Description of problem:

If you set 'sublevel' to a non-integer value, say 19.3 or 20.1, you will break
the toplevel kernel Makefile, and cause failure to compile.  Specifically, in
the Makefile:

define filechk_version.h
        (echo \#define LINUX_VERSION_CODE $(shell                             \
        expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL));     \
        echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
endef

This 'expr' will fail with non-numeric value in $SUBLEVEL.  This leaves
LINUX_VERSION_CODE undefined, and causes syntax errors.  The first one appears
in drivers/usb/core/hcd.c line 133.

Not a big deal for your products, but someday you might find yourself building a
kernel of version a.b.c.d and wonder why it doesn't compile.


Version-Release number of selected component (if applicable):

kernel 2.6.9 specfile.

How reproducible:

Always.

Steps to Reproduce:
1. Try to build a newer kernel with sublevel 19.3 or 20.1.
2. rpmbuild -ba --target i686 kernel-2.6.spec
3.
  
Actual results:


Expected results:


Additional info: