* FPU lazy state save handling...
*/
-#define kernel_fpu_end() stts()
-
#define unlazy_fpu(tsk) do { \
if ((tsk)->thread_info->status & TS_USEDFPU) \
save_init_fpu(tsk); \
} while (0)
+/* Ignore delayed exceptions from user space */
+static inline void tolerant_fwait(void)
+{
+ asm volatile("1: fwait\n"
+ "2:\n"
+ " .section __ex_table,\"a\"\n"
+ " .align 8\n"
+ " .quad 1b,2b\n"
+ " .previous\n");
+}
+
#define clear_fpu(tsk) do { \
if ((tsk)->thread_info->status & TS_USEDFPU) { \
- asm volatile("fnclex ; fwait"); \
+ tolerant_fwait(); \
(tsk)->thread_info->status &= ~TS_USEDFPU; \
stts(); \
} \
static inline void kernel_fpu_begin(void)
{
struct thread_info *me = current_thread_info();
+ preempt_disable();
if (me->status & TS_USEDFPU) {
asm volatile("rex64 ; fxsave %0 ; fnclex"
: "=m" (me->task->thread.i387.fxsave));
clts();
}
+static inline void kernel_fpu_end(void)
+{
+ stts();
+ preempt_enable();
+}
+
static inline void save_init_fpu( struct task_struct *tsk )
{
- asm volatile( "fxsave %0 ; fnclex"
+ asm volatile( "rex64 ; fxsave %0 ; fnclex"
: "=m" (tsk->thread.i387.fxsave));
tsk->thread_info->status &= ~TS_USEDFPU;
stts();