forked from luck/tmp_suning_uos_patched
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
/*
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* u_f.h
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*
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* Utility definitions for USB functions
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*
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* Copyright (c) 2013 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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*
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* Author: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __U_F_H__
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#define __U_F_H__
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/* Variable Length Array Macros **********************************************/
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#define vla_group(groupname) size_t groupname##__next = 0
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#define vla_group_size(groupname) groupname##__next
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#define vla_item(groupname, type, name, n) \
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size_t groupname##_##name##__offset = ({ \
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size_t align_mask = __alignof__(type) - 1; \
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size_t offset = (groupname##__next + align_mask) & ~align_mask;\
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size_t size = (n) * sizeof(type); \
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groupname##__next = offset + size; \
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offset; \
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})
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#define vla_item_with_sz(groupname, type, name, n) \
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size_t groupname##_##name##__sz = (n) * sizeof(type); \
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size_t groupname##_##name##__offset = ({ \
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size_t align_mask = __alignof__(type) - 1; \
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size_t offset = (groupname##__next + align_mask) & ~align_mask;\
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size_t size = groupname##_##name##__sz; \
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groupname##__next = offset + size; \
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offset; \
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})
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#define vla_ptr(ptr, groupname, name) \
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((void *) ((char *)ptr + groupname##_##name##__offset))
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struct usb_ep;
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struct usb_request;
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struct usb_request *alloc_ep_req(struct usb_ep *ep, int len, int default_len);
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#endif /* __U_F_H__ */
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