)       += stacktrace.o
 obj-y                          += cpu/
 obj-y                          += acpi/
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index 631af16..4d66a56 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -501,32 +501,15 @@ int copy_thread(int nr, unsigned long clone_flags, 
unsigned long esp,
                set_tsk_thread_flag(p, TIF_IO_BITMAP);
        }
 
+       err = 0;
+
        /*
         * Set a new TLS for the child thread?
         */
-       if (clone_flags & CLONE_SETTLS) {
-               struct desc_struct *desc;
-               struct user_desc info;
-               int idx;
-
-               err = -EFAULT;
-               if (copy_from_user(&info, (void __user *)childregs->esi, 
sizeof(info)))
-                       goto out;
-               err = -EINVAL;
-               if (LDT_empty(&info))
-                       goto out;
-
-               idx = info.entry_number;
-               if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX)
-                       goto out;
-
-               desc = p->thread.tls_array + idx - GDT_ENTRY_TLS_MIN;
-               desc->a = LDT_entry_a(&info);
-               desc->b = LDT_entry_b(&info);
-       }
+       if (clone_flags & CLONE_SETTLS)
+               err = do_set_thread_area(p, -1,
+                       (struct user_desc __user *)childregs->esi, 0);
 
-       err = 0;
- out:
        if (err && p->thread.io_bitmap_ptr) {
                kfree(p->thread.io_bitmap_ptr);
                p->thread.io_bitmap_max = 0;
@@ -872,120 +855,6 @@ unsigned long get_wchan(struct task_struct *p)
        return 0;
 }
 
-/*
- * sys_alloc_thread_area: get a yet unused TLS descriptor index.
- */
-static int get_free_idx(void)
-{
-       struct thread_struct *t = &current->thread;
-       int idx;
-
-       for (idx = 0; idx < GDT_ENTRY_TLS_ENTRIES; idx++)
-               if (desc_empty(t->tls_array + idx))
-                       return idx + GDT_ENTRY_TLS_MIN;
-       return -ESRCH;
-}
-
-/*
- * Set a given TLS descriptor:
- */
-asmlinkage int sys_set_thread_area(struct user_desc __user *u_info)
-{
-       struct thread_struct *t = &current->thread;
-       struct user_desc info;
-       struct desc_struct *desc;
-       int cpu, idx;
-
-       if (copy_from_user(&info, u_info, sizeof(info)))
-               return -EFAULT;
-       idx = info.entry_number;
-
-       /*
-        * index -1 means the kernel should try to find and
-        * allocate an empty descriptor:
-        */
-       if (idx == -1) {
-               idx = get_free_idx();
-               if (idx < 0)
-                       return idx;
-               if (put_user(idx, &u_info->entry_number))
-                       return -EFAULT;
-       }
-
-       if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX)
-               return -EINVAL;
-
-       desc = t->tls_array + idx - GDT_ENTRY_TLS_MIN;
-
-       /*
-        * We must not get preempted while modifying the TLS.
-        */
-       cpu = get_cpu();
-
-       if (LDT_empty(&info)) {
-               desc->a = 0;
-               desc->b = 0;
-       } else {
-               desc->a = LDT_entry_a(&info);
-               desc->b = LDT_entry_b(&info);
-       }
-       load_TLS(t, cpu);
-
-       put_cpu();
-
-       return 0;
-}
-
-/*
- * Get the current Thread-Local Storage area:
- */
-
-#define GET_BASE(desc) ( \
-       (((desc)->a >> 16) & 0x0000ffff) | \
-       (((desc)->b << 16) & 0x00ff0000) | \
-       ( (desc)->b        & 0xff000000)   )
-
-#define GET_LIMIT(desc) ( \
-       ((desc)->a & 0x0ffff) | \
-        ((desc)->b & 0xf0000) )
-       
-#define GET_32BIT(desc)                (((desc)->b >> 22) & 1)
-#define GET_CONTENTS(desc)     (((desc)->b >> 10) & 3)
-#define GET_WRITABLE(desc)     (((desc)->b >>  9) & 1)
-#define GET_LIMIT_PAGES(desc)  (((desc)->b >> 23) & 1)
-#define GET_PRESENT(desc)      (((desc)->b >> 15) & 1)
-#define GET_USEABLE(desc)      (((desc)->b >> 20) & 1)
-
-asmlinkage int sys_get_thread_area(struct user_desc __user *u_info)
-{
-       struct user_desc info;
-       struct desc_struct *desc;
-       int idx;
-
-       if (get_user(idx, &u_info->entry_number))
-               return -EFAULT;
-       if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX)
-               return -EINVAL;
-
-       memset(&info, 0, sizeof(info));
-
-       desc = current->thread.tls_array + idx - GDT_ENTRY_TLS_MIN;
-
-       info.entry_number = idx;
-       info.base_addr = GET_BASE(desc);
-       info.limit = GET_LIMIT(desc);
-       info.seg_32bit = GET_32BIT(desc);
-       info.contents = GET_CONTENTS(desc);
-       info.read_exec_only = !GET_WRITABLE(desc);
-       info.limit_in_pages = GET_LIMIT_PAGES(desc);
-       info.seg_not_present = !GET_PRESENT(desc);
-       info.useable = GET_USEABLE(desc);
-
-       if (copy_to_user(u_info, &info, sizeof(info)))
-               return -EFAULT;
-       return 0;
-}
-
 unsigned long arch_align_stack(unsigned long sp)
 {
        if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 9ea1d75..ccc9d68 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -524,7 +524,8 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned 
long rsp,
        if (clone_flags & CLONE_SETTLS) {
 #ifdef CONFIG_IA32_EMULATION
                if (test_thread_flag(TIF_IA32))
-                       err = ia32_child_tls(p, childregs); 
+                       err = do_set_thread_area(p, -1,
+                               (struct user_desc __user *)childregs->rsi, 0);
                else                    
 #endif  
                        err = do_arch_prctl(p, ARCH_SET_FS, childregs->r8); 
diff --git a/arch/x86/kernel/ptrace_32.c b/arch/x86/kernel/ptrace_32.c
index ff5431c..09227cf 100644
--- a/arch/x86/kernel/ptrace_32.c
+++ b/arch/x86/kernel/ptrace_32.c
@@ -276,85 +276,6 @@ void ptrace_disable(struct task_struct *child)
        clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
 }
 
