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}
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}
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#ifdef CONFIG_FPU_LAZY
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#ifdef CONFIG_FPU_LAZY
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void scheduler_fpu_lazy_request(void)
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void scheduler_fpu_lazy_request(void)
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{
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{
- 
 
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restart:
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    fpu_enable();
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    fpu_enable();
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    spinlock_lock(&CPU->lock);
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    spinlock_lock(&CPU->lock);
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    /* Save old context */
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    /* Save old context */
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    if (CPU->fpu_owner != NULL) {  
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    if (CPU->fpu_owner != NULL) {  
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        spinlock_lock(&CPU->fpu_owner->lock);
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        spinlock_lock(&CPU->fpu_owner->lock);
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        fpu_context_save(CPU->fpu_owner->saved_fpu_context);
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        fpu_context_save(CPU->fpu_owner->saved_fpu_context);
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        /* don't prevent migration */
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        /* don't prevent migration */
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        CPU->fpu_owner->fpu_context_engaged=0;
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        CPU->fpu_owner->fpu_context_engaged=0;
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        spinlock_unlock(&CPU->fpu_owner->lock);
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        spinlock_unlock(&CPU->fpu_owner->lock);
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        CPU->fpu_owner = NULL;
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    }
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    }
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    spinlock_lock(&THREAD->lock);
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    spinlock_lock(&THREAD->lock);
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    if (THREAD->fpu_context_exists) {
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    if (THREAD->fpu_context_exists) {
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        fpu_context_restore(THREAD->saved_fpu_context);
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        fpu_context_restore(THREAD->saved_fpu_context);
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    } else {
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    } else {
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        /* Allocate FPU context */
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        /* Allocate FPU context */
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        if (!THREAD->saved_fpu_context) {
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        if (!THREAD->saved_fpu_context) {
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            /* Might sleep */
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            /* Might sleep */
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            spinlock_unlock(&THREAD->lock);
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            spinlock_unlock(&THREAD->lock);
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            spinlock_unlock(&CPU->lock);
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            THREAD->saved_fpu_context = slab_alloc(fpu_context_slab,
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            THREAD->saved_fpu_context = slab_alloc(fpu_context_slab,
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                                   0);
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                                   0);
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            spinlock_lock(&THREAD->lock);
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            /* We may have switched CPUs during slab_alloc */
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            goto restart;
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        }
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        }
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        fpu_init();
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        fpu_init();
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        THREAD->fpu_context_exists=1;
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        THREAD->fpu_context_exists=1;
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    }
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    }
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    CPU->fpu_owner=THREAD;
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    CPU->fpu_owner=THREAD;