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

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Message-ID: <aXQnY4izGQUgvFvk@MiWiFi-R3L-srv>
Date: Sat, 24 Jan 2026 09:58:59 +0800
From: Baoquan He <bhe@...hat.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
	Breno Leitao <leitao@...ian.org>
Cc: 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

On 01/23/26 at 04:49pm, Andrew Morton wrote:
> On Fri, 23 Jan 2026 01:24:17 -0800 Breno Leitao <leitao@...ian.org> wrote:
> 
> > 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")
> 
> 3fa805c37dd4d was added in 6.19-rc1, so this patch is a fixup against
> this rc series.  So yes, it should go into 6.19-rcX also.

Ah, then no need. thanks.