x86: Use get_desc_base()

Use get_desc_base() to get the base address in desc_struct

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
LKML-Reference: <20090718150853.GA11294@localhost.localdomain>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 4 insertions, 5 deletions

diff --git a/arch/x86/kernel/step.c b/arch/x86/kernel/step.c
index e8b9863ef8c4..3149032ff107 100644
--- a/arch/x86/kernel/step.c
+++ b/arch/x86/kernel/step.c
@@ -4,6 +4,7 @@
 #include <linux/sched.h>
 #include <linux/mm.h>
 #include <linux/ptrace.h>
+#include <asm/desc.h>
 
 unsigned long convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs)
 {
@@ -23,7 +24,7 @@ unsigned long convert_ip_to_linear(struct task_struct *child, struct pt_regs *re
          * and APM bios ones we just ignore here.
          */
         if ((seg & SEGMENT_TI_MASK) == SEGMENT_LDT) {
-                u32 *desc;
+                struct desc_struct *desc;
                 unsigned long base;
 
                 seg &= ~7UL;
@@ -33,12 +34,10 @@ unsigned long convert_ip_to_linear(struct task_struct *child, struct pt_regs *re
                         addr = -1L; /* bogus selector, access would fault */
                 else {
                         desc = child->mm->context.ldt + seg;
-                        base = ((desc[0] >> 16) |
-                                ((desc[1] & 0xff) << 16) |
-                                (desc[1] & 0xff000000));
+                        base = get_desc_base(desc);
 
                         /* 16-bit code segment? */
-                        if (!((desc[1] >> 22) & 1))
+                        if (!desc->d)
                                 addr &= 0xffff;
                         addr += base;
                 }