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-rw-r--r--mm/memory.c47
1 files changed, 20 insertions, 27 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 7d23b50..9f2c15c 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3008,13 +3008,6 @@ static int do_set_pmd(struct vm_fault *vmf, struct page *page)
ret = 0;
count_vm_event(THP_FILE_MAPPED);
out:
- /*
- * If we are going to fallback to pte mapping, do a
- * withdraw with pmd lock held.
- */
- if (arch_needs_pgtable_deposit() && ret == VM_FAULT_FALLBACK)
- vmf->prealloc_pte = pgtable_trans_huge_withdraw(vma->vm_mm,
- vmf->pmd);
spin_unlock(vmf->ptl);
return ret;
}
@@ -3055,20 +3048,18 @@ int alloc_set_pte(struct vm_fault *vmf, struct mem_cgroup *memcg,
ret = do_set_pmd(vmf, page);
if (ret != VM_FAULT_FALLBACK)
- goto fault_handled;
+ return ret;
}
if (!vmf->pte) {
ret = pte_alloc_one_map(vmf);
if (ret)
- goto fault_handled;
+ return ret;
}
/* Re-check under ptl */
- if (unlikely(!pte_none(*vmf->pte))) {
- ret = VM_FAULT_NOPAGE;
- goto fault_handled;
- }
+ if (unlikely(!pte_none(*vmf->pte)))
+ return VM_FAULT_NOPAGE;
flush_icache_page(vma, page);
entry = mk_pte(page, vma->vm_page_prot);
@@ -3088,15 +3079,8 @@ int alloc_set_pte(struct vm_fault *vmf, struct mem_cgroup *memcg,
/* no need to invalidate: a not-present page won't be cached */
update_mmu_cache(vma, vmf->address, vmf->pte);
- ret = 0;
-fault_handled:
- /* preallocated pagetable is unused: free it */
- if (vmf->prealloc_pte) {
- pte_free(vmf->vma->vm_mm, vmf->prealloc_pte);
- vmf->prealloc_pte = 0;
- }
- return ret;
+ return 0;
}
@@ -3360,15 +3344,24 @@ static int do_shared_fault(struct vm_fault *vmf)
static int do_fault(struct vm_fault *vmf)
{
struct vm_area_struct *vma = vmf->vma;
+ int ret;
/* The VMA was not fully populated on mmap() or missing VM_DONTEXPAND */
if (!vma->vm_ops->fault)
- return VM_FAULT_SIGBUS;
- if (!(vmf->flags & FAULT_FLAG_WRITE))
- return do_read_fault(vmf);
- if (!(vma->vm_flags & VM_SHARED))
- return do_cow_fault(vmf);
- return do_shared_fault(vmf);
+ ret = VM_FAULT_SIGBUS;
+ else if (!(vmf->flags & FAULT_FLAG_WRITE))
+ ret = do_read_fault(vmf);
+ else if (!(vma->vm_flags & VM_SHARED))
+ ret = do_cow_fault(vmf);
+ else
+ ret = do_shared_fault(vmf);
+
+ /* preallocated pagetable is unused: free it */
+ if (vmf->prealloc_pte) {
+ pte_free(vma->vm_mm, vmf->prealloc_pte);
+ vmf->prealloc_pte = 0;
+ }
+ return ret;
}
static int numa_migrate_prep(struct page *page, struct vm_area_struct *vma,
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