pack-bitmap: drop unused max_bitmaps parameter

The `max_bitmaps` parameter in `bitmap_writer_select_commits()` was
introduced back in 7cc8f97 (pack-objects: implement bitmap writing,
2013-12-21), making it original to the bitmap implementation in Git
itself.

When that patch was merged via 0f9e62e (Merge branch
'jk/pack-bitmap', 2014-02-27), its sole caller in builtin/pack-objects.c
passed a value of "-1" for `max_bitmaps`, indicating no limit.

Since then, the only other caller (in midx.c, added via c528e17
(pack-bitmap: write multi-pack bitmaps, 2021-08-31)) also uses a value
of "-1" for `max_bitmaps`.

Since no callers have needed a finite limit for the `max_bitmaps`
parameter in the nearly decade that has passed since 0f9e62e, let's
remove the parameter and any dead pieces of code connected to it.

Signed-off-by: Taylor Blau <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: ttaylorr

builtin/pack-objects.c

@@ -1364,8 +1364,7 @@ static void write_pack_file(void)
 							    progress);
 				bitmap_writer_select_commits(&bitmap_writer,
 							     indexed_commits,
-							     indexed_commits_nr,
-							     -1);
+							     indexed_commits_nr);
 				if (bitmap_writer_build(&bitmap_writer, &to_pack) < 0)
 					die(_("failed to write bitmap index"));
 				bitmap_writer_finish(&bitmap_writer,

midx-write.c

@@ -841,7 +841,7 @@ static int write_midx_bitmap(const char *midx_name,
 	for (i = 0; i < pdata->nr_objects; i++)
 		index[pack_order[i]] = &pdata->objects[i].idx;
 
-	bitmap_writer_select_commits(&writer, commits, commits_nr, -1);
+	bitmap_writer_select_commits(&writer, commits, commits_nr);
 	ret = bitmap_writer_build(&writer, pdata);
 	if (ret < 0)
 		goto cleanup;

pack-bitmap-write.c

@@ -587,8 +587,7 @@ static int date_compare(const void *_a, const void *_b)
 
 void bitmap_writer_select_commits(struct bitmap_writer *writer,
 				  struct commit **indexed_commits,
-				  unsigned int indexed_commits_nr,
-				  int max_bitmaps)
+				  unsigned int indexed_commits_nr)
 {
 	unsigned int i = 0, j, next;
 
@@ -611,11 +610,6 @@ void bitmap_writer_select_commits(struct bitmap_writer *writer,
 		if (i + next >= indexed_commits_nr)
 			break;
 
-		if (max_bitmaps > 0 && writer->selected_nr >= max_bitmaps) {
-			writer->selected_nr = max_bitmaps;
-			break;
-		}
-
 		if (next == 0) {
 			chosen = indexed_commits[i];
 		} else {

pack-bitmap.h

@@ -131,8 +131,7 @@ struct ewah_bitmap *bitmap_for_commit(struct bitmap_index *bitmap_git,
 				      struct commit *commit);
 void bitmap_writer_select_commits(struct bitmap_writer *writer,
 				  struct commit **indexed_commits,
-				  unsigned int indexed_commits_nr,
-				  int max_bitmaps);
+				  unsigned int indexed_commits_nr);
 int bitmap_writer_build(struct bitmap_writer *writer,
 			struct packing_data *to_pack);
 void bitmap_writer_finish(struct bitmap_writer *writer,