linux-hardening - [RFC][PATCH v2 18/29] mm/percpu: Annotate static information into Kmemdump

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Message-ID: <20250724135512.518487-19-eugen.hristev@linaro.org>
Date: Thu, 24 Jul 2025 16:55:01 +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 18/29] mm/percpu: Annotate static information into Kmemdump

Annotate vital static information into kmemdump:
 - __per_cpu_offset

Information on these variables is stored into dedicated kmemdump section.

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

diff --git a/mm/percpu.c b/mm/percpu.c
index d9cbaee92b60..0cfe4d7818e9 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -87,6 +87,7 @@
 #include <linux/sched.h>
 #include <linux/sched/mm.h>
 #include <linux/memcontrol.h>
+#include <linux/kmemdump.h>
 
 #include <asm/cacheflush.h>
 #include <asm/sections.h>
@@ -3342,6 +3343,8 @@ void __init setup_per_cpu_areas(void)
 
 #endif	/* CONFIG_SMP */
 
+KMEMDUMP_VAR_CORE(__per_cpu_offset, sizeof(__per_cpu_offset));
+
 /*
  * pcpu_nr_pages - calculate total number of populated backing pages
  *
-- 
2.43.0