virtio: fix the bar starting index

[vpp.git] / src / vppinfra / clib.h

diff --git a/src/vppinfra/clib.h b/src/vppinfra/clib.h
index 398f1ae..6c82f86 100644 (file)
--- a/src/vppinfra/clib.h
+++ b/src/vppinfra/clib.h
@@ -38,6 +38,7 @@
 #ifndef included_clib_h
 #define included_clib_h
 
+#include <stddef.h>
 #include <vppinfra/config.h>
 
 #ifdef  __x86_64__
@@ -66,8 +67,8 @@
 #define ARRAY_LEN(x)   (sizeof (x)/sizeof (x[0]))
 
 #define _STRUCT_FIELD(t,f) (((t *) 0)->f)
-#define STRUCT_OFFSET_OF(t,f) ((uword) & _STRUCT_FIELD (t, f))
-#define STRUCT_BIT_OFFSET_OF(t,f) (BITS(u8) * (uword) & _STRUCT_FIELD (t, f))
+#define STRUCT_OFFSET_OF(t,f) offsetof(t, f)
+#define STRUCT_BIT_OFFSET_OF(t,f) (BITS(u8) * STRUCT_OFFSET_OF (t, f))
 #define STRUCT_SIZE_OF(t,f)   (sizeof (_STRUCT_FIELD (t, f)))
 #define STRUCT_BITS_OF(t,f)   (BITS (_STRUCT_FIELD (t, f)))
 #define STRUCT_ARRAY_LEN(t,f) ARRAY_LEN (_STRUCT_FIELD (t, f))
@@ -98,6 +99,7 @@
 #define __clib_noinline __attribute__ ((noinline))
 #define __clib_aligned(x) __attribute__ ((aligned(x)))
 #define __clib_section(s) __attribute__ ((section(s)))
+#define __clib_warn_unused_result __attribute__ ((warn_unused_result))
 
 #define never_inline __attribute__ ((__noinline__))
 
@@ -252,6 +254,12 @@ is_pow2 (uword x)
   return 0 == (x & (x - 1));
 }
 
+always_inline uword
+round_down_pow2 (uword x, uword pow2)
+{
+  return (x) & ~(pow2 - 1);
+}
+
 always_inline uword
 round_pow2 (uword x, uword pow2)
 {