diff --git a/revision.c b/revision.c
index 087d64d572..deaabec3e4 100644
--- a/revision.c
+++ b/revision.c
@@ -750,32 +750,43 @@ static int check_maybe_different_in_bloom_filter(struct rev_info *revs,
 						 struct commit *commit)
 {
 	struct bloom_filter *filter;
-	int result = 0;
-
-	if (!revs->bloom_keyvecs_nr)
-		return -1;
+	int result;
 
 	if (commit_graph_generation(commit) == GENERATION_NUMBER_INFINITY)
 		return -1;
 
 	filter = get_bloom_filter(revs->repo, commit);
-
 	if (!filter) {
 		count_bloom_filter_not_present++;
 		return -1;
 	}
 
+	result = revs_maybe_changed_in_bloom(revs, filter);
+	if (result < 0)
+		return result;
+
+	if (result)
+		count_bloom_filter_maybe++;
+	else
+		count_bloom_filter_definitely_not++;
+
+	return result;
+}
+
+int revs_maybe_changed_in_bloom(struct rev_info *revs,
+				struct bloom_filter *filter)
+{
+	int result = 0;
+
+	if (!revs->bloom_keyvecs_nr)
+		return -1;
+
 	for (size_t nr = 0; !result && nr < revs->bloom_keyvecs_nr; nr++) {
 		result = bloom_filter_contains_vec(filter,
 						   revs->bloom_keyvecs[nr],
 						   revs->bloom_filter_settings);
 	}
 
-	if (result)
-		count_bloom_filter_maybe++;
-	else
-		count_bloom_filter_definitely_not++;
-
 	return result;
 }
 
diff --git a/revision.h b/revision.h
index 569b3fa1cb..7569c210cc 100644
--- a/revision.h
+++ b/revision.h
@@ -68,6 +68,7 @@ struct string_list;
 struct saved_parents;
 struct follow_pathspec_slab;
 struct bloom_keyvec;
+struct bloom_filter;
 struct bloom_filter_settings;
 struct option;
 struct parse_opt_ctx_t;
@@ -493,6 +494,22 @@ void reset_revision_walk(void);
  */
 int prepare_revision_walk(struct rev_info *revs);
 
+/**
+ * Take in a changed-path Bloom filter that belongs to a commit, and consult it
+ * to see if it might have modified any of the paths in the `revs`.
+ * The caller should look up `filter`, probably with get_bloom_filter().
+ * prepare_revision_walk() needs to be called in advance to ensure
+ * pathspec key vectors are set up.
+ *
+ * Returns -1 if no sensible answer could be given because of missing
+ * preconditions (no pathspec key vectors).
+ * Returns 0 if the commit definitely did not change any of the paths and 1 if
+ * the commit maybe has changed one of them, although that might be a
+ * false-positive.
+ */
+int revs_maybe_changed_in_bloom(struct rev_info *revs,
+				struct bloom_filter *filter);
+
 /* Drain the commits linked list into the priority queue. */
 void rev_info_commit_list_to_queue(struct rev_info *revs);
 /**