Received-SPF: pass (google.com: domain of linux-kernel+bounces-109042-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:40f1:3f00::1 as permitted sender) client-ip=2604:1380:40f1:3f00::1;
From: Kuan-Wei Chiu <visitorckw@gmail.com>
To: colyli@suse.de,
	kent.overstreet@linux.dev,
	msakai@redhat.com,
	peterz@infradead.org,
	mingo@redhat.com,
	acme@kernel.org,
	namhyung@kernel.org,
	akpm@linux-foundation.org
Cc: bfoster@redhat.com,
	mark.rutland@arm.com,
	alexander.shishkin@linux.intel.com,
	jolsa@kernel.org,
	irogers@google.com,
	adrian.hunter@intel.com,
	jserv@ccns.ncku.edu.tw,
	dm-devel@lists.linux.dev,
	linux-bcache@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	linux-bcachefs@vger.kernel.org,
	linux-perf-users@vger.kernel.org,
	Kuan-Wei Chiu <visitorckw@gmail.com>
Subject: [PATCH v2 08/15] lib min_heap: Add min_heap_del()
Date: Wed, 20 Mar 2024 22:54:10 +0800
Message-Id: <20240320145417.336208-9-visitorckw@gmail.com>
In-Reply-To: <20240320145417.336208-1-visitorckw@gmail.com>
References: <20240320145417.336208-1-visitorckw@gmail.com>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

Add min_heap_del() to delete the element at index 'idx' in the heap.

Signed-off-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Reviewed-by: Ian Rogers <irogers@google.com>
---
 include/linux/min_heap.h | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/include/linux/min_heap.h b/include/linux/min_heap.h
index b1d874f4d536..36023e0be232 100644
--- a/include/linux/min_heap.h
+++ b/include/linux/min_heap.h
@@ -194,4 +194,28 @@ void __min_heap_push(struct __min_heap *heap, const void *element, size_t elem_s
 #define min_heap_push(_heap, _element, _func)	\
 	__min_heap_push(&(_heap)->heap, _element, __minheap_obj_size(_heap), _func)
 
+/* Remove ith element from the heap, O(log2(nr)). */
+static __always_inline
+bool __min_heap_del(struct __min_heap *heap, size_t elem_size, size_t idx,
+		const struct min_heap_callbacks *func, void *args)
+{
+	void *data = heap->data;
+
+	if (WARN_ONCE(heap->nr <= 0, "Popping an empty heap"))
+		return false;
+
+	/* Place last element at the root (position 0) and then sift down. */
+	heap->nr--;
+	if (idx == heap->nr)
+		return true;
+	memcpy(data, data + (heap->nr * elem_size), elem_size);
+	__min_heap_sift_up(heap, elem_size, idx, func, args);
+	__min_heapify(heap, idx, elem_size, func, args);
+
+	return true;
+}
+
+#define min_heap_del(_heap, _idx, _func, _args)	\
+	__min_heap_del(&(_heap)->heap, __minheap_obj_size(_heap), _idx, _func, _args)
+
 #endif /* _LINUX_MIN_HEAP_H */
-- 
2.34.1