[PATCH] kernel-module-split: Add support for KERNEL_MODULE_AUTOLOAD and KERNEL_MODULE_PROBECONF

[Richard Purdie <richard.purdie@linuxfoundation.org>]

The current module_autoload_* and module_conf_* variables are error
both ugly and error prone. They aren't registered in the task checksums
so changes to them aren't reflected in the build. This turns out to
be near impossible to fix with the current variable format in any
sensible way :(.

This patch replace module_autoload with the list of variables in
KERNEL_MODULE_AUTOLOAD which is a much simpler and usable API. An
error is printed if an old style variable is encountered. It should
be simple to convert to this.

module_conf_* are harder to deal with since there is data associated
with it, it isn't simply a flag. We need a list of variables that are set
in order to be able to correctly handle the task checksum so we add
KERNEL_MODULE_PROBECONF for this purpose and error if the user hasn't
added a module to it when they should have.

[YOCTO #5786]

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/meta/classes/kernel-module-split.bbclass b/meta/classes/kernel-module-split.bbclass
index d43f743..e38a6f6 100644
--- a/meta/classes/kernel-module-split.bbclass
+++ b/meta/classes/kernel-module-split.bbclass
@@ -130,8 +130,11 @@ python split_kernel_module_packages () {
 
         # If autoloading is requested, output /etc/modules-load.d/<name>.conf and append
         # appropriate modprobe commands to the postinst
+        autoloadlist = (d.getVar("KERNEL_MODULE_AUTOLOAD", True) or "").split()
         autoload = d.getVar('module_autoload_%s' % basename, True)
         if autoload:
+            bb.error("KERNEL_MODULE_AUTOLOAD has replaced module_autoload_%s, please replace it!" % basename)
+        if basename in autoloadlist:
             name = '%s/etc/modules-load.d/%s.conf' % (dvar, basename)
             f = open(name, 'w')
             for m in autoload.split():
@@ -144,12 +147,15 @@ python split_kernel_module_packages () {
             d.setVar('pkg_postinst_%s' % pkg, postinst)
 
         # Write out any modconf fragment
+        modconflist = (d.getVar("KERNEL_MODULE_PROBECONF", True) or "").split()
         modconf = d.getVar('module_conf_%s' % basename, True)
-        if modconf:
+        if modconf and basename in modconflist:
             name = '%s/etc/modprobe.d/%s.conf' % (dvar, basename)
             f = open(name, 'w')
             f.write("%s\n" % modconf)
             f.close()
+        elif modconf:
+            bb.error("Please ensure module %s is listed in KERNEL_MODULE_PROBECONF since module_conf_%s is set" % (basename, basename))
 
         files = d.getVar('FILES_%s' % pkg, True)
         files = "%s /etc/modules-load.d/%s.conf /etc/modprobe.d/%s.conf" % (files, basename, basename)
@@ -185,3 +191,5 @@ python split_kernel_module_packages () {
         if len(os.listdir(dir)) == 0:
             os.rmdir(dir)
 }
+
+do_package[vardeps] += '${@" ".join(map(lambda s: "module_conf_" + s, (d.getVar("KERNEL_MODULE_PROBECONF", True) or "").split()))}'