linux-kernel - next-20190125 - objtool complains about dumpstack

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Date:   Sun, 27 Jan 2019 22:45:03 -0500
From:   valdis.kletnieks@...edu
To:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
cc:     linux-kernel@...r.kernel.org
Subject: next-20190125 - objtool complains about dumpstack

Seen in a build:

  CC      arch/x86/kernel/dumpstack.o
arch/x86/kernel/dumpstack.o: warning: objtool: oops_begin()+0x9: undefined stack state
arch/x86/kernel/dumpstack.o: warning: objtool: oops_begin()+0x0: stack state mismatch: cfa1=6+16 cfa2=7+8

Probably a gcc9 code generation that objtool doesn't know about?