x86: add tizen_qemu_x86_defconfig & tizen_qemu_x86_64_defconfig

[platform/kernel/linux-rpi.git] / mm / mremap.c

diff --git a/mm/mremap.c b/mm/mremap.c
index badfe17..3a3cf4c 100644 (file)
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -486,6 +486,9 @@ unsigned long move_page_tables(struct vm_area_struct *vma,
        pmd_t *old_pmd, *new_pmd;
        pud_t *old_pud, *new_pud;
 
+       if (!len)
+               return 0;
+
        old_end = old_addr + len;
        flush_cache_range(vma, old_addr, old_end);