Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64...

[firefly-linux-kernel-4.4.55.git] / drivers / usb / gadget / u_f.h

diff --git a/drivers/usb/gadget/u_f.h b/drivers/usb/gadget/u_f.h
index 71034c061fca864790ce5949433c7d88c8deb0c1..1d5f0eb685521c3a3ce6942571b78413161c54ef 100644 (file)
--- a/drivers/usb/gadget/u_f.h
+++ b/drivers/usb/gadget/u_f.h
@@ -16,6 +16,32 @@
 #ifndef __U_F_H__
 #define __U_F_H__
 
+/* Variable Length Array Macros **********************************************/
+#define vla_group(groupname) size_t groupname##__next = 0
+#define vla_group_size(groupname) groupname##__next
+
+#define vla_item(groupname, type, name, n) \
+       size_t groupname##_##name##__offset = ({                               \
+               size_t align_mask = __alignof__(type) - 1;                     \
+               size_t offset = (groupname##__next + align_mask) & ~align_mask;\
+               size_t size = (n) * sizeof(type);                              \
+               groupname##__next = offset + size;                             \
+               offset;                                                        \
+       })
+
+#define vla_item_with_sz(groupname, type, name, n) \
+       size_t groupname##_##name##__sz = (n) * sizeof(type);                  \
+       size_t groupname##_##name##__offset = ({                               \
+               size_t align_mask = __alignof__(type) - 1;                     \
+               size_t offset = (groupname##__next + align_mask) & ~align_mask;\
+               size_t size = groupname##_##name##__sz;                        \
+               groupname##__next = offset + size;                             \
+               offset;                                                        \
+       })
+
+#define vla_ptr(ptr, groupname, name) \
+       ((void *) ((char *)ptr + groupname##_##name##__offset))
+
 struct usb_ep;
 struct usb_request;