-/*
- * Perform get_thread_area on behalf of the traced child.
- */
-static int
-ptrace_get_thread_area(struct task_struct *child,
-                      int idx, struct user_desc __user *user_desc)
-{
-       struct user_desc info;
-       struct desc_struct *desc;
-
-/*
- * Get the current Thread-Local Storage area:
- */
-
-#define GET_BASE(desc) ( \
-       (((desc)->a >> 16) & 0x0000ffff) | \
-       (((desc)->b << 16) & 0x00ff0000) | \
-       ( (desc)->b        & 0xff000000)   )
-
-#define GET_LIMIT(desc) ( \
-       ((desc)->a & 0x0ffff) | \
-        ((desc)->b & 0xf0000) )
-
-#define GET_32BIT(desc)                (((desc)->b >> 22) & 1)
-#define GET_CONTENTS(desc)     (((desc)->b >> 10) & 3)
-#define GET_WRITABLE(desc)     (((desc)->b >>  9) & 1)
-#define GET_LIMIT_PAGES(desc)  (((desc)->b >> 23) & 1)
-#define GET_PRESENT(desc)      (((desc)->b >> 15) & 1)
-#define GET_USEABLE(desc)      (((desc)->b >> 20) & 1)
-
-       if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX)
-               return -EINVAL;
-
-       desc = child->thread.tls_array + idx - GDT_ENTRY_TLS_MIN;
-
-       info.entry_number = idx;
-       info.base_addr = GET_BASE(desc);
-       info.limit = GET_LIMIT(desc);
-       info.seg_32bit = GET_32BIT(desc);
-       info.contents = GET_CONTENTS(desc);
-       info.read_exec_only = !GET_WRITABLE(desc);
-       info.limit_in_pages = GET_LIMIT_PAGES(desc);
-       info.seg_not_present = !GET_PRESENT(desc);
-       info.useable = GET_USEABLE(desc);
-
-       if (copy_to_user(user_desc, &info, sizeof(info)))
-               return -EFAULT;
-
-       return 0;
-}
-
-/*
- * Perform set_thread_area on behalf of the traced child.
- */
-static int
-ptrace_set_thread_area(struct task_struct *child,
-                      int idx, struct user_desc __user *user_desc)
-{
-       struct user_desc info;
-       struct desc_struct *desc;
-
-       if (copy_from_user(&info, user_desc, sizeof(info)))
-               return -EFAULT;
-
-       if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX)
-               return -EINVAL;
-
-       desc = child->thread.tls_array + idx - GDT_ENTRY_TLS_MIN;
-       if (LDT_empty(&info)) {
-               desc->a = 0;
-               desc->b = 0;
-       } else {
-               desc->a = LDT_entry_a(&info);
-               desc->b = LDT_entry_b(&info);
-       }
-
-       return 0;
-}
-
 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 {
        struct user * dummy = NULL;
@@ -601,13 +522,17 @@ long arch_ptrace(struct task_struct *child, long request, 
long addr, long data)
        }
 
