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From:   Thomas Gleixner <tglx@linutronix.de>
To:     Peter Zijlstra <peterz@infradead.org>
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        "Paul E. McKenney" <paulmck@kernel.org>,
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        Sean Christopherson <sean.j.christopherson@intel.com>,
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        Petr Mladek <pmladek@suse.com>,
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        Brian Gerst <brgerst@gmail.com>,
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        Will Deacon <will@kernel.org>,
        Tom Lendacky <thomas.lendacky@amd.com>,
        Wei Liu <wei.liu@kernel.org>,
        Michael Kelley <mikelley@microsoft.com>,
        Jason Chen CJ <jason.cj.chen@intel.com>,
        Zhao Yakui <yakui.zhao@intel.com>
Subject: Re: [patch V6 00/37] x86/entry: Rework leftovers and merge plan
In-Reply-To: <20200518160750.GA279861@hirez.programming.kicks-ass.net>
Date:   Mon, 18 May 2020 22:24:53 +0200
Message-ID: <87367xvvmy.fsf@nanos.tec.linutronix.de>
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Peter Zijlstra <peterz@infradead.org> writes:
> So on top of you entry-v8-full; I had to chase one of those
> instrumentation_end() escapes an (extended) basic block chase (again!).
>
> --- a/arch/x86/include/asm/bug.h
> +++ b/arch/x86/include/asm/bug.h
> @@ -79,8 +79,8 @@ do {								\
>  do {								\
>  	instrumentation_begin();				\
>  	_BUG_FLAGS(ASM_UD2, BUGFLAG_WARNING|(flags));		\
> -	instrumentation_end();					\
>  	annotate_reachable();					\
> +	instrumentation_end();					\
>  } while (0)

I just applied this part and rebuilt:

 vmlinux.o: warning: objtool: rcu_eqs_enter.constprop.77()+0xa9: call to
 rcu_preempt_deferred_qs() leaves .noinstr.text section

Did it go away after you disabled DEBUG_ENTRY perhaps?