diff options
| author | Kuan-Wei Chiu <visitorckw@gmail.com> | 2024-05-24 23:29:48 +0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-06-24 22:24:57 -0700 |
| commit | 0562d54ddc3dc195f338bd8e816dd8ff154f44ad (patch) | |
| tree | 35b35f79e06b518c31ff7f0f98358b40e6670b31 | |
| parent | e146683ccff9af2d26b70a9ea4c87f5a86eff0c4 (diff) | |
lib min_heap: add min_heap_peek()
Add min_heap_peek() to retrieve a pointer to the smallest element. The
pointer is cast to the appropriate type of heap elements.
Link: https://lkml.kernel.org/r/20240524152958.919343-7-visitorckw@gmail.com
Signed-off-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Bagas Sanjaya <bagasdotme@gmail.com>
Cc: Brian Foster <bfoster@redhat.com>
Cc: Ching-Chun (Jim) Huang <jserv@ccns.ncku.edu.tw>
Cc: Coly Li <colyli@suse.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Matthew Sakai <msakai@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
| -rw-r--r-- | include/linux/min_heap.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/min_heap.h b/include/linux/min_heap.h index b384a4ea2afa9..d9c4ae7ad0cc9 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, |