mm/thp: remove pmd_huge_split_prepare()

[mirror_ubuntu-jammy-kernel.git] / arch / powerpc / mm / pgtable-hash64.c

diff --git a/arch/powerpc/mm/pgtable-hash64.c b/arch/powerpc/mm/pgtable-hash64.c
index ec277913e01b4e06b1034531818b96c253004863..469808e77e58b271e716d54241a016cb711f0836 100644 (file)
--- a/arch/powerpc/mm/pgtable-hash64.c
+++ b/arch/powerpc/mm/pgtable-hash64.c
@@ -296,28 +296,6 @@ pgtable_t hash__pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
        return pgtable;
 }
 
-void hash__pmdp_huge_split_prepare(struct vm_area_struct *vma,
-                              unsigned long address, pmd_t *pmdp)
-{
-       VM_BUG_ON(address & ~HPAGE_PMD_MASK);
-       VM_BUG_ON(REGION_ID(address) != USER_REGION_ID);
-       VM_BUG_ON(pmd_devmap(*pmdp));
-
-       /*
-        * We can't mark the pmd none here, because that will cause a race
-        * against exit_mmap. We need to continue mark pmd TRANS HUGE, while
-        * we spilt, but at the same time we wan't rest of the ppc64 code
-        * not to insert hash pte on this, because we will be modifying
-        * the deposited pgtable in the caller of this function. Hence
-        * clear the _PAGE_USER so that we move the fault handling to
-        * higher level function and that will serialize against ptl.
-        * We need to flush existing hash pte entries here even though,
-        * the translation is still valid, because we will withdraw
-        * pgtable_t after this.
-        */
-       pmd_hugepage_update(vma->vm_mm, address, pmdp, 0, _PAGE_PRIVILEGED);
-}
-
 /*
  * A linux hugepage PMD was changed and the corresponding hash table entries
  * neesd to be flushed.