linux-kernel - [PATCH] fs: move and constify sysctl_nr_open_min, sysctl_nr_open

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Date:   Wed, 11 Oct 2023 21:24:21 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     akpm@...ux-foundation.org
Cc:     linux-kernel@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>
Subject: [PATCH] fs: move and constify sysctl_nr_open_min, sysctl_nr_open_max

sysctl_nr_open_min, sysctl_nr_open_max variables are really hard limits
on fs.nr_open sysctl, they aren't interesting to the rest of the code
and are constants (sysctl_nr_open is not constant obviously).

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

 fs/file.c            |    5 -----
 fs/file_table.c      |   10 ++++++++--
 include/linux/file.h |    2 --
 3 files changed, 8 insertions(+), 9 deletions(-)

--- a/fs/file.c
+++ b/fs/file.c
@@ -25,11 +25,6 @@
 #include "internal.h"
 
 unsigned int sysctl_nr_open __read_mostly = 1024*1024;
-unsigned int sysctl_nr_open_min = BITS_PER_LONG;
-/* our min() is unusable in constant expressions ;-/ */
-#define __const_min(x, y) ((x) < (y) ? (x) : (y))
-unsigned int sysctl_nr_open_max =
-	__const_min(INT_MAX, ~(size_t)0/sizeof(void *)) & -BITS_PER_LONG;
 
 static void __free_fdtable(struct fdtable *fdt)
 {
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -111,6 +111,12 @@ static int proc_nr_files(struct ctl_table *table, int write, void *buffer,
 	return proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
 }
 
+static const unsigned int sysctl_nr_open_min = BITS_PER_LONG;
+/* our min() is unusable in constant expressions ;-/ */
+#define __const_min(x, y) ((x) < (y) ? (x) : (y))
+static const unsigned int sysctl_nr_open_max =
+	__const_min(INT_MAX, ~(size_t)0/sizeof(void *)) & -BITS_PER_LONG;
+
 static struct ctl_table fs_stat_sysctls[] = {
 	{
 		.procname	= "file-nr",
@@ -134,8 +140,8 @@ static struct ctl_table fs_stat_sysctls[] = {
 		.maxlen		= sizeof(unsigned int),
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_minmax,
-		.extra1		= &sysctl_nr_open_min,
-		.extra2		= &sysctl_nr_open_max,
+		.extra1		= (void *)&sysctl_nr_open_min,
+		.extra2		= (void *)&sysctl_nr_open_max,
 	},
 	{ }
 };
--- a/include/linux/file.h
+++ b/include/linux/file.h
@@ -113,6 +113,4 @@ int receive_fd_replace(int new_fd, struct file *file, unsigned int o_flags);
 extern void flush_delayed_fput(void);
 extern void __fput_sync(struct file *);
 
-extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max;
-
 #endif /* __LINUX_FILE_H */