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

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Date:	Thu, 26 Nov 2009 19:53:48 +0800
From:	Xiaotian Feng <dfeng@...hat.com>
To:	x86@...nel.org
Cc:	linux-kernel@...r.kernel.org, Xiaotian Feng <dfeng@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
Subject: [PATCH -tip] x86/pat: trivial: don't create debugfs for memtype if pat is disabled

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@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Suresh Siddha <suresh.b.siddha@...el.com>
Cc: Venkatesh Pallipadi <venkatesh.pallipadi@...el.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

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