        case PTRACE_GET_THREAD_AREA:
-               ret = ptrace_get_thread_area(child, addr,
-                                       (struct user_desc __user *) data);
+               if (addr < 0)
+                       return -EIO;
+               ret = do_get_thread_area(child, addr,
+                                        (struct user_desc __user *) data);
                break;
 
        case PTRACE_SET_THREAD_AREA:
-               ret = ptrace_set_thread_area(child, addr,
-                                       (struct user_desc __user *) data);
+               if (addr < 0)
+                       return -EIO;
+               ret = do_set_thread_area(child, addr,
+                                        (struct user_desc __user *) data, 0);
                break;
 
        default:
diff --git a/arch/x86/kernel/ptrace_64.c b/arch/x86/kernel/ptrace_64.c
index 1edece3..375fadc 100644
--- a/arch/x86/kernel/ptrace_64.c
+++ b/arch/x86/kernel/ptrace_64.c
@@ -474,23 +474,19 @@ long arch_ptrace(struct task_struct *child, long request, 
long addr, long data)
                   64bit debugger to fully examine them too. Better
                   don't use it against 64bit processes, use
                   PTRACE_ARCH_PRCTL instead. */
-       case PTRACE_SET_THREAD_AREA: {
-               struct user_desc __user *p;
-               int old; 
-               p = (struct user_desc __user *)data;
-               get_user(old,  &p->entry_number); 
-               put_user(addr, &p->entry_number);
-               ret = do_set_thread_area(&child->thread, p);
-               put_user(old,  &p->entry_number); 
-               break;
        case PTRACE_GET_THREAD_AREA:
-               p = (struct user_desc __user *)data;
-               get_user(old,  &p->entry_number); 
-               put_user(addr, &p->entry_number);
-               ret = do_get_thread_area(&child->thread, p);
-               put_user(old,  &p->entry_number); 
+               if (addr < 0)
+                       return -EIO;
+               ret = do_get_thread_area(child, addr,
+                                        (struct user_desc __user *) data);
+
+               break;
+       case PTRACE_SET_THREAD_AREA:
+               if (addr < 0)
+                       return -EIO;
+               ret = do_set_thread_area(child, addr,
+                                        (struct user_desc __user *) data, 0);
                break;
-       } 
 #endif
                /* normal 64bit interface to access TLS data. 
                   Works just like arch_prctl, except that the arguments
diff --git a/arch/x86/kernel/tls.c b/arch/x86/kernel/tls.c
index 5291596..67a3776 100644
--- a/arch/x86/kernel/tls.c
+++ b/arch/x86/kernel/tls.c
@@ -19,31 +19,34 @@ static int get_free_idx(void)
        int idx;
 
        for (idx = 0; idx < GDT_ENTRY_TLS_ENTRIES; idx++)
-               if (desc_empty((struct n_desc_struct *)(t->tls_array) + idx))
+               if (desc_empty(&t->tls_array[idx]))
                        return idx + GDT_ENTRY_TLS_MIN;
        return -ESRCH;
 }
 
