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Subject[PATCH] proc: spread __ro_after_init
/proc/self inode numbers, value of proc_inode_cache and st_nlink of
/proc/$TGID are fixed constants.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
---

fs/proc/base.c | 5 +++--
fs/proc/inode.c | 3 ++-
fs/proc/self.c | 3 ++-
fs/proc/thread_self.c | 3 ++-
4 files changed, 9 insertions(+), 5 deletions(-)

--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -75,6 +75,7 @@
#include <linux/ptrace.h>
#include <linux/tracehook.h>
#include <linux/printk.h>
+#include <linux/cache.h>
#include <linux/cgroup.h>
#include <linux/cpuset.h>
#include <linux/audit.h>
@@ -112,8 +113,8 @@
* in /proc for a task before it execs a suid executable.
*/

-static u8 nlink_tid;
-static u8 nlink_tgid;
+static u8 nlink_tid __ro_after_init;
+static u8 nlink_tgid __ro_after_init;

struct pid_entry {
const char *name;
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -5,6 +5,7 @@
* Copyright (C) 1991, 1992 Linus Torvalds
*/

+#include <linux/cache.h>
#include <linux/time.h>
#include <linux/proc_fs.h>
#include <linux/kernel.h>
@@ -52,7 +53,7 @@ static void proc_evict_inode(struct inode *inode)
}
}

-static struct kmem_cache * proc_inode_cachep;
+static struct kmem_cache *proc_inode_cachep __ro_after_init;

static struct inode *proc_alloc_inode(struct super_block *sb)
{
--- a/fs/proc/self.c
+++ b/fs/proc/self.c
@@ -1,4 +1,5 @@
// SPDX-License-Identifier: GPL-2.0
+#include <linux/cache.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/pid_namespace.h>
@@ -30,7 +31,7 @@ static const struct inode_operations proc_self_inode_operations = {
.get_link = proc_self_get_link,
};

-static unsigned self_inum;
+static unsigned self_inum __ro_after_init;

int proc_setup_self(struct super_block *s)
{
--- a/fs/proc/thread_self.c
+++ b/fs/proc/thread_self.c
@@ -1,4 +1,5 @@
// SPDX-License-Identifier: GPL-2.0
+#include <linux/cache.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/pid_namespace.h>
@@ -30,7 +31,7 @@ static const struct inode_operations proc_thread_self_inode_operations = {
.get_link = proc_thread_self_get_link,
};

-static unsigned thread_self_inum;
+static unsigned thread_self_inum __ro_after_init;

int proc_setup_thread_self(struct super_block *s)
{
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