From: Borislav Petkov <bp@alien8.de>
To: Tony Luck <tony.luck@intel.com>
Cc: X86 ML <x86@kernel.org>, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v0 05/12] x86/mce: Allow instrumentation during task work queueing
Date: Tue, 9 Nov 2021 23:05:04 +0100 [thread overview]
Message-ID: <YYrwkKANAz/Qj17f@zn.tnic> (raw)
In-Reply-To: <20211104144035.20107-6-bp@alien8.de>
On Thu, Nov 04, 2021 at 03:40:28PM +0100, Borislav Petkov wrote:
> From: Borislav Petkov <bp@suse.de>
>
> Fixes
>
> vmlinux.o: warning: objtool: do_machine_check()+0xdb1: call to queue_task_work() leaves .noinstr.text section
>
> Signed-off-by: Borislav Petkov <bp@suse.de>
> ---
> arch/x86/kernel/cpu/mce/core.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
> index c7181e8e2845..65a8be420aff 100644
> --- a/arch/x86/kernel/cpu/mce/core.c
> +++ b/arch/x86/kernel/cpu/mce/core.c
> @@ -1451,6 +1451,8 @@ noinstr void do_machine_check(struct pt_regs *regs)
> if (worst != MCE_AR_SEVERITY && !kill_current_task)
> goto out;
>
> + instrumentation_begin();
<peterz> so it might be nice to have a comment with each sandwich to
say why sh*t won't go sideways when instrumentation happens in the #MC
at that point
<peterz> like this shuts things up, but really we don't want
instrumentation here either, except blah
note to self: will need to go through the whole set.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
next prev parent reply other threads:[~2021-11-09 22:05 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-04 14:40 [PATCH v0 00/12] x86/mce: Correct the noinstr annotation Borislav Petkov
2021-11-04 14:40 ` [PATCH v0 01/12] x86/mce: Do not use memset to clear the banks bitmaps Borislav Petkov
2021-11-04 14:40 ` [PATCH v0 02/12] x86/mce: Remove function-local cpus variables Borislav Petkov
2021-11-04 14:40 ` [PATCH v0 03/12] x86/mce: Use mce_rdmsrl() in severity checking code Borislav Petkov
2021-11-04 14:40 ` [PATCH v0 04/12] x86/mce: Remove noinstr annotation from mce_setup() Borislav Petkov
2021-11-04 14:40 ` [PATCH v0 05/12] x86/mce: Allow instrumentation during task work queueing Borislav Petkov
2021-11-09 22:05 ` Borislav Petkov [this message]
2021-11-04 14:40 ` [PATCH v0 06/12] x86/mce: Prevent severity computation from being instrumented Borislav Petkov
2021-11-04 14:40 ` [PATCH v0 07/12] x86/mce: Mark mce_panic() noinstr Borislav Petkov
2021-11-04 14:40 ` [PATCH v0 08/12] x86/mce: Mark mce_end() noinstr Borislav Petkov
2021-11-04 14:40 ` [PATCH v0 09/12] x86/mce: Mark mce_read_aux() noinstr Borislav Petkov
2021-11-04 14:40 ` [PATCH v0 10/12] x86/mce: Move the tainting outside of the noinstr region Borislav Petkov
2021-11-04 14:40 ` [PATCH v0 11/12] x86/mce: Mark mce_timed_out() noinstr Borislav Petkov
2021-11-04 14:40 ` [PATCH v0 12/12] x86/mce: Mark mce_start() noinstr Borislav Petkov
2021-11-09 22:08 ` [PATCH v0 00/12] x86/mce: Correct the noinstr annotation Peter Zijlstra
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