linux-kernel - Re: vmlinux.o: warning: objtool: do_machine_check()+0x5fa: call to memset() leaves .noinstr.text section

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Date:   Wed, 19 Jan 2022 11:15:23 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Borislav Petkov <bp@...e.de>
Cc:     kernel test robot <lkp@...el.com>,
        "Paul E. McKenney" <paulmck@...nel.org>, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: Re: vmlinux.o: warning: objtool: do_machine_check()+0x5fa: call to
 memset() leaves .noinstr.text section

On Wed, 19 Jan 2022 10:40:17 -0800 Jakub Kicinski wrote:
> On Wed, 19 Jan 2022 19:34:24 +0100 Borislav Petkov wrote:
> > Hmm, weird. The set which is supposed to address this got merged last
> > week:
> > 
> > 7e740ae63504 ("Merge tag 'ras_core_for_v5.17_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip")
> > 
> > How exactly can I reproduce what you're seeing?
> > 
> > I need to merge which commit into which branch and then use which
> > .config to reproduce?  
> 
> allmodconfig 
> 
> Merge: 1d1df41c5a33 ff9fc0a31d85
> 
> 1d1df41c5a33 is linux/master 
> ff9fc0a31d85 is
> git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git master
> 
> I see:
> 
> vmlinux.o: warning: objtool: mce_start()+0x5e: call to __kasan_check_write() leaves .noinstr.text section
> vmlinux.o: warning: objtool: mce_gather_info()+0x5f: call to v8086_mode.isra.1() leaves .noinstr.text section
> vmlinux.o: warning: objtool: mce_read_aux()+0x8a: call to mca_msr_reg() leaves .noinstr.text section
> vmlinux.o: warning: objtool: do_machine_check()+0x196: call to mce_no_way_out() leaves .noinstr.text section
> vmlinux.o: warning: objtool: mce_severity_amd.constprop.1()+0xd1: call to mce_severity_amd_smca.isra.0() leaves .noinstr.text section
> 
> Let me try again with a clean check out.

Indeed, still present with a fresh tree.