kernel: provide module.lds for out of tree builds in v5.10+

The upstream commit 596b0474d3d [kbuild: preprocess module linker
script], adds a dependency on module.lds for external module
building.

Since module.lds is generated as part of 'modules_prepare', we
must make it available with the other kernel artifacts in the
kernel shared workdir, otherwise out of tree builds fail.

This fixes errors like:

    | make[4]: *** No rule to make target 'scripts/module.lds', needed by
        'build/tmp/work/qemuarm64-poky-linux/cryptodev-module/1.11-r0/git/cryptodev.ko'.
        Stop.
    | make[4]: *** Waiting for unfinished jobs....

We also ensure that kernel-devsrc has a copy to support on
target module builds that are often prepared with 'make scripts
prepare'. Those targets won't regenerate it, so the build fails.
If 'make modules_prepare' is used, the file will be regenerated
and overwrite our copy (as expected).

(From OE-Core rev: 0fc66a0b64953aae38d0124b57615fffaec8de52)

Signed-off-by: Pan, Kris <kris.pan@intel.com>
Signed-off-by: Lili Li <lili.li@intel.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 7 insertions, 0 deletions

diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
index 78def5bbc1..22c92381c0 100644
--- a/meta/classes/kernel.bbclass
+++ b/meta/classes/kernel.bbclass
@@ -486,6 +486,7 @@ do_shared_workdir () {
         # Copy files required for module builds
         cp System.map $kerneldir/System.map-${KERNEL_VERSION}
         [ -e Module.symvers ] && cp Module.symvers $kerneldir/
+        [ -e scripts/module.lds ] && install -Dm 0644 scripts/module.lds $kerneldir/scripts/module.lds
         cp .config $kerneldir/
         mkdir -p $kerneldir/include/config
         cp include/config/kernel.release $kerneldir/include/config/kernel.release
diff --git a/meta/recipes-kernel/linux/kernel-devsrc.bb b/meta/recipes-kernel/linux/kernel-devsrc.bb
index aa8e162f4f..8373c97a31 100644
--- a/meta/recipes-kernel/linux/kernel-devsrc.bb
+++ b/meta/recipes-kernel/linux/kernel-devsrc.bb
@@ -86,6 +86,12 @@ do_install() {
         # be dealt with.
         # cp -a scripts $kerneldir/build
 
+        # although module.lds can be regenerated on target via 'make modules_prepare'
+        # there are several places where 'makes scripts prepare' is done, and that won't
+        # regenerate the file. So we copy it onto the target as a migration to using
+        # modules_prepare
+        cp -a --parents scripts/module.lds $kerneldir/build/ 2>/dev/null || :
+
         if [ -d arch/${ARCH}/scripts ]; then
             cp -a arch/${ARCH}/scripts $kerneldir/build/arch/${ARCH}
         fi