drm/vc4: Add DSI driver

[mirror_ubuntu-zesty-kernel.git] / mm / gup.c

diff --git a/mm/gup.c b/mm/gup.c
index e50178c58b9707398efeae7c9ba66704d69ef9eb..bdd74b782b6e15a5e603b965d860a2842e039812 100644 (file)
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -265,8 +265,6 @@ struct page *follow_page_mask(struct vm_area_struct *vma,
                        return page;
                return no_page_table(vma, flags);
        }
-       if ((flags & FOLL_NUMA) && pmd_protnone(*pmd))
-               return no_page_table(vma, flags);
        if (pmd_devmap(*pmd)) {
                ptl = pmd_lock(mm, pmd);
                page = follow_devmap_pmd(vma, address, pmd, flags);
@@ -277,6 +275,9 @@ struct page *follow_page_mask(struct vm_area_struct *vma,
        if (likely(!pmd_trans_huge(*pmd)))
                return follow_page_pte(vma, address, pmd, flags);
 
+       if ((flags & FOLL_NUMA) && pmd_protnone(*pmd))
+               return no_page_table(vma, flags);
+
        ptl = pmd_lock(mm, pmd);
        if (unlikely(!pmd_trans_huge(*pmd))) {
                spin_unlock(ptl);
@@ -370,11 +371,6 @@ static int faultin_page(struct task_struct *tsk, struct vm_area_struct *vma,
        /* mlock all present pages, but do not fault in new pages */
        if ((*flags & (FOLL_POPULATE | FOLL_MLOCK)) == FOLL_MLOCK)
                return -ENOENT;
-       /* For mm_populate(), just skip the stack guard page. */
-       if ((*flags & FOLL_POPULATE) &&
-                       (stack_guard_page_start(vma, address) ||
-                        stack_guard_page_end(vma, address + PAGE_SIZE)))
-               return -ENOENT;
        if (*flags & FOLL_WRITE)
                fault_flags |= FAULT_FLAG_WRITE;
        if (*flags & FOLL_REMOTE)
@@ -865,9 +861,10 @@ EXPORT_SYMBOL(get_user_pages_locked);
  * caller if required (just like with __get_user_pages). "FOLL_GET"
  * is set implicitly if "pages" is non-NULL.
  */
-__always_inline long __get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm,
-                                              unsigned long start, unsigned long nr_pages,
-                                              struct page **pages, unsigned int gup_flags)
+static __always_inline long __get_user_pages_unlocked(struct task_struct *tsk,
+               struct mm_struct *mm, unsigned long start,
+               unsigned long nr_pages, struct page **pages,
+               unsigned int gup_flags)
 {
        long ret;
        int locked = 1;
@@ -879,7 +876,6 @@ __always_inline long __get_user_pages_unlocked(struct task_struct *tsk, struct m
                up_read(&mm->mmap_sem);
        return ret;
 }
-EXPORT_SYMBOL(__get_user_pages_unlocked);
 
 /*
  * get_user_pages_unlocked() is suitable to replace the form:
@@ -917,6 +913,9 @@ EXPORT_SYMBOL(get_user_pages_unlocked);
  *             only intends to ensure the pages are faulted in.
  * @vmas:      array of pointers to vmas corresponding to each page.
  *             Or NULL if the caller does not require them.
+ * @locked:    pointer to lock flag indicating whether lock is held and
+ *             subsequently whether VM_FAULT_RETRY functionality can be
+ *             utilised. Lock must initially be held.
  *
  * Returns number of pages pinned. This may be fewer than the number
  * requested. If nr_pages is 0 or negative, returns 0. If no pages
@@ -960,10 +959,10 @@ EXPORT_SYMBOL(get_user_pages_unlocked);
 long get_user_pages_remote(struct task_struct *tsk, struct mm_struct *mm,
                unsigned long start, unsigned long nr_pages,
                unsigned int gup_flags, struct page **pages,
-               struct vm_area_struct **vmas)
+               struct vm_area_struct **vmas, int *locked)
 {
        return __get_user_pages_locked(tsk, mm, start, nr_pages, pages, vmas,
-                                      NULL, false,
+                                      locked, true,
                                       gup_flags | FOLL_TOUCH | FOLL_REMOTE);
 }
 EXPORT_SYMBOL(get_user_pages_remote);
@@ -971,8 +970,9 @@ EXPORT_SYMBOL(get_user_pages_remote);
 /*
  * This is the same as get_user_pages_remote(), just with a
  * less-flexible calling convention where we assume that the task
- * and mm being operated on are the current task's.  We also
- * obviously don't pass FOLL_REMOTE in here.
+ * and mm being operated on are the current task's and don't allow
+ * passing of a locked parameter.  We also obviously don't pass
+ * FOLL_REMOTE in here.
  */
 long get_user_pages(unsigned long start, unsigned long nr_pages,
                unsigned int gup_flags, struct page **pages,