Merge with /home/shaggy/git/linus-clean/

[powerpc.git] / arch / i386 / kernel / process.c

diff --git a/arch/i386/kernel/process.c b/arch/i386/kernel/process.c
index 1cb261f..2185377 100644 (file)
--- a/arch/i386/kernel/process.c
+++ b/arch/i386/kernel/process.c
@@ -48,6 +48,7 @@
 #include <asm/processor.h>
 #include <asm/i387.h>
 #include <asm/desc.h>
+#include <asm/vm86.h>
 #ifdef CONFIG_MATH_EMULATION
 #include <asm/math_emu.h>
 #endif
@@ -308,9 +309,7 @@ void show_regs(struct pt_regs * regs)
        cr0 = read_cr0();
        cr2 = read_cr2();
        cr3 = read_cr3();
-       if (current_cpu_data.x86 > 4) {
-               cr4 = read_cr4();
-       }
+       cr4 = read_cr4_safe();
        printk("CR0: %08lx CR2: %08lx CR3: %08lx CR4: %08lx\n", cr0, cr2, cr3, cr4);
        show_trace(NULL, &regs->esp);
 }
@@ -393,13 +392,6 @@ void flush_thread(void)
 {
        struct task_struct *tsk = current;
 
-       /*
-        * Remove function-return probe instances associated with this task
-        * and put them back on the free list. Do not insert an exit probe for
-        * this function, it will be disabled by kprobe_flush_task if you do.
-        */
-       kprobe_flush_task(tsk);
-
        memset(tsk->thread.debugreg, 0, sizeof(unsigned long)*8);
        memset(tsk->thread.tls_array, 0, sizeof(tsk->thread.tls_array));        
        /*
@@ -411,17 +403,7 @@ void flush_thread(void)
 
 void release_thread(struct task_struct *dead_task)
 {
-       if (dead_task->mm) {
-               // temporary debugging check
-               if (dead_task->mm->context.size) {
-                       printk("WARNING: dead process %8s still has LDT? <%p/%d>\n",
-                                       dead_task->comm,
-                                       dead_task->mm->context.ldt,
-                                       dead_task->mm->context.size);
-                       BUG();
-               }
-       }
-
+       BUG_ON(dead_task->mm);
        release_vm86_irqs(dead_task);
 }
 
@@ -442,18 +424,7 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long esp,
        struct task_struct *tsk;
        int err;
 
-       childregs = ((struct pt_regs *) (THREAD_SIZE + (unsigned long) p->thread_info)) - 1;
-       /*
-        * The below -8 is to reserve 8 bytes on top of the ring0 stack.
-        * This is necessary to guarantee that the entire "struct pt_regs"
-        * is accessable even if the CPU haven't stored the SS/ESP registers
-        * on the stack (interrupt gate does not save these registers
-        * when switching to the same priv ring).
-        * Therefore beware: accessing the xss/esp fields of the
-        * "struct pt_regs" is possible, but they may contain the
-        * completely wrong values.
-        */
-       childregs = (struct pt_regs *) ((unsigned long) childregs - 8);
+       childregs = task_pt_regs(p);
        *childregs = *regs;
        childregs->eax = 0;
        childregs->esp = esp;
@@ -558,10 +529,7 @@ EXPORT_SYMBOL(dump_thread);
  */
 int dump_task_regs(struct task_struct *tsk, elf_gregset_t *regs)
 {
-       struct pt_regs ptregs;
-       
-       ptregs = *(struct pt_regs *)
-               ((unsigned long)tsk->thread_info+THREAD_SIZE - sizeof(ptregs));
+       struct pt_regs ptregs = *task_pt_regs(tsk);
        ptregs.xcs &= 0xffff;
        ptregs.xds &= 0xffff;
        ptregs.xes &= 0xffff;
@@ -617,8 +585,8 @@ static inline void disable_tsc(struct task_struct *prev_p,
         * gcc should eliminate the ->thread_info dereference if
         * has_secure_computing returns 0 at compile time (SECCOMP=n).
         */
-       prev = prev_p->thread_info;
-       next = next_p->thread_info;
+       prev = task_thread_info(prev_p);
+       next = task_thread_info(next_p);
 
        if (has_secure_computing(prev) || has_secure_computing(next)) {
                /* slow path here */
@@ -803,7 +771,7 @@ unsigned long get_wchan(struct task_struct *p)
        int count = 0;
        if (!p || p == current || p->state == TASK_RUNNING)
                return 0;
-       stack_page = (unsigned long)p->thread_info;
+       stack_page = (unsigned long)task_stack_page(p);
        esp = p->thread.esp;
        if (!stack_page || esp < stack_page || esp > top_esp+stack_page)
                return 0;