i387: Split up <asm/i387.h> into exported and internal interfaces

[pandora-kernel.git] / arch / x86 / kernel / traps.c

diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 482ec3a..ec61d4c 100644 (file)
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -54,6 +54,7 @@
 #include <asm/traps.h>
 #include <asm/desc.h>
 #include <asm/i387.h>
+#include <asm/fpu-internal.h>
 #include <asm/mce.h>
 
 #include <asm/mach_traps.h>
@@ -570,28 +571,6 @@ asmlinkage void __attribute__((weak)) smp_threshold_interrupt(void)
 {
 }
 
-/*
- * __math_state_restore assumes that cr0.TS is already clear and the
- * fpu state is all ready for use.  Used during context switch.
- */
-void __math_state_restore(void)
-{
-       struct thread_info *thread = current_thread_info();
-       struct task_struct *tsk = thread->task;
-
-       /*
-        * Paranoid restore. send a SIGSEGV if we fail to restore the state.
-        */
-       if (unlikely(restore_fpu_checking(tsk))) {
-               stts();
-               force_sig(SIGSEGV, tsk);
-               return;
-       }
-
-       thread->status |= TS_USEDFPU;   /* So we fnsave on switch_to() */
-       tsk->fpu_counter++;
-}
-
 /*
  * 'math_state_restore()' saves the current math information in the
  * old math state array, and gets the new ones from the current task
@@ -599,13 +578,12 @@ void __math_state_restore(void)
  * Careful.. There are problems with IBM-designed IRQ13 behaviour.
  * Don't touch unless you *really* know how it works.
  *
- * Must be called with kernel preemption disabled (in this case,
- * local interrupts are disabled at the call-site in entry.S).
+ * Must be called with kernel preemption disabled (eg with local
+ * local interrupts as in the case of do_device_not_available).
  */
-asmlinkage void math_state_restore(void)
+void math_state_restore(void)
 {
-       struct thread_info *thread = current_thread_info();
-       struct task_struct *tsk = thread->task;
+       struct task_struct *tsk = current;
 
        if (!tsk_used_math(tsk)) {
                local_irq_enable();
@@ -622,9 +600,17 @@ asmlinkage void math_state_restore(void)
                local_irq_disable();
        }
 
-       clts();                         /* Allow maths ops (or we recurse) */
+       __thread_fpu_begin(tsk);
+       /*
+        * Paranoid restore. send a SIGSEGV if we fail to restore the state.
+        */
+       if (unlikely(restore_fpu_checking(tsk))) {
+               __thread_fpu_end(tsk);
+               force_sig(SIGSEGV, tsk);
+               return;
+       }
 
-       __math_state_restore();
+       tsk->fpu_counter++;
 }
 EXPORT_SYMBOL_GPL(math_state_restore);