__compute_return_epc() uses CFC1 instruction which might result in a
coprocessor unusable exception since the process can lose its fpu
context by preemption.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/include/asm-mips/fpu.h b/include/asm-mips/fpu.h
index ea24e73..9c828b1 100644
--- a/include/asm-mips/fpu.h
+++ b/include/asm-mips/fpu.h
@@ -80,9 +80,14 @@
#define clear_fpu_owner() clear_thread_flag(TIF_USEDFPU)
+static inline int __is_fpu_owner(void)
+{
+ return test_thread_flag(TIF_USEDFPU);
+}
+
static inline int is_fpu_owner(void)
{
- return cpu_has_fpu && test_thread_flag(TIF_USEDFPU);
+ return cpu_has_fpu && __is_fpu_owner();
}
static inline void own_fpu(void)
@@ -127,7 +132,7 @@
static inline fpureg_t *get_fpu_regs(struct task_struct *tsk)
{
if (cpu_has_fpu) {
- if ((tsk == current) && is_fpu_owner())
+ if ((tsk == current) && __is_fpu_owner())
_save_fp(current);
return tsk->thread.fpu.hard.fpr;
}