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kernel/os: Check if CONTAINER_OF is already defined #3653

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kernel/os: Check if CONTAINER_OF is already defined #3653

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2 changes: 2 additions & 0 deletions kernel/os/include/os/util.h
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Original file line number Diff line number Diff line change
Expand Up @@ -27,8 +27,10 @@
#define INT_TO_POINTER(u) ((void *) ((intptr_t) (u)))

/* Helper to retrieve pointer to "parent" object in structure */
#ifndef CONTAINER_OF
#define CONTAINER_OF(ptr, type, field) \
((type *)(((char *)(ptr)) - offsetof(type, field)))
#endif

/* Helper to calculate number of elements in array */
#ifndef ARRAY_SIZE
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