mirror of
https://github.com/torvalds/linux.git
synced 2024-11-11 22:51:42 +00:00
74d4846697
Variable Length Array macros allow portable (compilable with both gcc and clang) way of allocating a number of structures using a single memory chunk. They can be useful for files other than f_fs.c, so move them to a header file. Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com> Acked-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
53 lines
1.6 KiB
C
53 lines
1.6 KiB
C
/*
|
|
* u_f.h
|
|
*
|
|
* Utility definitions for USB functions
|
|
*
|
|
* Copyright (c) 2013 Samsung Electronics Co., Ltd.
|
|
* http://www.samsung.com
|
|
*
|
|
* Author: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#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;
|
|
|
|
struct usb_request *alloc_ep_req(struct usb_ep *ep, int len, int default_len);
|
|
|
|
#endif /* __U_F_H__ */
|
|
|
|
|