[PATCH] i386: avoid redundant preempt_disable in __unlazy_fpu

There are two callers of __unlazy_fpu, unlazy_fpu and __switch_to, and
none of them appear to require additional preempt_disable/enable here.
Let's open-code save_init_fpu in __unlazy_fpu to save a few ops.

Signed-off-by: Jan Kiszka <jan.kiszka@web.de>
Signed-off-by: Andi Kleen <ak@suse.de>

diff --git a/include/asm-i386/i387.h b/include/asm-i386/i387.h
index 49dc8e1..cdd1e24 100644 (file)
--- a/include/asm-i386/i387.h
+++ b/include/asm-i386/i387.h
@@ -74,11 +74,12 @@ static inline void __save_init_fpu( struct task_struct *tsk )
        task_thread_info(tsk)->status &= ~TS_USEDFPU;
 }
 
-#define __unlazy_fpu( tsk ) do { \
-       if (task_thread_info(tsk)->status & TS_USEDFPU) \
-               save_init_fpu( tsk );                   \
-       else                                            \
-               tsk->fpu_counter = 0;                   \
+#define __unlazy_fpu( tsk ) do {                               \
+       if (task_thread_info(tsk)->status & TS_USEDFPU) {       \
+               __save_init_fpu(tsk);                           \
+               stts();                                         \
+       } else                                                  \
+               tsk->fpu_counter = 0;                           \
 } while (0)
 
 #define __clear_fpu( tsk )                                     \