bcachefs: Reduce stack frame size of bch2_check_alloc_info()

Excessive inlining may (on some versions of gcc?) cause excessive stack
usage; this turns off some inlining in bch2_check_alloc_info.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/alloc_background.c

@@ -1030,7 +1030,8 @@ struct bkey_s_c bch2_get_key_or_real_bucket_hole(struct btree_iter *iter, struct
 	return k;
 }
 
-static int bch2_check_alloc_key(struct btree_trans *trans,
+static noinline_for_stack
+int bch2_check_alloc_key(struct btree_trans *trans,
 			 struct bkey_s_c alloc_k,
 			 struct btree_iter *alloc_iter,
 			 struct btree_iter *discard_iter,
@@ -1159,7 +1160,8 @@ static int bch2_check_alloc_key(struct btree_trans *trans,
 	return ret;
 }
 
-static int bch2_check_alloc_hole_freespace(struct btree_trans *trans,
+static noinline_for_stack
+int bch2_check_alloc_hole_freespace(struct btree_trans *trans,
 				    struct bpos start,
 				    struct bpos *end,
 				    struct btree_iter *freespace_iter)
@@ -1214,7 +1216,8 @@ static int bch2_check_alloc_hole_freespace(struct btree_trans *trans,
 	return ret;
 }
 
-static int bch2_check_alloc_hole_bucket_gens(struct btree_trans *trans,
+static noinline_for_stack
+int bch2_check_alloc_hole_bucket_gens(struct btree_trans *trans,
 				      struct bpos start,
 				      struct bpos *end,
 				      struct btree_iter *bucket_gens_iter)
@@ -1279,7 +1282,7 @@ static int bch2_check_alloc_hole_bucket_gens(struct btree_trans *trans,
 	return ret;
 }
 
-static int __bch2_check_discard_freespace_key(struct btree_trans *trans,
+static noinline_for_stack int __bch2_check_discard_freespace_key(struct btree_trans *trans,
 					      struct btree_iter *iter)
 {
 	struct bch_fs *c = trans->c;
@@ -1359,7 +1362,8 @@ static int bch2_check_discard_freespace_key(struct btree_trans *trans,
  * valid for buckets that exist; this just checks for keys for nonexistent
  * buckets.
  */
-static int bch2_check_bucket_gens_key(struct btree_trans *trans,
+static noinline_for_stack
+int bch2_check_bucket_gens_key(struct btree_trans *trans,
 			       struct btree_iter *iter,
 			       struct bkey_s_c k)
 {