parisc: factor out sid to protid conversion
Create a new __space_to_prot inline to convert the space id (mmu context) to a protection id. Sadly it doesn't look like the #ifdef can be eliminated since relying on the compiler to not truncate a bit on return (ctx >> SPACEID_SHIFT) << 1; seems a little dodgy. Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
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1 changed files with 10 additions and 5 deletions
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@ -34,14 +34,19 @@ destroy_context(struct mm_struct *mm)
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mm->context = 0;
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}
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static inline unsigned long __space_to_prot(mm_context_t ctx)
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{
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#if SPACEID_SHIFT == 0
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return context << 1;
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#else
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return context >> (SPACEID_SHIFT - 1);
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#endif
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}
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static inline void load_context(mm_context_t context)
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{
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mtsp(context, 3);
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#if SPACEID_SHIFT == 0
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mtctl(context << 1,8);
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#else
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mtctl(context >> (SPACEID_SHIFT - 1),8);
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#endif
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mtctl(__space_to_prot(context), 8);
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}
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static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk)
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