This function is needed by some media driver.
Signed-off-by: Hauke Mehrtens <ha...@hauke-m.de>
---
backport/backport-include/linux/mm.h | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/backport/backport-include/linux/mm.h
b/backport/backport-include/linux/mm.h
index 8671d29..efb2ca7 100644
--- a/backport/backport-include/linux/mm.h
+++ b/backport/backport-include/linux/mm.h
@@ -25,4 +25,21 @@
int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned
long len);
#endif
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(3,20,0))
+#define get_user_pages_unlocked LINUX_BACKPORT(get_user_pages_unlocked)
+static inline long
+get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm,
+ unsigned long start, unsigned long nr_pages,
+ int write, int force, struct page **pages)
+{
+ long err;
+
+ down_read(&mm->mmap_sem);
+ err = get_user_pages(tsk, mm, start, nr_pages, write, force, pages,
+ NULL);
+ up_read(&mm->mmap_sem);
+
+ return err;
+}
+#endif
#endif /* __BACKPORT_MM_H */
--
1.9.1
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