[tip:locking/core 2/4] make[2]: *** No rule to make target 'arch/x86/um/../lib/rwsem.o', needed by 'arch/x86/um/built-in.a'.

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git locking/core
head:   0975e3df30eb5849284c01be66c2ec16d8a48114
commit: 701fd16f3b4e3e5f317a051b36962b8cc756c138 [2/4] locking/rwsem: Remove arch specific rwsem files
config: um-defconfig (attached as .config)
compiler: gcc-7 (Debian 7.4.0-8) 7.4.0
reproduce:
        git checkout 701fd16f3b4e3e5f317a051b36962b8cc756c138
        # save the attached .config to linux build tree
        make ARCH=um 

All errors (new ones prefixed by >>):

>> make[2]: *** No rule to make target 'arch/x86/um/../lib/rwsem.o', needed by 'arch/x86/um/built-in.a'.
   make[2]: Target '__build' not remade because of errors.

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Attachment: .config.gz
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