[PATCH] ia64: fix floating-point preemption problem

[powerpc.git] / include / asm-ia64 / processor.h

diff --git a/include/asm-ia64/processor.h b/include/asm-ia64/processor.h
index 9e1ba8b..91bbd1f 100644 (file)
--- a/include/asm-ia64/processor.h
+++ b/include/asm-ia64/processor.h
@@ -403,7 +403,10 @@ extern void ia64_setreg_unknown_kr (void);
  * task_struct at this point.
  */
 
-/* Return TRUE if task T owns the fph partition of the CPU we're running on. */
+/*
+ * Return TRUE if task T owns the fph partition of the CPU we're running on.
+ * Must be called from code that has preemption disabled.
+ */
 #define ia64_is_local_fpu_owner(t)                                                             \
 ({                                                                                             \
        struct task_struct *__ia64_islfo_task = (t);                                            \
@@ -411,7 +414,10 @@ extern void ia64_setreg_unknown_kr (void);
         && __ia64_islfo_task == (struct task_struct *) ia64_get_kr(IA64_KR_FPU_OWNER));        \
 })
 
-/* Mark task T as owning the fph partition of the CPU we're running on. */
+/*
+ * Mark task T as owning the fph partition of the CPU we're running on.
+ * Must be called from code that has preemption disabled.
+ */
 #define ia64_set_local_fpu_owner(t) do {                                               \
        struct task_struct *__ia64_slfo_task = (t);                                     \
        __ia64_slfo_task->thread.last_fph_cpu = smp_processor_id();                     \