linux-kernel - [PATCH] vmcoreinfo: make hwerr

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Message-Id: <20260121-fix_vmcoreinfo-v1-1-39e96fab670e@debian.org>
Date: Wed, 21 Jan 2026 03:05:44 -0800
From: Breno Leitao <leitao@...ian.org>
To: akpm@...ux-foundation.org, bhe@...hat.com
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, Breno Leitao <leitao@...ian.org>
Subject: [PATCH] vmcoreinfo: make hwerr_data visible for debugging

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.

Signed-off-by: Breno Leitao <leitao@...ian.org>
---
 kernel/vmcore_info.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/vmcore_info.c b/kernel/vmcore_info.c
index 22b3205dd4dc5..1f42818f77cef 100644
--- a/kernel/vmcore_info.c
+++ b/kernel/vmcore_info.c
@@ -36,7 +36,7 @@ struct hwerr_info {
 	time64_t timestamp;
 };
 
-static struct hwerr_info hwerr_data[HWERR_RECOV_MAX];
+struct hwerr_info hwerr_data[HWERR_RECOV_MAX];
 
 Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type,
 			  void *data, size_t data_len)

---
base-commit: 053966c344dbd346e71305f530e91ea77916189f
change-id: 20260121-fix_vmcoreinfo-01592f705a77

Best regards,
--  
Breno Leitao <leitao@...ian.org>