linux-hardening - [RFC][PATCH v2 17/29] mm/swapfile: Annotate static information into Kmemdump

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Message-ID: <20250724135512.518487-18-eugen.hristev@linaro.org>
Date: Thu, 24 Jul 2025 16:55:00 +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 17/29] mm/swapfile: Annotate static information into Kmemdump

Annotate vital static information into kmemdump:
 - nr_swapfiles

Information on these variables is stored into dedicated kmemdump section.

Signed-off-by: Eugen Hristev <eugen.hristev@...aro.org>
---
 mm/swapfile.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index b4f3cc712580..ac5a2307a278 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -42,6 +42,7 @@
 #include <linux/suspend.h>
 #include <linux/zswap.h>
 #include <linux/plist.h>
+#include <linux/kmemdump.h>
 
 #include <asm/tlbflush.h>
 #include <linux/swapops.h>
@@ -64,6 +65,7 @@ static inline void unlock_cluster(struct swap_cluster_info *ci);
 
 static DEFINE_SPINLOCK(swap_lock);
 static unsigned int nr_swapfiles;
+KMEMDUMP_VAR_CORE(nr_swapfiles, sizeof(nr_swapfiles));
 atomic_long_t nr_swap_pages;
 /*
  * Some modules use swappable objects and may try to swap them out under
-- 
2.43.0