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 <visitorckw@xxxxxxxxx>
Reviewed-by: Ian Rogers <irogers@xxxxxxxxxx>
---
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 f6b07fb8b2d3..043de539bf71 100644
--- a/include/linux/min_heap.h
+++ b/include/linux/min_heap.h
@@ -53,6 +53,16 @@ void __min_heap_init(min_heap_char *heap, void *data, int size)
#define min_heap_init(_heap, _data, _size) \
__min_heap_init((min_heap_char *)_heap, _data, _size)
+/* Get the minimum element from the heap. */
+static __always_inline
+void *__min_heap_peek(struct min_heap_char *heap)
+{
+ return heap->nr ? heap->data : NULL;
+}
+
+#define min_heap_peek(_heap) \
+ (__minheap_cast(_heap) __min_heap_peek((min_heap_char *)_heap))
+
/* Sift the element at pos down the heap. */
static __always_inline
void __min_heapify(min_heap_char *heap, int pos, size_t elem_size,
--
2.34.1
