linux-kernel - Re: [PATCH v2] vmcoreinfo: make hwerr

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Message-ID: <aXM98dIWmxBZgEO8@gmail.com>
Date: Fri, 23 Jan 2026 01:24:17 -0800
From: Breno Leitao <leitao@...ian.org>
To: Baoquan He <bhe@...hat.com>
Cc: akpm@...ux-foundation.org, vgoyal@...hat.com, dyoung@...hat.com, 
	xueshuai@...ux.alibaba.com, tony.luck@...el.com, linux-kernel@...r.kernel.org, 
	osandov@...ndov.com, kernel-team@...a.com
Subject: Re: [PATCH v2] vmcoreinfo: make hwerr_data visible for debugging

Hello Baoquan,

On Fri, Jan 23, 2026 at 08:19:40AM +0800, Baoquan He wrote:
> On 01/22/26 at 02:39am, Breno Leitao wrote:
> > If the kernel is compiled with LTO, hwerr_data symbol might be lost, and
> > vmcoreinfo doesn't have it dumped. This is currently seen in some
> > production kernels with LTO enabled.
> > 
> > Remove the static qualifier from hwerr_data so that the information is
> > still preserved when the kernel is built with LTO. Making hwerr_data
> > a global symbol ensures its debug info survives the LTO link process and
> > appears in kallsyms. Also document it, so, it doesn't get removed in the
> > future as suggested by akpm.
> > 
> > Signed-off-by: Breno Leitao <leitao@...ian.org>
> > ---
> > Changes in v2:
> > - Add a comment to explain why the array is global (akpm)
> > - Link to v1: https://patch.msgid.link/20260121-fix_vmcoreinfo-v1-1-39e96fab670e@debian.org
> > ---
> >  kernel/vmcore_info.c | 6 +++++-
> >  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> LGTM,
> 
> Acked-by: Baoquan He <bhe@...hat.com>
> 
> BTW, is it worth a 'Fixes' tag?

I am not sure, but, if we prefer to, this is the correct tag:

Fixes: 3fa805c37dd4d ("vmcoreinfo: track and log recoverable hardware errors")

Thanks for the review,
--breno