forked from Minki/linux
5b361328ca
The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:
struct foo {
int stuff;
struct boo array[];
};
By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.
Also, notice that, dynamic memory allocations won't be affected by
this change:
"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]
This issue was found with the help of Coccinelle.
[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 7649773293 ("cxgb3/l2t: Fix undefined behaviour")
Link: https://lore.kernel.org/r/20200213010425.GA13068@embeddedor.com
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> # added a few more
96 lines
3.0 KiB
C
96 lines
3.0 KiB
C
/*
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* Copyright (c) 2013, Cisco Systems, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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#ifndef USNIC_UIOM_H_
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#define USNIC_UIOM_H_
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#include <linux/list.h>
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#include <linux/scatterlist.h>
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#include "usnic_uiom_interval_tree.h"
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struct ib_ucontext;
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#define USNIC_UIOM_READ (1)
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#define USNIC_UIOM_WRITE (2)
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#define USNIC_UIOM_MAX_PD_CNT (1000)
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#define USNIC_UIOM_MAX_MR_CNT (1000000)
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#define USNIC_UIOM_MAX_MR_SIZE (~0UL)
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#define USNIC_UIOM_PAGE_SIZE (PAGE_SIZE)
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struct usnic_uiom_dev {
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struct device *dev;
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struct list_head link;
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};
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struct usnic_uiom_pd {
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struct iommu_domain *domain;
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spinlock_t lock;
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struct rb_root_cached root;
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struct list_head devs;
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int dev_cnt;
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};
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struct usnic_uiom_reg {
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struct usnic_uiom_pd *pd;
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unsigned long va;
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size_t length;
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int offset;
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int page_size;
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int writable;
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struct list_head chunk_list;
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struct work_struct work;
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struct mm_struct *owning_mm;
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};
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struct usnic_uiom_chunk {
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struct list_head list;
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int nents;
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struct scatterlist page_list[];
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};
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struct usnic_uiom_pd *usnic_uiom_alloc_pd(void);
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void usnic_uiom_dealloc_pd(struct usnic_uiom_pd *pd);
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int usnic_uiom_attach_dev_to_pd(struct usnic_uiom_pd *pd, struct device *dev);
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void usnic_uiom_detach_dev_from_pd(struct usnic_uiom_pd *pd,
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struct device *dev);
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struct device **usnic_uiom_get_dev_list(struct usnic_uiom_pd *pd);
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void usnic_uiom_free_dev_list(struct device **devs);
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struct usnic_uiom_reg *usnic_uiom_reg_get(struct usnic_uiom_pd *pd,
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unsigned long addr, size_t size,
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int access, int dmasync);
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void usnic_uiom_reg_release(struct usnic_uiom_reg *uiomr);
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int usnic_uiom_init(char *drv_name);
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#endif /* USNIC_UIOM_H_ */
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