From 84f9e8cfe34f7df196e5aa147e2b9ae45bc3b4f3 Mon Sep 17 00:00:00 2001
From: David Sterba <dsterba@suse.com>
Date: Thu, 3 Nov 2016 00:53:43 +0100
Subject: [PATCH] btrfs-progs: image: add symbolic constant for max thread
 count

Signed-off-by: David Sterba <dsterba@suse.com>
---
 btrfs-image.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/btrfs-image.c b/btrfs-image.c
index 2c1d591b..3f403015 100644
--- a/btrfs-image.c
+++ b/btrfs-image.c
@@ -44,6 +44,8 @@
 #define COMPRESS_NONE		0
 #define COMPRESS_ZLIB		1
 
+#define MAX_WORKER_THREADS	(32)
+
 struct meta_cluster_item {
 	__le64 bytenr;
 	__le32 size;
@@ -2761,9 +2763,10 @@ int main(int argc, char *argv[])
 			break;
 		case 't':
 			num_threads = arg_strtou64(optarg);
-			if (num_threads > 32) {
-				error("number of threads out of range: %llu",
-					(unsigned long long)num_threads);
+			if (num_threads > MAX_WORKER_THREADS) {
+				error("number of threads out of range: %llu > %d",
+					(unsigned long long)num_threads,
+					MAX_WORKER_THREADS);
 				return 1;
 			}
 			break;