SUNRPC: Count ingress RPC messages per svc_pool

[linux-2.6-microblaze.git] / include / linux / mm.h

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 406ab9e..34f9dba 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -3421,15 +3421,24 @@ static inline int vm_fault_to_errno(vm_fault_t vm_fault, int foll_flags)
  * Indicates whether GUP can follow a PROT_NONE mapped page, or whether
  * a (NUMA hinting) fault is required.
  */
-static inline bool gup_can_follow_protnone(unsigned int flags)
+static inline bool gup_can_follow_protnone(struct vm_area_struct *vma,
+                                          unsigned int flags)
 {
        /*
-        * FOLL_FORCE has to be able to make progress even if the VMA is
-        * inaccessible. Further, FOLL_FORCE access usually does not represent
-        * application behaviour and we should avoid triggering NUMA hinting
-        * faults.
+        * If callers don't want to honor NUMA hinting faults, no need to
+        * determine if we would actually have to trigger a NUMA hinting fault.
         */
-       return flags & FOLL_FORCE;
+       if (!(flags & FOLL_HONOR_NUMA_FAULT))
+               return true;
+
+       /*
+        * NUMA hinting faults don't apply in inaccessible (PROT_NONE) VMAs.
+        *
+        * Requiring a fault here even for inaccessible VMAs would mean that
+        * FOLL_FORCE cannot make any progress, because handle_mm_fault()
+        * refuses to process NUMA hinting faults in inaccessible VMAs.
+        */
+       return !vma_is_accessible(vma);
 }
 
 typedef int (*pte_fn_t)(pte_t *pte, unsigned long addr, void *data);