dm vdo: update min_heap_callbacks to use default builtin swap

Replace the swp function pointer in the min_heap_callbacks of dm-vdo with
NULL, allowing direct usage of the default builtin swap implementation. 
This modification simplifies the code and improves performance by removing
unnecessary function indirection.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Kuan-Wei Chiu <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Ching-Chun (Jim) Huang <[email protected]>
Cc: Coly Li <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Kent Overstreet <[email protected]>
Cc: "Liang, Kan" <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Matthew Sakai <[email protected]>
Cc: Matthew Wilcox (Oracle) <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: visitorckw

drivers/md/dm-vdo/repair.c

@@ -166,7 +166,7 @@ static void swap_mappings(void *item1, void *item2, void __always_unused *args)
 
 static const struct min_heap_callbacks repair_min_heap = {
 	.less = mapping_is_less_than,
-	.swp = swap_mappings,
+	.swp = NULL,
 };
 
 static struct numbered_block_mapping *sort_next_heap_element(struct repair_completion *repair)

drivers/md/dm-vdo/slab-depot.c

@@ -3301,17 +3301,9 @@ static bool slab_status_is_less_than(const void *item1, const void *item2,
 	return info1->slab_number < info2->slab_number;
 }
 
-static void swap_slab_statuses(void *item1, void *item2, void __always_unused *args)
-{
-	struct slab_status *info1 = item1;
-	struct slab_status *info2 = item2;
-
-	swap(*info1, *info2);
-}
-
 static const struct min_heap_callbacks slab_status_min_heap = {
 	.less = slab_status_is_less_than,
-	.swp = swap_slab_statuses,
+	.swp = NULL,
 };
 
 /* Inform the slab actor that a action has finished on some slab; used by apply_to_slabs(). */