 /*
  * Set a given TLS descriptor:
- * When you want addresses > 32bit use arch_prctl()
  */
-int do_set_thread_area(struct thread_struct *t, struct user_desc __user 
*u_info)
+int do_set_thread_area(struct task_struct *p, int idx,
+                      struct user_desc __user *u_info,
+                      int can_allocate)
 {
+       struct thread_struct *t = &p->thread;
        struct user_desc info;
-       struct n_desc_struct *desc;
-       int cpu, idx;
+       u32 *desc;
+       int cpu;
 
        if (copy_from_user(&info, u_info, sizeof(info)))
                return -EFAULT;
 
-       idx = info.entry_number;
+       if (idx == -1)
+               idx = info.entry_number;
 
        /*
         * index -1 means the kernel should try to find and
         * allocate an empty descriptor:
         */
-       if (idx == -1) {
+       if (idx == -1 && can_allocate) {
                idx = get_free_idx();
                if (idx < 0)
                        return idx;
@@ -54,7 +57,7 @@ int do_set_thread_area(struct thread_struct *t, struct 
user_desc __user *u_info)
        if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX)
                return -EINVAL;
 
-       desc = ((struct n_desc_struct *)t->tls_array) + idx - GDT_ENTRY_TLS_MIN;
+       desc = (u32 *) &t->tls_array[idx - GDT_ENTRY_TLS_MIN];
 
        /*
         * We must not get preempted while modifying the TLS.
@@ -62,11 +65,11 @@ int do_set_thread_area(struct thread_struct *t, struct 
user_desc __user *u_info)
        cpu = get_cpu();
 
        if (LDT_empty(&info)) {
-               desc->a = 0;
-               desc->b = 0;
+               desc[0] = 0;
+               desc[1] = 0;
        } else {
-               desc->a = LDT_entry_a(&info);
-               desc->b = LDT_entry_b(&info);
+               desc[0] = LDT_entry_a(&info);
+               desc[1] = LDT_entry_b(&info);
        }
        if (t == &current->thread)
                load_TLS(t, cpu);
@@ -75,9 +78,9 @@ int do_set_thread_area(struct thread_struct *t, struct 
user_desc __user *u_info)
        return 0;
 }
 
-asmlinkage long sys32_set_thread_area(struct user_desc __user *u_info)
+asmlinkage int sys_set_thread_area(struct user_desc __user *u_info)
 {
-       return do_set_thread_area(&current->thread, u_info);
+       return do_set_thread_area(current, -1, u_info, 1);
 }
 
 
@@ -85,34 +88,32 @@ asmlinkage long sys32_set_thread_area(struct user_desc 
__user *u_info)
  * Get the current Thread-Local Storage area:
  */
 
-#define GET_LIMIT(desc) ( \
-       ((desc)->a & 0x0ffff) | \
-        ((desc)->b & 0xf0000) )
-
-#define GET_32BIT(desc)                (((desc)->b >> 22) & 1)
-#define GET_CONTENTS(desc)     (((desc)->b >> 10) & 3)
-#define GET_WRITABLE(desc)     (((desc)->b >>  9) & 1)
-#define GET_LIMIT_PAGES(desc)  (((desc)->b >> 23) & 1)
-#define GET_PRESENT(desc)      (((desc)->b >> 15) & 1)
-#define GET_USEABLE(desc)      (((desc)->b >> 20) & 1)
-#define GET_LONGMODE(desc)     (((desc)->b >> 21) & 1)
-
-int do_get_thread_area(struct thread_struct *t, struct user_desc __user 
*u_info)
+#define GET_LIMIT(desc)                (((desc)[0] & 0x0ffff) | ((desc)[1] & 
0xf0000))
+#define GET_32BIT(desc)                (((desc)[1] >> 22) & 1)
+#define GET_CONTENTS(desc)     (((desc)[1] >> 10) & 3)
+#define GET_WRITABLE(desc)     (((desc)[1] >>  9) & 1)
+#define GET_LIMIT_PAGES(desc)  (((desc)[1] >> 23) & 1)
+#define GET_PRESENT(desc)      (((desc)[1] >> 15) & 1)
+#define GET_USEABLE(desc)      (((desc)[1] >> 20) & 1)
+#define GET_LONGMODE(desc)     (((desc)[1] >> 21) & 1)
+
+int do_get_thread_area(struct task_struct *p, int idx,
+                      struct user_desc __user *u_info)
 {
+       struct thread_struct *t = &p->thread;
        struct user_desc info;
-       struct n_desc_struct *desc;
-       int idx;
+       u32 *desc;
 
