__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>

1 files changed, 7 insertions, 2 deletions

diff --git a/include/asm-mips/fpu.h b/include/asm-mips/fpu.h
index ea24e733b1bc..9c828b1f8218 100644
--- a/include/asm-mips/fpu.h
+++ b/include/asm-mips/fpu.h
@@ -80,9 +80,14 @@ do {									\
 
 #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 void restore_fp(struct task_struct *tsk)
 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;
         }