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lib min_heap: add min_heap_del()

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

Link: https://lkml.kernel.org/r/20240524152958.919343-11-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>

authored by

Kuan-Wei Chiu and committed by
Andrew Morton 420f1710 eaa0bc71

+24
+24
include/linux/min_heap.h
··· 212 212 #define min_heap_push(_heap, _element, _func, _args) \ 213 213 __min_heap_push((min_heap_char *)_heap, _element, __minheap_obj_size(_heap), _func, _args) 214 214 215 + /* Remove ith element from the heap, O(log2(nr)). */ 216 + static __always_inline 217 + bool __min_heap_del(min_heap_char *heap, size_t elem_size, size_t idx, 218 + const struct min_heap_callbacks *func, void *args) 219 + { 220 + void *data = heap->data; 221 + 222 + if (WARN_ONCE(heap->nr <= 0, "Popping an empty heap")) 223 + return false; 224 + 225 + /* Place last element at the root (position 0) and then sift down. */ 226 + heap->nr--; 227 + if (idx == heap->nr) 228 + return true; 229 + func->swp(data + (idx * elem_size), data + (heap->nr * elem_size), args); 230 + __min_heap_sift_up(heap, elem_size, idx, func, args); 231 + __min_heapify(heap, idx, elem_size, func, args); 232 + 233 + return true; 234 + } 235 + 236 + #define min_heap_del(_heap, _idx, _func, _args) \ 237 + __min_heap_del((min_heap_char *)_heap, __minheap_obj_size(_heap), _idx, _func, _args) 238 + 215 239 #endif /* _LINUX_MIN_HEAP_H */