slub: register slabinfo to procfs

We need to register slabinfo to procfs when CONFIG_SLUB is enabled to
make the file actually visible to user-space.

Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c
index e0d064e9764e..a11968bc0516 100644
--- a/fs/proc/proc_misc.c
+++ b/fs/proc/proc_misc.c
@@ -451,6 +451,20 @@ static const struct file_operations proc_slabstats_operations = {
 #endif
 #endif
 
+#ifdef CONFIG_SLUB
+static int slabinfo_open(struct inode *inode, struct file *file)
+{
+        return seq_open(file, &slabinfo_op);
+}
+
+static const struct file_operations proc_slabinfo_operations = {
+        .open           = slabinfo_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = seq_release,
+};
+#endif
+
 static int show_stat(struct seq_file *p, void *v)
 {
         int i;
@@ -734,6 +748,9 @@ void __init proc_misc_init(void)
         create_seq_entry("slab_allocators", 0 ,&proc_slabstats_operations);
 #endif
 #endif
+#ifdef CONFIG_SLUB
+        create_seq_entry("slabinfo", S_IWUSR|S_IRUGO, &proc_slabinfo_operations);
+#endif
         create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
         create_seq_entry("pagetypeinfo", S_IRUGO, &pagetypeinfo_file_ops);
         create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);