[tip:x86/uv] x86: prevent /sys/firmware/sgi_uv from being created on non-uv systems

[tip:x86/uv] x86: prevent /sys/firmware/sgi_uv from being created on non-uv systems

[Russ Anderson]

Commit-ID:  06aa05b307e8efbc278f201198e7cdf3877bc5c2
Gitweb:     http://git.kernel.org/tip/06aa05b307e8efbc278f201198e7cdf3877bc5c2
Author:     Russ Anderson <rja@sgi.com>
AuthorDate: Fri, 3 Apr 2009 17:24:23 -0500
Committer:  Ingo Molnar <mingo@elte.hu>
CommitDate: Wed, 8 Apr 2009 14:58:10 +0200

x86: prevent /sys/firmware/sgi_uv from being created on non-uv systems

/sys/firmware/sgi_uv should only be created on uv systems.

Signed-off-by: Russ Anderson <rja@sgi.com>
LKML-Reference: <20090403222423.GA28546@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>


---
 arch/x86/kernel/uv_sysfs.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/uv_sysfs.c b/arch/x86/kernel/uv_sysfs.c
index 67f9b9d..36afb98 100644
--- a/arch/x86/kernel/uv_sysfs.c
+++ b/arch/x86/kernel/uv_sysfs.c
@@ -21,6 +21,7 @@
 
 #include <linux/sysdev.h>
 #include <asm/uv/bios.h>
+#include <asm/uv/uv.h>
 
 struct kobject *sgi_uv_kobj;
 
@@ -47,6 +48,9 @@ static int __init sgi_uv_sysfs_init(void)
 {
 	unsigned long ret;
 
+	if (!is_uv_system())
+		return -ENODEV;
+
 	if (!sgi_uv_kobj)
 		sgi_uv_kobj = kobject_create_and_add("sgi_uv", firmware_kobj);
 	if (!sgi_uv_kobj) {