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sparc64: Define pte_accessible() 

We can elide flush_tlb_*() calls when _PAGE_VALID is clear
as that is the test used to determine whether or not to
queue up a TLB flush in set_pte_at().

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2012-12-18 16:06:16 -08:00
parent 6cb9c36975
commit 4a9d1946b0
1 changed files with 7 additions and 1 deletions
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8
arch/sparc/include/asm/pgtable_64.h
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@ -617,6 +617,12 @@ static inline unsigned long pte_present(pte_t pte)
return val;
}
#define pte_accessible pte_accessible
static inline unsigned long pte_accessible(pte_t a)
{
return pte_val(a) & _PAGE_VALID;
}
static inline unsigned long pte_special(pte_t pte)
{
return pte_val(pte) & _PAGE_SPECIAL;
@ -802,7 +808,7 @@ static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr,
* SUN4V NOTE: _PAGE_VALID is the same value in both the SUN4U
* and SUN4V pte layout, so this inline test is fine.
*/
if (likely(mm != &init_mm) && (pte_val(orig) & _PAGE_VALID))
if (likely(mm != &init_mm) && pte_accessible(orig))
tlb_batch_add(mm, addr, ptep, orig, fullmm);
}