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f43775625e
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")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Rob Herring <robh@kernel.org>
172 lines
5.7 KiB
C
172 lines
5.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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#ifndef _LINUX_OF_PRIVATE_H
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#define _LINUX_OF_PRIVATE_H
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/*
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* Private symbols used by OF support code
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*
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* Paul Mackerras August 1996.
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* Copyright (C) 1996-2005 Paul Mackerras.
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*/
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/**
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* struct alias_prop - Alias property in 'aliases' node
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* @link: List node to link the structure in aliases_lookup list
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* @alias: Alias property name
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* @np: Pointer to device_node that the alias stands for
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* @id: Index value from end of alias name
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* @stem: Alias string without the index
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*
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* The structure represents one alias property of 'aliases' node as
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* an entry in aliases_lookup list.
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*/
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struct alias_prop {
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struct list_head link;
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const char *alias;
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struct device_node *np;
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int id;
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char stem[];
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};
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#if defined(CONFIG_SPARC)
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#define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 2
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#else
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#define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 1
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#endif
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#define OF_ROOT_NODE_SIZE_CELLS_DEFAULT 1
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extern struct mutex of_mutex;
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extern struct list_head aliases_lookup;
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extern struct kset *of_kset;
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#if defined(CONFIG_OF_DYNAMIC)
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extern int of_property_notify(int action, struct device_node *np,
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struct property *prop, struct property *old_prop);
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extern void of_node_release(struct kobject *kobj);
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extern int __of_changeset_apply_entries(struct of_changeset *ocs,
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int *ret_revert);
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extern int __of_changeset_apply_notify(struct of_changeset *ocs);
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extern int __of_changeset_revert_entries(struct of_changeset *ocs,
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int *ret_apply);
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extern int __of_changeset_revert_notify(struct of_changeset *ocs);
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#else /* CONFIG_OF_DYNAMIC */
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static inline int of_property_notify(int action, struct device_node *np,
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struct property *prop, struct property *old_prop)
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{
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return 0;
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}
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#endif /* CONFIG_OF_DYNAMIC */
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#if defined(CONFIG_OF_KOBJ)
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int of_node_is_attached(struct device_node *node);
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int __of_add_property_sysfs(struct device_node *np, struct property *pp);
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void __of_remove_property_sysfs(struct device_node *np, struct property *prop);
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void __of_update_property_sysfs(struct device_node *np, struct property *newprop,
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struct property *oldprop);
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int __of_attach_node_sysfs(struct device_node *np);
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void __of_detach_node_sysfs(struct device_node *np);
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#else
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static inline int __of_add_property_sysfs(struct device_node *np, struct property *pp)
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{
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return 0;
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}
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static inline void __of_remove_property_sysfs(struct device_node *np, struct property *prop) {}
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static inline void __of_update_property_sysfs(struct device_node *np,
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struct property *newprop, struct property *oldprop) {}
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static inline int __of_attach_node_sysfs(struct device_node *np)
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{
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return 0;
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}
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static inline void __of_detach_node_sysfs(struct device_node *np) {}
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#endif
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#if defined(CONFIG_OF_RESOLVE)
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int of_resolve_phandles(struct device_node *tree);
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#endif
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void __of_phandle_cache_inv_entry(phandle handle);
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#if defined(CONFIG_OF_OVERLAY)
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void of_overlay_mutex_lock(void);
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void of_overlay_mutex_unlock(void);
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#else
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static inline void of_overlay_mutex_lock(void) {};
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static inline void of_overlay_mutex_unlock(void) {};
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#endif
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#if defined(CONFIG_OF_UNITTEST) && defined(CONFIG_OF_OVERLAY)
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extern void __init unittest_unflatten_overlay_base(void);
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#else
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static inline void unittest_unflatten_overlay_base(void) {};
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#endif
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extern void *__unflatten_device_tree(const void *blob,
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struct device_node *dad,
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struct device_node **mynodes,
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void *(*dt_alloc)(u64 size, u64 align),
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bool detached);
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/**
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* General utilities for working with live trees.
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*
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* All functions with two leading underscores operate
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* without taking node references, so you either have to
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* own the devtree lock or work on detached trees only.
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*/
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struct property *__of_prop_dup(const struct property *prop, gfp_t allocflags);
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struct device_node *__of_node_dup(const struct device_node *np,
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const char *full_name);
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struct device_node *__of_find_node_by_path(struct device_node *parent,
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const char *path);
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struct device_node *__of_find_node_by_full_path(struct device_node *node,
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const char *path);
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extern const void *__of_get_property(const struct device_node *np,
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const char *name, int *lenp);
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extern int __of_add_property(struct device_node *np, struct property *prop);
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extern int __of_add_property_sysfs(struct device_node *np,
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struct property *prop);
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extern int __of_remove_property(struct device_node *np, struct property *prop);
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extern void __of_remove_property_sysfs(struct device_node *np,
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struct property *prop);
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extern int __of_update_property(struct device_node *np,
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struct property *newprop, struct property **oldprop);
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extern void __of_update_property_sysfs(struct device_node *np,
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struct property *newprop, struct property *oldprop);
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extern int __of_attach_node_sysfs(struct device_node *np);
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extern void __of_detach_node(struct device_node *np);
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extern void __of_detach_node_sysfs(struct device_node *np);
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extern void __of_sysfs_remove_bin_file(struct device_node *np,
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struct property *prop);
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/* illegal phandle value (set when unresolved) */
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#define OF_PHANDLE_ILLEGAL 0xdeadbeef
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/* iterators for transactions, used for overlays */
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/* forward iterator */
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#define for_each_transaction_entry(_oft, _te) \
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list_for_each_entry(_te, &(_oft)->te_list, node)
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/* reverse iterator */
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#define for_each_transaction_entry_reverse(_oft, _te) \
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list_for_each_entry_reverse(_te, &(_oft)->te_list, node)
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extern int of_bus_n_addr_cells(struct device_node *np);
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extern int of_bus_n_size_cells(struct device_node *np);
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#ifdef CONFIG_OF_ADDRESS
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extern int of_dma_get_range(struct device_node *np, u64 *dma_addr,
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u64 *paddr, u64 *size);
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#else
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static inline int of_dma_get_range(struct device_node *np, u64 *dma_addr,
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u64 *paddr, u64 *size)
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{
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return -ENODEV;
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}
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#endif
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#endif /* _LINUX_OF_PRIVATE_H */
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