linux-kernel - [PATCH 4/5] mm: add numa node symlink for cpu devices in sysfs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 19 Oct 2009 15:34:30 -0600
From:	Alex Chiang <achiang@...com>
To:	akpm@...ux-foundation.org
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH 4/5] mm: add numa node symlink for cpu devices in sysfs

You can discover which CPUs belong to a NUMA node by examining
/sys/devices/system/node/$node/

However, it's not convenient to go in the other direction, when looking at
/sys/devices/system/cpu/$cpu/

Yes, you can muck about in sysfs, but adding these symlinks makes
life a lot more convenient.

Signed-off-by: Alex Chiang <achiang@...com>
---

 drivers/base/node.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/drivers/base/node.c b/drivers/base/node.c
index ffda067..47a4997 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -227,6 +227,7 @@ struct node node_devices[MAX_NUMNODES];
  */
 int register_cpu_under_node(unsigned int cpu, unsigned int nid)
 {
+	int ret;
 	struct sys_device *obj;
 
 	if (!node_online(nid))
@@ -236,9 +237,13 @@ int register_cpu_under_node(unsigned int cpu, unsigned int nid)
 	if (!obj)
 		return 0;
 
-	return sysfs_create_link(&node_devices[nid].sysdev.kobj,
+	ret = sysfs_create_link(&node_devices[nid].sysdev.kobj,
 				&obj->kobj,
 				kobject_name(&obj->kobj));
+
+	return sysfs_create_link(&obj->kobj,
+				 &node_devices[nid].sysdev.kobj,
+				 kobject_name(&node_devices[nid].sysdev.kobj));
 }
 
 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
@@ -254,6 +259,8 @@ int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
 
 	sysfs_remove_link(&node_devices[nid].sysdev.kobj,
 			  kobject_name(&obj->kobj));
+	sysfs_remove_link(&obj->kobj,
+			  kobject_name(&node_devices[nid].sysdev.kobj));
 
 	return 0;
 }

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/