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container_of: apply typeof_member() to container_of()

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container_of() uses the construct below:

	((type *)0)->member

to retrieve the type of the structure's member and then ensure that it
matches the type of the given pointer.

This construct being rather difficult to understand, the typeof_member()
macro was created to encapsulate it and give it a descriptive name.

Apply typeof_member() to container_of() to make it easier to read and
understand what this macro does.

Signed-off-by: Vincent Mailhol <mailhol@kernel.org>
Link: https://patch.msgid.link/20260714-containerof_refactor-v1-1-b5c31164d2ad@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vincent Mailhol
2026-07-14 20:18:01 +02:00
committed by Greg Kroah-Hartman
parent a10639966f
commit f810b41def
1 changed files with 1 additions and 1 deletions
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2
include/linux/container_of.h
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@@ -18,7 +18,7 @@
*/
#define container_of(ptr, type, member) ({ \
void *__mptr = (void *)(ptr); \
static_assert(__same_type(*(ptr), ((type *)0)->member) || \
static_assert(__same_type(*(ptr), typeof_member(type, member)) || \
__same_type(*(ptr), void), \
"pointer type mismatch in container_of()"); \
((type *)(__mptr - offsetof(type, member))); })