From: Konstantin Khlebnikov <koc...@gmail.com>

Faulting around non-linear page-fault has no sense and
breaks logic in do_fault_around because pgoff is shifted.

Signed-off-by: Konstantin Khlebnikov <koc...@gmail.com>
Reported-by: "Ingo Korb" <ingo.k...@tu-dortmund.de>
---
 mm/memory.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/memory.c b/mm/memory.c
index d67fd9f..7e8d820 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2882,7 +2882,8 @@ static int do_read_fault(struct mm_struct *mm, struct 
vm_area_struct *vma,
         * if page by the offset is not ready to be mapped (cold cache or
         * something).
         */
-       if (vma->vm_ops->map_pages && fault_around_pages() > 1) {
+       if (vma->vm_ops->map_pages && !(flags & FAULT_FLAG_NONLINEAR) &&
+           fault_around_pages() > 1) {
                pte = pte_offset_map_lock(mm, pmd, address, &ptl);
                do_fault_around(vma, address, pte, pgoff, flags);
                if (!pte_same(*pte, orig_pte))

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