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 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
