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

From: Stephen Rothwell <[email-masked]>
Date: Thu, 21 Oct 2021 14:03:40 +1100

Hi all,

On Mon, 20 Sep 2021 11:38:09 +1000 Stephen Rothwell <[email-masked]> wrote:
>
> On Fri, 17 Sep 2021 11:58:59 +1000 Stephen Rothwell <[email-masked]> 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