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40 lines
1.4 KiB
40 lines
1.4 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_CONTAINER_OF_H |
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#define _LINUX_CONTAINER_OF_H |
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#include <linux/build_bug.h> |
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#include <linux/err.h> |
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#define typeof_member(T, m) typeof(((T*)0)->m) |
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/** |
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* container_of - cast a member of a structure out to the containing structure |
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* @ptr: the pointer to the member. |
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* @type: the type of the container struct this is embedded in. |
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* @member: the name of the member within the struct. |
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* |
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*/ |
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#define container_of(ptr, type, member) ({ \ |
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void *__mptr = (void *)(ptr); \ |
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static_assert(__same_type(*(ptr), ((type *)0)->member) || \ |
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__same_type(*(ptr), void), \ |
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"pointer type mismatch in container_of()"); \ |
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((type *)(__mptr - offsetof(type, member))); }) |
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/** |
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* container_of_safe - cast a member of a structure out to the containing structure |
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* @ptr: the pointer to the member. |
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* @type: the type of the container struct this is embedded in. |
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* @member: the name of the member within the struct. |
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* |
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* If IS_ERR_OR_NULL(ptr), ptr is returned unchanged. |
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*/ |
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#define container_of_safe(ptr, type, member) ({ \ |
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void *__mptr = (void *)(ptr); \ |
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static_assert(__same_type(*(ptr), ((type *)0)->member) || \ |
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__same_type(*(ptr), void), \ |
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"pointer type mismatch in container_of_safe()"); \ |
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IS_ERR_OR_NULL(__mptr) ? ERR_CAST(__mptr) : \ |
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((type *)(__mptr - offsetof(type, member))); }) |
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#endif /* _LINUX_CONTAINER_OF_H */
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