Add LINUX_VERSION_SUBLEVEL to linux/version.h in LTS

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Upstream kernel commit 88a686728b37 ("kbuild: simplify access to the kernel's version") [0] extended the Makefile to add the following defines to the linux/version.h file:

I would like to have these defines especially LINUX_VERSION_SUBLEVEL also in older stable kernel versions to make it easier for out of tree kernel code to detect which version it is compiling against.

In the Linux drivers backports project [1] we backport the current wifi driver to older Linux versions, so someone with an old kernel can use current wifi drivers. To make this work we have to know which kernel version it is being compiled against. The Makefile has access to the SUBLEVEL variable and can also forward it to the C code, but this does not work when someone compiles some other driver against the mac80211 subsystem provided by backports for example.

I tried to cherry-pick commit 88a686728b37 to kernel 4.9, but it did not apply cleanly. Would it get accepted when I just port the changes in the main Makefile to the currently supported LTS kernel versions?



Here would be my suggestion for kernel 4.9, I haven't tested this yet:
--- a/Makefile
+++ b/Makefile
@@ -1142,7 +1142,10 @@ endef
 define filechk_version.h
 	(echo \#define LINUX_VERSION_CODE $(shell                         \
 	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 255); \
-	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
+	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) \
+	echo \#define LINUX_VERSION_MAJOR $(VERSION);                    \
+	echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL);            \

 $(version_h): $(srctree)/Makefile FORCE
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