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[v6,1/5] kernel-module-split.bbclass: add get_ext_mod function for module signing

Message ID 20260826082321.22104-2-anis.bougrine10@gmail.com
State Under Review
Headers show
Series Make signed kernel modules stripped | expand

Commit Message

Bougrine Anis Aug. 26, 2026, 8:23 a.m. UTC 
Fixes [YOCTO #12927]

Out-of-tree module Makefiles invoke the kernel Makefile by appending
the M= (the module directory) variable to the MAKEFLAGS.
However, they usually do not provide a modules_sign target. Therefore,
the kernel modules_sign target has to be invoked manually after retrieving
M= variable from package source code Makefile.

This function retrieves the M= variable from an external module Makefile.

Reported-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Anis Bougrine <anis.bougrine10@gmail.com>
---
 .../kernel-module-split.bbclass               | 21 +++++++++++++++++++
 1 file changed, 21 insertions(+)
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Patch

diff --git a/meta/classes-recipe/kernel-module-split.bbclass b/meta/classes-recipe/kernel-module-split.bbclass
index ab2f0d1c37..bde7cd02dd 100644
--- a/meta/classes-recipe/kernel-module-split.bbclass
+++ b/meta/classes-recipe/kernel-module-split.bbclass
@@ -42,6 +42,27 @@  KERNEL_MODULE_PACKAGE_PREFIX ?= ""
 KERNEL_MODULE_PACKAGE_SUFFIX ?= "-${KERNEL_VERSION}"
 KERNEL_MODULE_PROVIDE_VIRTUAL ?= "1"
 
+def get_ext_mod(d):
+    """
+    Extract the resolved Kbuild M= variable from an out of tree module Makefile variable database.
+    """
+    import re
+    import bb.process
+
+    try:
+        output = bb.process.run(
+            "make -C %s --dry-run --print-data-base" % d.getVar("B")
+        )[0]
+    except bb.process.ExecutionError:
+        return d.getVar("S")
+
+    for line in output.splitlines():
+        m = re.match(r'^M\s*=\s*(.*)$', line)
+        if m:
+            return m.group(1).strip()
+
+    return d.getVar("S")
+
 python split_kernel_module_packages () {
     import re