diff mbox series

[03/23] arm64/hugetlb: pte_alloc_huge() pte_offset_huge()

Message ID dda2885-929b-c278-14e-5f447e9eec52@google.com
State New
Headers
Series arch: allow pte_offset_map[_lock]() to fail |

Commit Message

Hugh Dickins May 10, 2023, 4:45 a.m. UTC 
  pte_alloc_map() expects to be followed by pte_unmap(), but hugetlb omits
that: to keep balance in future, use the recently added pte_alloc_huge()
instead; with pte_offset_huge() a better name for pte_offset_kernel().

Signed-off-by: Hugh Dickins <hughd@google.com>
---
 arch/arm64/mm/hugetlbpage.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

Comments

Catalin Marinas May 25, 2023, 4:37 p.m. UTC | #1 
On Tue, May 09, 2023 at 09:45:57PM -0700, Hugh Dickins wrote:
> pte_alloc_map() expects to be followed by pte_unmap(), but hugetlb omits
> that: to keep balance in future, use the recently added pte_alloc_huge()
> instead; with pte_offset_huge() a better name for pte_offset_kernel().
> 
> Signed-off-by: Hugh Dickins <hughd@google.com>

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
diff mbox series

Patch

diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index 95364e8bdc19..21716c940682 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -307,14 +307,7 @@  pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
 			return NULL;
 
 		WARN_ON(addr & (sz - 1));
-		/*
-		 * Note that if this code were ever ported to the
-		 * 32-bit arm platform then it will cause trouble in
-		 * the case where CONFIG_HIGHPTE is set, since there
-		 * will be no pte_unmap() to correspond with this
-		 * pte_alloc_map().
-		 */
-		ptep = pte_alloc_map(mm, pmdp, addr);
+		ptep = pte_alloc_huge(mm, pmdp, addr);
 	} else if (sz == PMD_SIZE) {
 		if (want_pmd_share(vma, addr) && pud_none(READ_ONCE(*pudp)))
 			ptep = huge_pmd_share(mm, vma, addr, pudp);
@@ -366,7 +359,7 @@  pte_t *huge_pte_offset(struct mm_struct *mm,
 		return (pte_t *)pmdp;
 
 	if (sz == CONT_PTE_SIZE)
-		return pte_offset_kernel(pmdp, (addr & CONT_PTE_MASK));
+		return pte_offset_huge(pmdp, (addr & CONT_PTE_MASK));
 
 	return NULL;
 }