i387: move TS_USEDFPU clearing out of __save_init_fpu and into callers

Touching TS_USEDFPU without touching CR0.TS is confusing, so don't do
it.  By moving it into the callers, we always do the TS_USEDFPU next to
the CR0.TS accesses in the source code, and it's much easier to see how
the two go hand in hand.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/x86/include/asm/i387.h b/arch/x86/include/asm/i387.h
index f704be2..1e12c2d 100644 (file)
--- a/arch/x86/include/asm/i387.h
+++ b/arch/x86/include/asm/i387.h
@@ -259,7 +259,6 @@ static inline void fpu_save_init(struct fpu *fpu)
 static inline void __save_init_fpu(struct task_struct *tsk)
 {
        fpu_save_init(&tsk->thread.fpu);
-       task_thread_info(tsk)->status &= ~TS_USEDFPU;
 }
 
 static inline int fpu_fxrstor_checking(struct fpu *fpu)
@@ -290,6 +289,7 @@ static inline void __unlazy_fpu(struct task_struct *tsk)
 {
        if (task_thread_info(tsk)->status & TS_USEDFPU) {
                __save_init_fpu(tsk);
+               task_thread_info(tsk)->status &= ~TS_USEDFPU;
                stts();
        } else
                tsk->fpu_counter = 0;
@@ -356,9 +356,11 @@ static inline void kernel_fpu_begin(void)
 
        WARN_ON_ONCE(!irq_fpu_usable());
        preempt_disable();
-       if (me->status & TS_USEDFPU)
+       if (me->status & TS_USEDFPU) {
                __save_init_fpu(me->task);
-       else
+               me->status &= ~TS_USEDFPU;
+               /* We do 'stts()' in kernel_fpu_end() */
+       } else
                clts();
 }
 
@@ -449,6 +451,7 @@ static inline void save_init_fpu(struct task_struct *tsk)
        WARN_ON_ONCE(!(task_thread_info(tsk)->status & TS_USEDFPU));
        preempt_disable();
        __save_init_fpu(tsk);
+       task_thread_info(tsk)->status &= ~TS_USEDFPU;
        stts();
        preempt_enable();
 }