[PATCH v3 5/5] sysctl: delete six_hundred_forty_kb to save 4 bytes

[Wen Yang]

By directly encoding specific numbers into the min/max field,
unnecessary global variable six_hundred_forty_kb can be removed,
saving 4 bytes

Signed-off-by: Wen Yang <wen.yang@xxxxxxxxx>
Cc: Luis Chamberlain <mcgrof@xxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Joel Granados <j.granados@xxxxxxxxxxx>
Cc: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
Cc: Christian Brauner <brauner@xxxxxxxxxx>
Cc: Dave Young <dyoung@xxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
 kernel/sysctl.c | 13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 05197d46007d..7affb1ad7065 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -90,13 +90,6 @@ EXPORT_SYMBOL_GPL(sysctl_long_vals);
 
 #if defined(CONFIG_SYSCTL)
 
-/* Constants used for minimum and maximum */
-
-#ifdef CONFIG_PERF_EVENTS
-static const int six_hundred_forty_kb = 640 * 1024;
-#endif
-
-
 static const int ngroups_max = NGROUPS_MAX;
 static const int cap_last_cap = CAP_LAST_CAP;
 
@@ -1964,10 +1957,10 @@ static struct ctl_table kern_table[] = {
 		.procname	= "perf_event_max_stack",
 		.data		= &sysctl_perf_event_max_stack,
 		.maxlen		= sizeof(sysctl_perf_event_max_stack),
-		.mode		= 0644,
+		.mode		= 0644 | SYSCTL_FLAG_MIN | SYSCTL_FLAG_MAX,
 		.proc_handler	= perf_event_max_stack_handler,
-		.extra1		= SYSCTL_ZERO,
-		.extra2		= (void *)&six_hundred_forty_kb,
+		.min		= SYSCTL_NUM_ZERO,
+		.max		= 640 * 1024,
 	},
 	{
 		.procname	= "perf_event_max_contexts_per_stack",
-- 
2.25.1