Add a documentat on how to revert a faulty merge

diff --git a/decorate.c b/decorate.c
index d9668d2ef94c73e4a7a5602011ff13a9fd9d8c6a..82d9e221eabab53acc418d0db6327e480836a5ed 100644 (file)
--- a/decorate.c
+++ b/decorate.c
@@ -6,13 +6,13 @@
 #include "object.h"
 #include "decorate.h"
 
-static unsigned int hash_obj(struct object *obj, unsigned int n)
+static unsigned int hash_obj(const struct object *obj, unsigned int n)
 {
        unsigned int hash = *(unsigned int *)obj->sha1;
        return hash % n;
 }
 
-static void *insert_decoration(struct decoration *n, struct object *base, void *decoration)
+static void *insert_decoration(struct decoration *n, const struct object *base, void *decoration)
 {
        int size = n->size;
        struct object_decoration *hash = n->hash;
@@ -44,7 +44,7 @@ static void grow_decoration(struct decoration *n)
        n->nr = 0;
 
        for (i = 0; i < old_size; i++) {
-               struct object *base = old_hash[i].base;
+               const struct object *base = old_hash[i].base;
                void *decoration = old_hash[i].decoration;
 
                if (!base)
@@ -55,7 +55,8 @@ static void grow_decoration(struct decoration *n)
 }
 
 /* Add a decoration pointer, return any old one */
-void *add_decoration(struct decoration *n, struct object *obj, void *decoration)
+void *add_decoration(struct decoration *n, const struct object *obj,
+               void *decoration)
 {
        int nr = n->nr + 1;
 
@@ -65,7 +66,7 @@ void *add_decoration(struct decoration *n, struct object *obj, void *decoration)
 }
 
 /* Lookup a decoration pointer */
-void *lookup_decoration(struct decoration *n, struct object *obj)
+void *lookup_decoration(struct decoration *n, const struct object *obj)
 {
        int j;