linux-kernel - [PATCH 10/13] eventpoll: simplify sysctl declaration with register_sysctl

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Message-Id: <20200529074108.16928-11-mcgrof@kernel.org>
Date:   Fri, 29 May 2020 07:41:05 +0000
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     keescook@...omium.org, yzaikin@...gle.com, nixiaoming@...wei.com,
        ebiederm@...ssion.com, axboe@...nel.dk, clemens@...isch.de,
        arnd@...db.de, gregkh@...uxfoundation.org,
        jani.nikula@...ux.intel.com, joonas.lahtinen@...ux.intel.com,
        rodrigo.vivi@...el.com, airlied@...ux.ie, daniel@...ll.ch,
        benh@...nel.crashing.org, rdna@...com, viro@...iv.linux.org.uk,
        mark@...heh.com, jlbec@...lplan.org, joseph.qi@...ux.alibaba.com,
        vbabka@...e.cz, sfr@...b.auug.org.au, jack@...e.cz,
        amir73il@...il.com, rafael@...nel.org, tytso@....edu
Cc:     julia.lawall@...6.fr, akpm@...ux-foundation.org,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linuxppc-dev@...ts.ozlabs.org, ocfs2-devel@....oracle.com,
        linux-kernel@...r.kernel.org, Luis Chamberlain <mcgrof@...nel.org>
Subject: [PATCH 10/13] eventpoll: simplify sysctl declaration with register_sysctl_subdir()

From: Xiaoming Ni <nixiaoming@...wei.com>

Move epoll_table sysctl to fs/eventpoll.c and remove the
clutter out of kernel/sysctl.c by using register_sysctl_subdir()..

Signed-off-by: Xiaoming Ni <nixiaoming@...wei.com>
Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
---
 fs/eventpoll.c         | 10 +++++++++-
 include/linux/poll.h   |  2 --
 include/linux/sysctl.h |  1 -
 kernel/sysctl.c        |  7 -------
 4 files changed, 9 insertions(+), 11 deletions(-)

diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 12eebcdea9c8..957ebc9700e3 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -299,7 +299,7 @@ static LIST_HEAD(tfile_check_list);
 static long long_zero;
 static long long_max = LONG_MAX;
 
-struct ctl_table epoll_table[] = {
+static struct ctl_table epoll_table[] = {
 	{
 		.procname	= "max_user_watches",
 		.data		= &max_user_watches,
@@ -311,6 +311,13 @@ struct ctl_table epoll_table[] = {
 	},
 	{ }
 };
+
+static void __init epoll_sysctls_init(void)
+{
+	register_sysctl_subdir("fs", "epoll", epoll_table);
+}
+#else
+#define epoll_sysctls_init() do { } while (0)
 #endif /* CONFIG_SYSCTL */
 
 static const struct file_operations eventpoll_fops;
@@ -2422,6 +2429,7 @@ static int __init eventpoll_init(void)
 	/* Allocates slab cache used to allocate "struct eppoll_entry" */
 	pwq_cache = kmem_cache_create("eventpoll_pwq",
 		sizeof(struct eppoll_entry), 0, SLAB_PANIC|SLAB_ACCOUNT, NULL);
+	epoll_sysctls_init();
 
 	return 0;
 }
diff --git a/include/linux/poll.h b/include/linux/poll.h
index 1cdc32b1f1b0..a9e0e1c2d1f2 100644
--- a/include/linux/poll.h
+++ b/include/linux/poll.h
@@ -8,12 +8,10 @@
 #include <linux/wait.h>
 #include <linux/string.h>
 #include <linux/fs.h>
-#include <linux/sysctl.h>
 #include <linux/uaccess.h>
 #include <uapi/linux/poll.h>
 #include <uapi/linux/eventpoll.h>
 
-extern struct ctl_table epoll_table[]; /* for sysctl */
 /* ~832 bytes of stack space used max in sys_select/sys_poll before allocating
    additional memory. */
 #ifdef __clang__
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index aa01f54d0442..e5364b69dd95 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -217,7 +217,6 @@ extern int no_unaligned_warning;
 
 extern struct ctl_table sysctl_mount_point[];
 extern struct ctl_table random_table[];
-extern struct ctl_table epoll_table[];
 
 #else /* CONFIG_SYSCTL */
 static inline struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index e007375c8a11..5c116904feb7 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -3001,13 +3001,6 @@ static struct ctl_table fs_table[] = {
 		.proc_handler	= proc_dointvec,
 	},
 #endif
-#ifdef CONFIG_EPOLL
-	{
-		.procname	= "epoll",
-		.mode		= 0555,
-		.child		= epoll_table,
-	},
-#endif
 #endif
 	{
 		.procname	= "protected_symlinks",
-- 
2.26.2