linux-kernel - [PATCH] kmod: add dependencies for test module

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Message-Id: <20170630154834.3689272-1-arnd@arndb.de>
Date:   Fri, 30 Jun 2017 17:47:44 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Subject: [PATCH] kmod: add dependencies for test module

When we try to 'select' drivers whose dependencies are not met,
we get a kconfig warning and undefined behavior as further 'select'
statements in those drivers can not be honored:

warning: (TEST_KMOD) selects TUN which has unmet direct dependencies (NETDEVICES && NET_CORE && INET)
warning: (TEST_KMOD) selects XFS_FS which has unmet direct dependencies (BLOCK && (64BIT || LBDAF))
ERROR: "iomap_zero_range" [fs/xfs/xfs.ko] undefined!
ERROR: "iomap_fiemap" [fs/xfs/xfs.ko] undefined!
ERROR: "iomap_page_mkwrite" [fs/xfs/xfs.ko] undefined!

To work around that, this adds the dependencies required by the
'tun', 'xfs' and 'btrfs' modules for CONFIG_TEST_KMOD, guaranteeing
that we can always enable those, and fixing the 'randconfig' issues.

Unfortunately, there is another problem that I have not found a
good solution for: If any of the three drivers are built-in rather
than loadable modules, then the module load test will later fail
at runtime.

Fixes: ec159fed8677 ("kmod: add test driver to stress test the module loader")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 lib/Kconfig.debug | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 411cddd713c0..0f7ba738ef7a 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1883,6 +1883,8 @@ config TEST_KMOD
 	tristate "kmod stress tester"
 	default n
 	depends on m
+	depends on BLOCK && (64BIT || LBDAF)	  # for XFS, BTRFS
+	depends on NETDEVICES && NET_CORE && INET # for TUN
 	select TEST_LKM
 	select XFS_FS
 	select TUN
-- 
2.9.0