meta-agl-bsp: Add CONFIG_LSM workaround for 5.1+ kernels

Add explicit clearing of CONFIG_LSM before running "make oldconfig"
in the do_configure_append added by linux-agl.inc. This ensures that
the derived value of CONFIG_LSM will reflect configuration changes
done by the merged AGL provided fragments, i.e. SMACK being enabled.
Without it, kernel recipes that are not based on linux-yocto.bbclass
or have their own fragment handling done via prepend will end up with
an incorrect value of CONFIG_LSM which effectively disables SMACK.
Examples include the linux-imx or linux-fslc kernels used by NXP.

Bug-AGL: SPEC-2932

Change-Id: Id99906e3de75128ebc54866d43d89d3a24bb1cf2
Signed-off-by: Scott Murray <scott.murray@konsulko.com>

diff --git a/meta-agl-bsp/recipes-kernel/linux/linux-agl.inc b/meta-agl-bsp/recipes-kernel/linux/linux-agl.inc
index 17fe96d..c03c56e 100644 (file)
--- a/meta-agl-bsp/recipes-kernel/linux/linux-agl.inc
+++ b/meta-agl-bsp/recipes-kernel/linux/linux-agl.inc
@@ -14,6 +14,9 @@ def find_cfgs(d):
 
 do_configure_append () {
     [ ! -f .config ] && cp -a ${WORKDIR}/defconfig .config
+    # Need to clear CONFIG_LSM for 5.1+ kernels to ensure it'll get
+    # regenerated to reflect configuration changes (e.g. SMACK).
+    sed -i '/^CONFIG_LSM/d' .config
     merge_config.sh -m .config ${@" ".join(find_cfgs(d))}
     yes '' | make oldconfig
 }