tree-walk.c: break circular dependency with unpack-trees

The unpack-trees API depends on the tree-walk API. But we've recently
introduced a dependency in tree-walk.c on MAX_UNPACK_TREES, which
doesn't otherwise care about unpack-trees at all.

Let's break that dependency by reversing the constants: we'll introduce
a new MAX_TRAVERSE_TREES which belongs to the tree-walk API. And then we
can define MAX_UNPACK_TREES in terms of that (since unpack-trees cannot
possibly work with more trees than it can traverse at once via
tree-walk).

The value for both will remain at 8. This is somewhat arbitrary and
probably more than is necessary, per ca885a4fe6 (read-tree() and
unpack_trees(): use consistent limit, 2008-03-13), but there's not
really any pressing need to reduce it.

Suggested-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Jeff King <peff@peff.net>
Acked-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/tree-walk.c b/tree-walk.c
index 3093cf7098..bb0ad34c54 100644
--- a/tree-walk.c
+++ b/tree-walk.c
@@ -1,6 +1,5 @@
 #include "cache.h"
 #include "tree-walk.h"
-#include "unpack-trees.h"
 #include "dir.h"
 #include "object-store.h"
 #include "tree.h"
@@ -410,7 +409,7 @@ int traverse_trees(struct index_state *istate,
 		   struct traverse_info *info)
 {
 	int error = 0;
-	struct name_entry entry[MAX_UNPACK_TREES];
+	struct name_entry entry[MAX_TRAVERSE_TREES];
 	int i;
 	struct tree_desc_x tx[ARRAY_SIZE(entry)];
 	struct strbuf base = STRBUF_INIT;