ptep_test_and_clear_young i386 vs. x86_64

From: "contik32@xxxxxxxxx" <contik32@xxxxxxxxx>
Date: Wed, 19 Sep 2007 18:09:52 -0000

Hi All!

Is there any special reason why ptep_test_and_clear_young()
implementation for x86_64 does not call pte_update()?

Compare the following:

include/asm-x86_64/pgtable.h:

static inline int ptep_test_and_clear_young(struct vm_area_struct
*vma, unsigned long addr, pte_t *ptep)
{
if (!pte_young(*ptep))
return 0;
return test_and_clear_bit(_PAGE_BIT_ACCESSED, &ptep->pte);
}

include/asm-i386/pgtable.h:

#define ptep_test_and_clear_young(vma, addr, ptep) ({ \
int __ret = 0; \
if (pte_young(*(ptep))) \
__ret = test_and_clear_bit(_PAGE_BIT_ACCESSED, \
&(ptep)->pte_low); \
if (__ret) \
pte_update((vma)->vm_mm, addr, ptep); \
__ret; \
})

Sincerely,

Slava Abramov

.

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