linux-kernel - [RFC][PATCH v2 24/29] kernel/vmcore_info: Register dynamic information into Kmemdump

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Message-ID: <20250724135512.518487-25-eugen.hristev@linaro.org>
Date: Thu, 24 Jul 2025 16:55:07 +0300
From: Eugen Hristev <eugen.hristev@...aro.org>
To: linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	linux-arch@...r.kernel.org,
	linux-mm@...ck.org,
	tglx@...utronix.de,
	andersson@...nel.org,
	pmladek@...e.com
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-hardening@...r.kernel.org,
	eugen.hristev@...aro.org,
	corbet@....net,
	mojha@....qualcomm.com,
	rostedt@...dmis.org,
	jonechou@...gle.com,
	tudor.ambarus@...aro.org
Subject: [RFC][PATCH v2 24/29] kernel/vmcore_info: Register dynamic information into Kmemdump

Register vmcoreinfo information into kmemdump.
Because the size of the info is computed after all entries are being
added, there is no point in registering the whole page, rather, call
the kmemdump registration once everything is in place with the right size.
A second reason is that the vmcoreinfo is added as a region inside
the ELF coreimage note, there is no point in having blank space at the end.

Signed-off-by: Eugen Hristev <eugen.hristev@...aro.org>
---
 kernel/vmcore_info.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/vmcore_info.c b/kernel/vmcore_info.c
index e066d31d08f8..d808c5e67f35 100644
--- a/kernel/vmcore_info.c
+++ b/kernel/vmcore_info.c
@@ -14,6 +14,7 @@
 #include <linux/cpuhotplug.h>
 #include <linux/memblock.h>
 #include <linux/kmemleak.h>
+#include <linux/kmemdump.h>
 
 #include <asm/page.h>
 #include <asm/sections.h>
@@ -227,6 +228,8 @@ static int __init crash_save_vmcoreinfo_init(void)
 	arch_crash_save_vmcoreinfo();
 	update_vmcoreinfo_note();
 
+	kmemdump_register_id(KMEMDUMP_ID_COREIMAGE_VMCOREINFO,
+			     (void *)vmcoreinfo_data, vmcoreinfo_size);
 	return 0;
 }
 
-- 
2.43.0