Create a new layer for the in-table PTE manipulation APIs. For now, The
existing API is prefixed with double underscore to become the
arch-private API and the public API is just a simple wrapper that calls
the private API.
The public API implementation will subsequently be used to transparently
manipulate the contiguous bit where appropriate. But since there are
already some contig-aware users (e.g. hugetlb, kernel mapper), we must
first ensure those users use the private API directly so that the future
contig-bit manipulations in the public API do not interfere with those
existing uses.
No behavioural changes intended.
Signed-off-by: Ryan Roberts <ryan.roberts@xxxxxxx>
---
arch/arm64/include/asm/pgtable.h | 10 ++++++++--
arch/arm64/mm/hugetlbpage.c | 4 ++--
2 files changed, 10 insertions(+), 4 deletions(-)
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 06b5dca469f5..2a525e72537d 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -941,8 +941,7 @@ static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
-#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
-static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
+static inline pte_t __ptep_get_and_clear(struct mm_struct *mm,
unsigned long address, pte_t *ptep)
{
pte_t pte = __pte(xchg_relaxed(&pte_val(*ptep), 0));
@@ -1146,6 +1145,13 @@ static inline void pte_clear(struct mm_struct *mm,
__pte_clear(mm, addr, ptep);
}
+#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
+static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
+ unsigned long addr, pte_t *ptep)
+{
+ return __ptep_get_and_clear(mm, addr, ptep);
+}
+
#endif /* !__ASSEMBLY__ */
#endif /* __ASM_PGTABLE_H */
diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index eebd3107c7d2..931a17f3c3fb 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -188,7 +188,7 @@ static pte_t get_clear_contig(struct mm_struct *mm,
unsigned long i;
for (i = 0; i < ncontig; i++, addr += pgsize, ptep++) {
- pte_t pte = ptep_get_and_clear(mm, addr, ptep);
+ pte_t pte = __ptep_get_and_clear(mm, addr, ptep);
/*
* If HW_AFDBM is enabled, then the HW could turn on
@@ -429,7 +429,7 @@ pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
pte_t orig_pte = ptep_get(ptep);
if (!pte_cont(orig_pte))
- return ptep_get_and_clear(mm, addr, ptep);
+ return __ptep_get_and_clear(mm, addr, ptep);
ncontig = find_num_contig(mm, addr, ptep, &pgsize);
--
2.25.1
