Add min_heap_peek() function to retrieve a pointer to the smallest element. The pointer is cast to the appropriate type of heap elements.
Signed-off-by: Kuan-Wei Chiu <[email protected]> Reviewed-by: Ian Rogers <[email protected]> --- include/linux/min_heap.h | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/include/linux/min_heap.h b/include/linux/min_heap.h index ed462f194b88..7c1fd1ddc71a 100644 --- a/include/linux/min_heap.h +++ b/include/linux/min_heap.h @@ -56,6 +56,16 @@ void __min_heap_init(struct __min_heap *heap, void *data, int size) #define min_heap_init(_heap, _data, _size) \ __min_heap_init(&(_heap)->heap, _data, _size) +/* Get the minimum element from the heap. */ +static __always_inline +void *__min_heap_peek(struct __min_heap *heap) +{ + return heap->nr ? heap->data : NULL; +} + +#define min_heap_peek(_heap) \ + (__minheap_cast(_heap) __min_heap_peek(&(_heap)->heap)) + /* Sift the element at pos down the heap. */ static __always_inline void __min_heapify(struct __min_heap *heap, int pos, size_t elem_size, -- 2.34.1
