um: Skip TLB flushing where not needed
Skip TLB flushing for all cases where it is not needed, not just flush_tlb_mm_range Signed-off-by: Anton Ivanov <anton.ivanov@cambridgegreys.com> Signed-off-by: Richard Weinberger <richard@nod.at>
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@ -520,6 +520,13 @@ pte_t *addr_pte(struct task_struct *task, unsigned long addr)
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void flush_tlb_all(void)
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{
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/*
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* Don't bother flushing if this address space is about to be
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* destroyed.
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*/
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if (atomic_read(¤t->mm->mm_users) == 0)
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return;
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flush_tlb_mm(current->mm);
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}
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@ -541,6 +548,13 @@ void __flush_tlb_one(unsigned long addr)
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static void fix_range(struct mm_struct *mm, unsigned long start_addr,
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unsigned long end_addr, int force)
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{
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/*
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* Don't bother flushing if this address space is about to be
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* destroyed.
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*/
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if (atomic_read(&mm->mm_users) == 0)
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return;
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fix_range_common(mm, start_addr, end_addr, force);
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}
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@ -556,13 +570,6 @@ EXPORT_SYMBOL(flush_tlb_range);
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void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
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unsigned long end)
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{
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/*
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* Don't bother flushing if this address space is about to be
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* destroyed.
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*/
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if (atomic_read(&mm->mm_users) == 0)
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return;
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fix_range(mm, start, end, 0);
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}
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