sys/prctl.h: add PR_{SET,GET}_IO_FLUSHER from linux v5.6

needed for storage drivers with userspace component that may
run in the IO path, see

  linux commit 8d19f1c8e1937baf74e1962aae9f90fa3aeab463
  prctl: PR_{G,S}ET_IO_FLUSHER to support controlling memory reclaim

diff --git a/include/sys/prctl.h b/include/sys/prctl.h
index d9c846e..4b9fcc0 100644 (file)
--- a/include/sys/prctl.h
+++ b/include/sys/prctl.h
@@ -158,6 +158,9 @@ struct prctl_mm_map {
 #define PR_GET_TAGGED_ADDR_CTRL 56
 #define PR_TAGGED_ADDR_ENABLE (1UL << 0)
 
+#define PR_SET_IO_FLUSHER 57
+#define PR_GET_IO_FLUSHER 58
+
 int prctl (int, ...);
 
 #ifdef __cplusplus