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[PATCH v2 14/14] commit.h: delete 'util' field in struct commit

If you have come this far, you probably have seen that this 'util'
pointer is used for many different purposes. Some are not even
contained in a command code, but buried deep in common code with no
clue who will use it and how.

The move to using commit-slab gives us a much better picture of how
some piece of data is associated with a commit and what for. Since
nobody uses 'util' pointer anymore, we can retire so that nobody will
abuse it again. commit-slab will be the way forward for associating
data to a commit.

As a side benefit, this shrinks struct commit by 8 bytes (on 64-bit
architecture) which should help reduce memory usage for reachability
test a bit. This is also what commit-slab is invented for [1].

[1] 96c4f4a370 (commit: allow associating auxiliary info on-demand -

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
 commit.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/commit.h b/commit.h
index 838f6a6b26..70371e111e 100644
--- a/commit.h
+++ b/commit.h
@@ -18,12 +18,16 @@ struct commit_list {
 struct commit {
 	struct object object;
-	void *util;
 	unsigned int index;
 	timestamp_t date;
 	struct commit_list *parents;
 	struct tree *tree;
 	uint32_t graph_pos;
+	/*
+	 * Do not add more fields here unless it's _very_ often
+	 * used. Use commit-slab to associate more data with a commit
+	 * instead.
+	 */
 extern int save_commit_buffer;