On Mon, Jun 18, 2018 at 12:14:09PM +0800, Waiman Long wrote:

+#ifdef CONFIG_DEBUG_KERNEL
+static inline void debug_print_domains(cpumask_var_t *doms, int ndoms)
+{
+	int i;
+	char buf[200];
+	char *ptr, *end = buf + sizeof(buf) - 1;
+
+	for (i = 0, ptr = buf, *end = '\0'; i < ndoms; i++)
+		ptr += snprintf(ptr, end - ptr, "dom%d=%*pbl ", i,
+				cpumask_pr_args(doms[i]));
+
+	pr_debug("Generated %d domains: %s\n", ndoms, buf);
+}

Why not use pr_cont() and do away with that static buffer?
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