[PATCH] sysctl: vm.drop_caches should be writable only

[Denis Cheng <crquan@gmail.com>]

This file's functionality is to tell the system to do a cache reclaiming,
the possible value to write to it is only 1, 2 or 3, reading from it will
get the last value written to it, that's meaingless.

Signed-off-by: Denis Cheng <crquan@gmail.com>
---
Reference to 7e3e0360, which also changed some sysctl value from 0644 to 0200.

 kernel/sysctl.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index b2a2d68..f50926a 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -980,7 +980,7 @@ static struct ctl_table vm_table[] = {
 		.procname	= "drop_caches",
 		.data		= &sysctl_drop_caches,
 		.maxlen		= sizeof(int),
-		.mode		= 0644,
+		.mode		= 0200,
 		.proc_handler	= drop_caches_sysctl_handler,
 		.strategy	= &sysctl_intvec,
 	},
-- 
1.5.4.4