linux-kernel - [PATCH 04/12] mm: move randomize_va

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Message-Id: <20250509-jag-mv_ctltables_iter2-v1-4-d0ad83f5f4c3@kernel.org>
Date: Fri, 09 May 2025 14:54:08 +0200
From: Joel Granados <joel.granados@...nel.org>
To: Luis Chamberlain <mcgrof@...nel.org>, Petr Pavlu <petr.pavlu@...e.com>, 
 Sami Tolvanen <samitolvanen@...gle.com>, 
 Daniel Gomez <da.gomez@...sung.com>, Kees Cook <kees@...nel.org>, 
 Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
 Will Deacon <will@...nel.org>, Boqun Feng <boqun.feng@...il.com>, 
 Waiman Long <longman@...hat.com>, "Paul E. McKenney" <paulmck@...nel.org>, 
 Frederic Weisbecker <frederic@...nel.org>, 
 Neeraj Upadhyay <neeraj.upadhyay@...nel.org>, 
 Joel Fernandes <joel@...lfernandes.org>, 
 Josh Triplett <josh@...htriplett.org>, Uladzislau Rezki <urezki@...il.com>, 
 Steven Rostedt <rostedt@...dmis.org>, 
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, 
 Lai Jiangshan <jiangshanlai@...il.com>, Zqiang <qiang.zhang1211@...il.com>, 
 Andrew Morton <akpm@...ux-foundation.org>, 
 "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>, 
 Helge Deller <deller@....de>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Jiri Slaby <jirislaby@...nel.org>
Cc: linux-modules@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-fsdevel@...r.kernel.org, rcu@...r.kernel.org, linux-mm@...ck.org, 
 linux-parisc@...r.kernel.org, linux-serial@...r.kernel.org, 
 Joel Granados <joel.granados@...nel.org>
Subject: [PATCH 04/12] mm: move randomize_va_space into memory.c

Move the randomize_va_space variable together with all its sysctl table
elements into memory.c. Register it to the "kernel" directory by
adding it to the subsys initialization calls

This is part of a greater effort to move ctl tables into their
respective subsystems which will reduce the merge conflicts in
kernel/sysctl.c.

Signed-off-by: Joel Granados <joel.granados@...nel.org>
---
 kernel/sysctl.c |  9 ---------
 mm/memory.c     | 18 ++++++++++++++++++
 2 files changed, 18 insertions(+), 9 deletions(-)

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index fd76f0e1d490940a67d72403d72d204ff13d888a..adc2d3ea127841d87b7073ed81d6121c9a60e59a 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1688,15 +1688,6 @@ static const struct ctl_table kern_table[] = {
 		.proc_handler	= proc_dointvec,
 	},
 #endif
-#if defined(CONFIG_MMU)
-	{
-		.procname	= "randomize_va_space",
-		.data		= &randomize_va_space,
-		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec,
-	},
-#endif
 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
 	{
 		.procname	= "ignore-unaligned-usertrap",
diff --git a/mm/memory.c b/mm/memory.c
index ba3ea0a82f7f770b6cacba4526ba9c8c4929ddad..0a9e325fe3d7631e619ab58d79785cc92fd60c29 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -125,6 +125,24 @@ int randomize_va_space __read_mostly =
 					2;
 #endif

+static const struct ctl_table mmu_sysctl_table[] = {
+	{
+		.procname	= "randomize_va_space",
+		.data		= &randomize_va_space,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+	},
+};
+
+static int __init init_mm_sysctl(void)
+{
+	register_sysctl_init("kernel", mmu_sysctl_table);
+	return 0;
+}
+
+subsys_initcall(init_mm_sysctl);
+
 #ifndef arch_wants_old_prefaulted_pte
 static inline bool arch_wants_old_prefaulted_pte(void)
 {

-- 
2.47.2