int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
int index;
if (radix_enabled())
index = radix__init_new_context(mm);
else
index = hash__init_new_context(mm);
if (index < 0)
return index;
mm->context.id = index;
#ifdef CONFIG_PPC_64K_PAGES
mm->context.pte_frag = NULL;
#endif
#ifdef CONFIG_SPAPR_TCE_IOMMU
mm_iommu_init(mm);
#endif
atomic_set(&mm->context.active_cpus, 0);
atomic_set(&mm->context.copros, 0);
return 0;
}
int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
int index;
index = __init_new_context();
if (index < 0)
return index;
if (radix_enabled()) {
radix__init_new_context(mm, index);
} else {
/* The old code would re-promote on fork, we don't do that
* when using slices as it could cause problem promoting slices
* that have been forced down to 4K
*
* For book3s we have MMU_NO_CONTEXT set to be ~0. Hence check
* explicitly against context.id == 0. This ensures that we
* properly initialize context slice details for newly allocated
* mm's (which will have id == 0) and don't alter context slice
* inherited via fork (which will have id != 0).
*
* We should not be calling init_new_context() on init_mm. Hence a
* check against 0 is ok.
*/
if (mm->context.id == 0)
slice_set_user_psize(mm, mmu_virtual_psize);
subpage_prot_init_new_context(mm);
}
mm->context.id = index;
#ifdef CONFIG_PPC_ICSWX
mm->context.cop_lockp = kmalloc(sizeof(spinlock_t), GFP_KERNEL);
if (!mm->context.cop_lockp) {
__destroy_context(index);
subpage_prot_free(mm);
mm->context.id = MMU_NO_CONTEXT;
return -ENOMEM;
}
spin_lock_init(mm->context.cop_lockp);
#endif /* CONFIG_PPC_ICSWX */
#ifdef CONFIG_PPC_64K_PAGES
mm->context.pte_frag = NULL;
#endif
#ifdef CONFIG_SPAPR_TCE_IOMMU
mm_iommu_init(&mm->context);
#endif
return 0;
}
