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powerpc: Replace find_linux_pte with find_linux_pte_or_hugepte

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Replace find_linux_pte with find_linux_pte_or_hugepte and explicitly
document why we don't need to handle transparent hugepages at callsites.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Aneesh Kumar K.V
2013-06-20 14:30:18 +05:30
committed by Benjamin Herrenschmidt
parent ac52ae4721
commit 12bc9f6fc1
7 changed files with 36 additions and 33 deletions
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8
arch/powerpc/mm/hugetlbpage.c
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@@ -105,6 +105,7 @@ int pgd_huge(pgd_t pgd)
pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
{
/* Only called for hugetlbfs pages, hence can ignore THP */
return find_linux_pte_or_hugepte(mm->pgd, addr, NULL);
}
@@ -673,11 +674,14 @@ follow_huge_addr(struct mm_struct *mm, unsigned long address, int write)
struct page *page;
unsigned shift;
unsigned long mask;
/*
* Transparent hugepages are handled by generic code. We can skip them
* here.
*/
ptep = find_linux_pte_or_hugepte(mm->pgd, address, &shift);
/* Verify it is a huge page else bail. */
if (!ptep || !shift)
if (!ptep || !shift || pmd_trans_huge(*(pmd_t *)ptep))
return ERR_PTR(-EINVAL);
mask = (1UL << shift) - 1;