linux-kernel - Re: linux-next: build warning after merge of the tip tree

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Message-ID: <20211021140340.139eab65@canb.auug.org.au>
Date:   Thu, 21 Oct 2021 14:03:40 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
        "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build warning after merge of the tip tree

Hi all,

On Mon, 20 Sep 2021 11:38:09 +1000 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> On Fri, 17 Sep 2021 11:58:59 +1000 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> >
> > After merging the tip tree, today's linux-next build (x86_64 allmodconfig)
> > produced this warning:
> > 
> > vmlinux.o: warning: objtool: mce_setup()+0x22: call to memset() leaves .noinstr.text section
> > vmlinux.o: warning: objtool: do_machine_check()+0x51: call to mce_gather_info() leaves .noinstr.text section
> > vmlinux.o: warning: objtool: rcu_dynticks_eqs_enter()+0x0: call to rcu_dynticks_task_trace_enter() leaves .noinstr.text section
> > vmlinux.o: warning: objtool: rcu_dynticks_eqs_exit()+0xe: call to rcu_dynticks_task_trace_exit() leaves .noinstr.text section
> > vmlinux.o: warning: objtool: rcu_nmi_enter()+0x36: call to __kasan_check_read() leaves .noinstr.text section  
> 
> Today, we added these:
> 
> vmlinux.o: warning: objtool: xen_irq_disable()+0xa: call to preempt_count_add() leaves .noinstr.text section
> vmlinux.o: warning: objtool: xen_irq_enable()+0xb: call to preempt_count_add() leaves .noinstr.text section
> vmlinux.o: warning: objtool: check_preemption_disabled()+0x81: call to is_percpu_thread() leaves .noinstr.text section
> 
> and the rcu_nmi_enter one changed to:
> 
> vmlinux.o: warning: objtool: rcu_nmi_enter()+0x5d: call to __kasan_check_read() leaves .noinstr.text section

Currently, I am getting these:

vmlinux.o: warning: objtool: xen_irq_disable()+0xa: call to preempt_count_add() leaves .noinstr.text section
vmlinux.o: warning: objtool: xen_irq_enable()+0xb: call to preempt_count_add() leaves .noinstr.text section
vmlinux.o: warning: objtool: mce_setup()+0x22: call to memset() leaves .noinstr.text section
vmlinux.o: warning: objtool: do_machine_check()+0x99: call to mce_gather_info() leaves .noinstr.text section

(the rcu ones are gone once I merge the rcu tree)
-- 
Cheers,
Stephen Rothwell

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