return value of ptep_get_and_clear

[Kumar Gala]

ptep_get_and_clear has a signature that looks something like:

static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned 
long addr,
                                       pte_t *ptep)

It appears that its suppose to return the pte_t pointed to by ptep 
before its modified.  Why do we bother doing this?  The caller seems 
perfectly able to dereference ptep and hold on to it.  Am I missing 
something here?

If not, I'll work up a set of patches to change ptep_get_and_clear and 
its callers for post 2.6.12 release.

- kumar

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