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(61-227-26-231.dynamic-ip.hinet.net. [61.227.26.231]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cb519aeb69csm6340936a12.20.2026.07.21.10.22.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Jul 2026 10:22:12 -0700 (PDT) From: ColtenOuO To: Kuan-Wei Chiu Cc: ColtenOuO , Andrew Morton , linux-kernel@vger.kernel.org (open list:MIN HEAP) Subject: [PATCH] lib min_heap: add min_heap_empty()/min_heap_empty_inline() Date: Tue, 21 Jul 2026 17:21:08 +0000 Message-ID: <20260721172109.112868-1-jun930436@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Documentation/core-api/min_heap.rst documents min_heap_empty() and min_heap_empty_inline() as part of the Min Heap API, but these functions were never actually implemented. Add them, following the same pattern as the existing min_heap_full()/min_heap_full_inline(). Signed-off-by: ColtenOuO --- include/linux/min_heap.h | 13 +++++++++++++ lib/min_heap.c | 6 ++++++ 2 files changed, 19 insertions(+) diff --git a/include/linux/min_heap.h b/include/linux/min_heap.h index 79ddc0adbf2b..931101c29e1d 100644 --- a/include/linux/min_heap.h +++ b/include/linux/min_heap.h @@ -252,6 +252,16 @@ bool __min_heap_full_inline(min_heap_char *heap) #define min_heap_full_inline(_heap) \ __min_heap_full_inline(container_of(&(_heap)->nr, min_heap_char, nr)) +/* Check if the heap is empty. */ +static __always_inline +bool __min_heap_empty_inline(min_heap_char *heap) +{ + return heap->nr == 0; +} + +#define min_heap_empty_inline(_heap) \ + __min_heap_empty_inline(container_of(&(_heap)->nr, min_heap_char, nr)) + /* Sift the element at pos down the heap. */ static __always_inline void __min_heap_sift_down_inline(min_heap_char *heap, size_t pos, size_t elem_size, @@ -431,6 +441,7 @@ bool __min_heap_del_inline(min_heap_char *heap, size_t elem_size, size_t idx, void __min_heap_init(min_heap_char *heap, void *data, size_t size); void *__min_heap_peek(struct min_heap_char *heap); bool __min_heap_full(min_heap_char *heap); +bool __min_heap_empty(min_heap_char *heap); void __min_heap_sift_down(min_heap_char *heap, size_t pos, size_t elem_size, const struct min_heap_callbacks *func, void *args); void __min_heap_sift_up(min_heap_char *heap, size_t elem_size, size_t idx, @@ -452,6 +463,8 @@ bool __min_heap_del(min_heap_char *heap, size_t elem_size, size_t idx, (__minheap_cast(_heap) __min_heap_peek(container_of(&(_heap)->nr, min_heap_char, nr))) #define min_heap_full(_heap) \ __min_heap_full(container_of(&(_heap)->nr, min_heap_char, nr)) +#define min_heap_empty(_heap) \ + __min_heap_empty(container_of(&(_heap)->nr, min_heap_char, nr)) #define min_heap_sift_down(_heap, _pos, _func, _args) \ __min_heap_sift_down(container_of(&(_heap)->nr, min_heap_char, nr), _pos, \ __minheap_obj_size(_heap), _func, _args) diff --git a/lib/min_heap.c b/lib/min_heap.c index 96f01a4c5fb6..9e3978a78a93 100644 --- a/lib/min_heap.c +++ b/lib/min_heap.c @@ -20,6 +20,12 @@ bool __min_heap_full(min_heap_char *heap) } EXPORT_SYMBOL(__min_heap_full); +bool __min_heap_empty(min_heap_char *heap) +{ + return __min_heap_empty_inline(heap); +} +EXPORT_SYMBOL(__min_heap_empty); + void __min_heap_sift_down(min_heap_char *heap, size_t pos, size_t elem_size, const struct min_heap_callbacks *func, void *args) { -- 2.43.0