Kumar Gala wrote:
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?
You need to be able to *atomically* clear the pte and retrieve the
old value.
Nick
--
SUSE Labs, Novell Inc.
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