[PATCH -tip] x86/pat: trivial: don't create debugfs for memtype if pat is disabled

[Xiaotian Feng <dfeng@redhat.com>]

If pat is disabled (boot with nopat), there's no need to create
debugfs for it, it's empty all the time.

Signed-off-by: Xiaotian Feng <dfeng@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
---
 arch/x86/mm/pat.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index 01fc043..c37fd51 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -1014,8 +1014,9 @@ static const struct file_operations memtype_fops = {
 
 static int __init pat_memtype_list_init(void)
 {
-	debugfs_create_file("pat_memtype_list", S_IRUSR, arch_debugfs_dir,
-				NULL, &memtype_fops);
+	if (pat_enabled)
+		debugfs_create_file("pat_memtype_list", S_IRUSR,
+					arch_debugfs_dir, NULL, &memtype_fops);
 	return 0;
 }
 
-- 
1.6.5.2