When dealing with the speculative fault path we should use the VMA's field
cached value stored in the vm_fault structure.
Currently vm_normal_page() is using the pointer to the VMA to fetch the
vm_flags value. This patch provides a new __vm_normal_page() which is
receiving the vm_flags flags value as parameter.
Note: The speculative path is turned on for architecture providing support
for special PTE flag. So only the first block of vm_normal_page is used
during the speculative path.
Signed-off-by: Laurent Dufour <lduf...@linux.vnet.ibm.com>
---
mm/memory.c | 25 +++++++++++++++++--------
1 file changed, 17 insertions(+), 8 deletions(-)
diff --git a/mm/memory.c b/mm/memory.c
index ad7b6372d302..9f9e5bb7a556 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -820,8 +820,9 @@ static void print_bad_pte(struct vm_area_struct *vma,
unsigned long addr,
#else
# define HAVE_PTE_SPECIAL 0
#endif
-struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
- pte_t pte)
+static struct page *__vm_normal_page(struct vm_area_struct *vma,
+ unsigned long addr,
+ pte_t pte, unsigned long vma_flags)
{
unsigned long pfn = pte_pfn(pte);
@@ -830,7 +831,7 @@ struct page *vm_normal_page(struct vm_area_struct *vma,
unsigned long addr,
goto check_pfn;
if (vma->vm_ops && vma->vm_ops->find_special_page)
return vma->vm_ops->find_special_page(vma, addr);
- if (vma->vm_flags & (VM_PFNMAP | VM_MIXEDMAP))
+ if (vma_flags & (VM_PFNMAP | VM_MIXEDMAP))
return NULL;
if (!is_zero_pfn(pfn))
print_bad_pte(vma, addr, pte, NULL);
@@ -839,8 +840,8 @@ struct page *vm_normal_page(struct vm_area_struct *vma,
unsigned long addr,
/* !HAVE_PTE_SPECIAL case follows: */
- if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) {
- if (vma->vm_flags & VM_MIXEDMAP) {
+ if (unlikely(vma_flags & (VM_PFNMAP|VM_MIXEDMAP))) {
+ if (vma_flags & VM_MIXEDMAP) {
if (!pfn_valid(pfn))
return NULL;
goto out;
@@ -849,7 +850,7 @@ struct page *vm_normal_page(struct vm_area_struct *vma,
unsigned long addr,
off = (addr - vma->vm_start) >> PAGE_SHIFT;
if (pfn == vma->vm_pgoff + off)
return NULL;
- if (!is_cow_mapping(vma->vm_flags))
+ if (!is_cow_mapping(vma_flags))
return NULL;
}
}
@@ -870,6 +871,13 @@ struct page *vm_normal_page(struct vm_area_struct *vma,
unsigned long addr,
return pfn_to_page(pfn);
}
+struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr,
+ pte_t pte)
+{
+ return __vm_normal_page(vma, addr, pte, vma->vm_flags);
+}
+
+
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr,
pmd_t pmd)
@@ -2548,7 +2556,8 @@ static int do_wp_page(struct vm_fault *vmf)
{
struct vm_area_struct *vma = vmf->vma;
- vmf->page = vm_normal_page(vma, vmf->address, vmf->orig_pte);
+ vmf->page = __vm_normal_page(vma, vmf->address, vmf->orig_pte,
+ vmf->vma_flags);
if (!vmf->page) {
/*
* VM_MIXEDMAP !pfn_valid() case, or VM_SOFTDIRTY clear on a
@@ -3575,7 +3584,7 @@ static int do_numa_page(struct vm_fault *vmf)
ptep_modify_prot_commit(vma->vm_mm, vmf->address, vmf->pte, pte);
update_mmu_cache(vma, vmf->address, vmf->pte);
- page = vm_normal_page(vma, vmf->address, pte);
+ page = __vm_normal_page(vma, vmf->address, pte, vmf->vma_flags);
if (!page) {
pte_unmap_unlock(vmf->pte, vmf->ptl);
return 0;
--
2.7.4
