#define FOLL_PIN 0x40000 /* pages must be released via unpin_user_page */
#define FOLL_FAST_ONLY 0x80000 /* gup_fast: prevent fall-back to slow gup */
#define FOLL_PCI_P2PDMA 0x100000 /* allow returning PCI P2PDMA pages */
+#define FOLL_INTERRUPTIBLE 0x200000 /* allow interrupts from generic signals */
/*
* FOLL_PIN and FOLL_LONGTERM may be used in various combinations with each