From: Justin Bedő <cu@cua0.org>
Date: Tue, 25 Jul 2017 17:30:20 +0000 (+1000)
Subject: Fix autoconf detection of super_setup_bdi_name
X-Git-Tag: zfs-0.7.0~6
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=f269060a24d1f43a30d647e0835ca4fcaac6bae9;p=zfs

Fix autoconf detection of super_setup_bdi_name

The previous autoconf test for the presence of super_setup_bdi_name()
uses an invocation with an incorrect type signature, producing a
warning by the compiler when the test is run. This gets elevated to an
error when compiling with -Werror=format-security, causing autoconf to
falsely infer super_setup_bdi_name() is not present. This updates the
testing code to match the invocation used in
include/linux/vfs_compat.h.

Reviewed-by: loli10K <ezomori.nozomu@gmail.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Justin Bedo <cu@cua0.org>
Closes #6398
---

diff --git a/config/kernel-bdi.m4 b/config/kernel-bdi.m4
index c2a9dd28b..cb7479ee9 100644
--- a/config/kernel-bdi.m4
+++ b/config/kernel-bdi.m4
@@ -11,8 +11,9 @@ AC_DEFUN([ZFS_AC_KERNEL_BDI], [
 		struct super_block sb;
 	], [
 		char *name = "bdi";
+		atomic_long_t zfs_bdi_seq;
 		int error __attribute__((unused)) =
-		    super_setup_bdi_name(&sb, name);
+		    super_setup_bdi_name(&sb, "%.28s-%ld", name, atomic_long_inc_return(&zfs_bdi_seq));
 	], [super_setup_bdi_name], [fs/super.c], [
 		AC_MSG_RESULT(yes)
 		AC_DEFINE(HAVE_SUPER_SETUP_BDI_NAME, 1,