[PATCH v4 9/10] mm/hwpoison: change permission of corrupt-pfn/unpoison-pfn to 0400

[Wanpeng Li <liwanp@linux.vnet.ibm.com>]

Hwpoison inject doesn't implement read method for corrupt-pfn/unpoison-pfn
attributes:

# cat /sys/kernel/debug/hwpoison/corrupt-pfn 
cat: /sys/kernel/debug/hwpoison/corrupt-pfn: Permission denied
# cat /sys/kernel/debug/hwpoison/unpoison-pfn 
cat: /sys/kernel/debug/hwpoison/unpoison-pfn: Permission denied

This patch change the permission of corrupt-pfn/unpoison-pfn to 0400.

Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
---
 mm/hwpoison-inject.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/hwpoison-inject.c b/mm/hwpoison-inject.c
index 3a61efc..8b77bfd 100644
--- a/mm/hwpoison-inject.c
+++ b/mm/hwpoison-inject.c
@@ -88,12 +88,12 @@ static int pfn_inject_init(void)
 	 * hardware status change, hence do not require hardware support.
 	 * They are mainly for testing hwpoison in software level.
 	 */
-	dentry = debugfs_create_file("corrupt-pfn", 0600, hwpoison_dir,
+	dentry = debugfs_create_file("corrupt-pfn", 0400, hwpoison_dir,
 					  NULL, &hwpoison_fops);
 	if (!dentry)
 		goto fail;
 
-	dentry = debugfs_create_file("unpoison-pfn", 0600, hwpoison_dir,
+	dentry = debugfs_create_file("unpoison-pfn", 0400, hwpoison_dir,
 				     NULL, &unpoison_fops);
 	if (!dentry)
 		goto fail;
-- 
1.8.1.2

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