build: provide virtual self in kmods

Add an implicit self-provide to kmods. apk can't handle self provides,
be it versioned or virtual, so opt for a prefix and a suffix instead.
Package name without a prefix/suffix is too generic and might conflict
with other packages, e.g. wireguard. This allows several variants to
provide the same virtual package without adding extra provides to the
default one, e.g. r8169 implicitly provides kmod-r8169-any and is marked
as default, so r8125 can explicitly provide @kmod-r8169-any as well.

Signed-off-by: George Sapkin <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/21288
(cherry picked from commit 9b37b7185c18855f4e017ac573701cdcd92fbcd1)
Link: https://github.com/openwrt/openwrt/pull/21355
Signed-off-by: Robert Marko <[email protected]>

include/kernel.mk

@@ -219,6 +219,15 @@ define KernelPackage
     $(call KernelPackage/$(1))
     $(call KernelPackage/$(1)/$(BOARD))
     $(call KernelPackage/$(1)/$(BOARD)/$(SUBTARGET))
+
+    # Add an implicit self-provide. apk can't handle self provides, be it
+    # versioned or virtual, so opt for a prefix and a suffix instead. Package
+    # name without a prefix/suffix is too generic and might conflict with other
+    # packages, e.g. wireguard. This allows several variants to provide the same
+    # virtual package without adding extra provides to the default one, e.g.
+    # r8169 implicitly provides kmod-r8169-any and is marked as default, so
+    # r8125 can explicitly provide @kmod-r8169-any as well.
+    PROVIDES+=@kmod-$(1)-any
   endef
 
   ifdef KernelPackage/$(1)/conffiles
@@ -306,4 +315,3 @@ kernel_patchver_ge=$(call kernel_version_cmp,-ge,$(KERNEL_PATCHVER),$(1))
 kernel_patchver_eq=$(call kernel_version_cmp,-eq,$(KERNEL_PATCHVER),$(1))
 kernel_patchver_le=$(call kernel_version_cmp,-le,$(KERNEL_PATCHVER),$(1))
 kernel_patchver_lt=$(call kernel_version_cmp,-lt,$(KERNEL_PATCHVER),$(1))
-

include/package-pack.mk

@@ -134,10 +134,13 @@ endef
 #
 # - apk doesn't like it when packages specify a redundant provide pointing to
 #   self. Filter it out, but keep virtual self provides, in the form of
-#   @${package_name}-any.
+#   @(kmod-)?${package_name}-any.
 #
 # - Packages implicitly add a virtual @${package_name}-any provide in Package.
 #
+# - kmods implicitly add a virtual @kmod-${package_name}-any provide in
+#   KernelPackage.
+#
 # 1: package name
 # 2: package version
 # 3: list of provides