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List:       linux-bcache
Subject:    [RESEND PATCH v5 06/16] lib min_heap: Add min_heap_peek()
From:       Kuan-Wei Chiu <visitorckw () gmail ! com>
Date:       2024-05-14 8:47:14
Message-ID: 20240514084724.557100-7-visitorckw () gmail ! com
[Download RAW message or body]

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@gmail.com>
Reviewed-by: Ian Rogers <irogers@google.com>
---
 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


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