-       if (get_user(idx, &u_info->entry_number))
+       if (idx == -1 && get_user(idx, &u_info->entry_number))
                return -EFAULT;
        if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX)
                return -EINVAL;
 
-       desc = ((struct n_desc_struct *)t->tls_array) + idx - GDT_ENTRY_TLS_MIN;
+       desc = (u32 *) &t->tls_array[idx - GDT_ENTRY_TLS_MIN];
 
        memset(&info, 0, sizeof(struct user_desc));
        info.entry_number = idx;
-       info.base_addr = get_desc_base(desc);
+       info.base_addr = get_desc_base((void *)desc);
        info.limit = GET_LIMIT(desc);
        info.seg_32bit = GET_32BIT(desc);
        info.contents = GET_CONTENTS(desc);
@@ -120,39 +121,16 @@ int do_get_thread_area(struct thread_struct *t, struct 
user_desc __user *u_info)
        info.limit_in_pages = GET_LIMIT_PAGES(desc);
        info.seg_not_present = !GET_PRESENT(desc);
        info.useable = GET_USEABLE(desc);
+#ifdef CONFIG_X86_64
        info.lm = GET_LONGMODE(desc);
+#endif
 
        if (copy_to_user(u_info, &info, sizeof(info)))
                return -EFAULT;
        return 0;
 }
 
-asmlinkage long sys32_get_thread_area(struct user_desc __user *u_info)
+asmlinkage int sys_get_thread_area(struct user_desc __user *u_info)
 {
-       return do_get_thread_area(&current->thread, u_info);
-}
-
-
-int ia32_child_tls(struct task_struct *p, struct pt_regs *childregs)
-{
-       struct n_desc_struct *desc;
-       struct user_desc info;
-       struct user_desc __user *cp;
-       int idx;
-
-       cp = (void __user *)childregs->rsi;
-       if (copy_from_user(&info, cp, sizeof(info)))
-               return -EFAULT;
-       if (LDT_empty(&info))
-               return -EINVAL;
-
-       idx = info.entry_number;
-       if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX)
-               return -EINVAL;
-
-       desc = (struct n_desc_struct *)(p->thread.tls_array) + idx - 
GDT_ENTRY_TLS_MIN;
-       desc->a = LDT_entry_a(&info);
-       desc->b = LDT_entry_b(&info);
-
-       return 0;
+       return do_get_thread_area(current, -1, u_info);
 }
diff --git a/include/asm-x86/ia32.h b/include/asm-x86/ia32.h
index 0190b7c..aa97332 100644
--- a/include/asm-x86/ia32.h
+++ b/include/asm-x86/ia32.h
@@ -159,12 +159,6 @@ struct ustat32 {
 #define IA32_STACK_TOP IA32_PAGE_OFFSET
 
 #ifdef __KERNEL__
-struct user_desc;
-struct siginfo_t;
-int do_get_thread_area(struct thread_struct *t, struct user_desc __user *info);
-int do_set_thread_area(struct thread_struct *t, struct user_desc __user *info);
-int ia32_child_tls(struct task_struct *p, struct pt_regs *childregs);
-
 struct linux_binprm;
 extern int ia32_setup_arg_pages(struct linux_binprm *bprm,
                                unsigned long stack_top, int exec_stack);
diff --git a/include/asm-x86/ptrace.h b/include/asm-x86/ptrace.h
index 51ddb25..105d153 100644
--- a/include/asm-x86/ptrace.h
+++ b/include/asm-x86/ptrace.h
@@ -137,6 +137,17 @@ enum {
 };
 #endif /* __KERNEL__ */
 #endif /* !__i386__ */
+
+#ifdef __KERNEL__
+
+struct user_desc;
+extern int do_get_thread_area(struct task_struct *p, int idx,
+                             struct user_desc __user *info);
+extern int do_set_thread_area(struct task_struct *p, int idx,
+                             struct user_desc __user *info, int can_allocate);
+
+#endif /* __KERNEL__ */
+
 #endif /* !__ASSEMBLY__ */
 
 #endif
-
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