[PATCH 3/7] drivers/staging: make android tegra_ion.c properly tristate

[Paul Gortmaker]

The Kconfig currently controlling compilation of this code is:

drivers/staging/android/ion/Kconfig:config ION_TEGRA
drivers/staging/android/ion/Kconfig:    tristate "Ion for Tegra"

...which led me to incorrectly conclude this file was built modular
earlier.  However the above CONFIG is just used to enter the dir and
once we do enter that dir, we see the build is unconditional:

drivers/staging/android/ion/Makefile:obj-$(CONFIG_ION_TEGRA) += tegra/
drivers/staging/android/ion/tegra/Makefile:obj-y += tegra_ion.o

...meaning that it currently is not being built as a module by anyone.

However, given that the Kconfig did explicitly choose tristate, and that
the dummy ion driver is (functionally) tristate, I chose to make the
Makefile do the right thing for it to build as a module.

After this change, on an ARM allmodconfig, we see:

  CC [M]  drivers/staging/android/ion/tegra/tegra_ion.o

so it does build OK as a module.  I can't vouch for the modular
functionality however, so consider this compile tested only.

Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
Cc: "Arve Hjønnevåg" <arve at android.com>
Cc: Riley Andrews <riandrews at android.com>
Cc: Stephen Warren <swarren at wwwdotorg.org>
Cc: Thierry Reding <thierry.reding at gmail.com>
Cc: Alexandre Courbot <gnurou at gmail.com>
Cc: Markus Elfring <elfring at users.sourceforge.net>
Cc: devel at driverdev.osuosl.org
Cc: linux-tegra at vger.kernel.org
Signed-off-by: Paul Gortmaker <paul.gortmaker at windriver.com>
---
 drivers/staging/android/ion/tegra/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/android/ion/tegra/Makefile b/drivers/staging/android/ion/tegra/Makefile
index 11cd003fb08f..808f1f53f11a 100644
--- a/drivers/staging/android/ion/tegra/Makefile
+++ b/drivers/staging/android/ion/tegra/Makefile
@@ -1 +1 @@
-obj-y += tegra_ion.o
+obj-$(CONFIG_ION_TEGRA) += tegra_ion.o
-- 
2.6.1