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mm, thp: use list_first_entry_or_null()

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Simplify the code with list_first_entry_or_null().

Signed-off-by: Geliang Tang <[email protected]>
Acked-by: Kirill A. Shutemov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Geliang Tang 2016-01-14 15:19:32 -08:00 • committed by Linus Torvalds
commit 146693471f
1 changed files with 3 additions and 6 deletions
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9
mm/pgtable-generic.c
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@ -176,13 +176,10 @@ pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
/* FIFO */
pgtable = pmd_huge_pte(mm, pmdp);
if (list_empty(&pgtable->lru))
pmd_huge_pte(mm, pmdp) = NULL;
else {
pmd_huge_pte(mm, pmdp) = list_entry(pgtable->lru.next,
struct page, lru);
pmd_huge_pte(mm, pmdp) = list_first_entry_or_null(&pgtable->lru,
struct page, lru);
if (pmd_huge_pte(mm, pmdp))
list_del(&pgtable->lru);
}
return pgtable;
}
#endif