linux-kernel - Re: [patch V6 00/37] x86/entry: Rework leftovers and merge plan

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Message-ID: <87367xvvmy.fsf@nanos.tec.linutronix.de>
Date:   Mon, 18 May 2020 22:24:53 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Brian Gerst <brgerst@...il.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Will Deacon <will@...nel.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        Wei Liu <wei.liu@...nel.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        Jason Chen CJ <jason.cj.chen@...el.com>,
        Zhao Yakui <yakui.zhao@...el.com>
Subject: Re: [patch V6 00/37] x86/entry: Rework leftovers and merge plan

Peter Zijlstra <peterz@...radead.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?