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usb: gadget: FunctionFS: share VLA macros with all usb gadget files

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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>
This commit is contained in:
Andrzej Pietrasiewicz 2014-05-08 14:06:21 +02:00 committed by Felipe Balbi
parent 10f0577aa5
commit 74d4846697
2 changed files with 27 additions and 26 deletions
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27
drivers/usb/gadget/f_fs.c
View File

@ -33,36 +33,11 @@
#include <linux/poll.h>
#include "u_fs.h"
#include "u_f.h"
#include "configfs.h"
#define FUNCTIONFS_MAGIC 0xa647361 /* Chosen by a honest dice roll ;) */
/* 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))
/* Reference counter handling */
static void ffs_data_get(struct ffs_data *ffs);
static void ffs_data_put(struct ffs_data *ffs);

26
drivers/usb/gadget/u_f.h
View File

@ -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;