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Subjectnext-20190125 - objtool complains about dumpstack
Date
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?

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