X-Git-Url: https://bbs.cooldavid.org/git/?a=blobdiff_plain;f=mm%2Futil.c;h=73dac81e9f782be7c58407b1f14a9bbb214b543e;hb=24b7ea9f6c9787fad885442ed0cc010f1aa69cca;hp=4735ea48181680405531a91ffc200b57035a5738;hpb=70c74e59db7450d5c9164abeb3b6752f8045288b;p=net-next-2.6.git

diff --git a/mm/util.c b/mm/util.c
index 4735ea48181..73dac81e9f7 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