linux-kernel - [PATCH v3 05/17] lib min_heap: Add min_heap

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Message-Id: <20240406164727.577914-6-visitorckw@gmail.com>
Date: Sun,  7 Apr 2024 00:47:15 +0800
From: Kuan-Wei Chiu <visitorckw@...il.com>
To: colyli@...e.de,
	kent.overstreet@...ux.dev,
	msakai@...hat.com,
	peterz@...radead.org,
	mingo@...hat.com,
	acme@...nel.org,
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	akpm@...ux-foundation.org
Cc: bfoster@...hat.com,
	mark.rutland@....com,
	alexander.shishkin@...ux.intel.com,
	jolsa@...nel.org,
	irogers@...gle.com,
	adrian.hunter@...el.com,
	jserv@...s.ncku.edu.tw,
	linux-bcache@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	dm-devel@...ts.linux.dev,
	linux-bcachefs@...r.kernel.org,
	linux-perf-users@...r.kernel.org,
	Kuan-Wei Chiu <visitorckw@...il.com>
Subject: [PATCH v3 05/17] lib min_heap: Add min_heap_init()

Add min_heap_init() for initializing heap with data, nr, and size.

Signed-off-by: Kuan-Wei Chiu <visitorckw@...il.com>
Reviewed-by: Ian Rogers <irogers@...gle.com>
---
Changes in v3:
- If the 'data' parameter is NULL, we now make the data pointer in the
  heap point to the preallocated.

 include/linux/min_heap.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/include/linux/min_heap.h b/include/linux/min_heap.h
index 87737cadb9a5..f6b07fb8b2d3 100644
--- a/include/linux/min_heap.h
+++ b/include/linux/min_heap.h
@@ -38,6 +38,21 @@ struct min_heap_callbacks {
 	void (*swp)(void *lhs, void *rhs);
 };
 
+/* Initialize a min-heap. */
+static __always_inline
+void __min_heap_init(min_heap_char *heap, void *data, int size)
+{
+	heap->nr = 0;
+	heap->size = size;
+	if (data)
+		heap->data = data;
+	else
+		heap->data = heap->preallocated;
+}
+
+#define min_heap_init(_heap, _data, _size)	\
+	__min_heap_init((min_heap_char *)_heap, _data, _size)
+
 /* 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