Merge branch 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[karo-tx-linux.git] / arch / x86 / kernel / traps.c

diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 6fe85c272a2b0241dfafd522657146effb707c8b..83264922a8786e5a6028df55bee538b4d08af13b 100644 (file)
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -794,6 +794,28 @@ 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
@@ -825,17 +847,8 @@ asmlinkage void math_state_restore(void)
        }
 
        clts();                         /* Allow maths ops (or we recurse) */
-       /*
-        * 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();
 }
 EXPORT_SYMBOL_GPL(math_state_restore);