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-rw-r--r--mm/util.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/mm/util.c b/mm/util.c
index 4735ea481816..73dac81e9f78 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -245,6 +245,19 @@ void arch_pick_mmap_layout(struct mm_struct *mm)
}
#endif
+/*
+ * Like get_user_pages_fast() except its IRQ-safe in that it won't fall
+ * back to the regular GUP.
+ * If the architecture not support this fucntion, simply return with no
+ * page pinned
+ */
+int __attribute__((weak)) __get_user_pages_fast(unsigned long start,
+ int nr_pages, int write, struct page **pages)
+{
+ return 0;
+}
+EXPORT_SYMBOL_GPL(__get_user_pages_fast);
+
/**
* get_user_pages_fast() - pin user pages in memory
* @start: starting user address