linux-kernel - [PATCH] livepatch: old_name@..._addr scheme in livepatch sysfs directory

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Date:	Fri, 30 Oct 2015 22:44:08 -0500
From:	Chris J Arges <chris.j.arges@...onical.com>
To:	live-patching@...r.kernel.org
Cc:	Chris J Arges <chris.j.arges@...onical.com>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	Seth Jennings <sjenning@...hat.com>,
	Jiri Kosina <jikos@...nel.org>,
	Vojtech Pavlik <vojtech@...e.com>, linux-api@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] livepatch: old_name@..._addr scheme in livepatch sysfs directory

The following directory structure will allow for cases when the same
function name exists in a single object.
	/sys/kernel/livepatch/<patch>/<object>/<function@...ress>

An example of this issue is documented here:
	https://github.com/dynup/kpatch/issues/493

Signed-off-by: Chris J Arges <chris.j.arges@...onical.com>
---
 Documentation/ABI/testing/sysfs-kernel-livepatch | 4 ++--
 kernel/livepatch/core.c                          | 3 ++-
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-kernel-livepatch b/Documentation/ABI/testing/sysfs-kernel-livepatch
index 5bf42a8..afa0470 100644
--- a/Documentation/ABI/testing/sysfs-kernel-livepatch
+++ b/Documentation/ABI/testing/sysfs-kernel-livepatch
@@ -33,12 +33,12 @@ Description:
 		The object directory contains subdirectories for each function
 		that is patched within the object.
 
-What:		/sys/kernel/livepatch/<patch>/<object>/<function>
+What:		/sys/kernel/livepatch/<patch>/<object>/<function@...ress>
 Date:		Nov 2014
 KernelVersion:	3.19.0
 Contact:	live-patching@...r.kernel.org
 Description:
-		The function directory contains attributes regarding the
+		The function@...ress directory contains attributes regarding the
 		properties and state of the patched function.
 
 		There are currently no such attributes.
diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index 6e53441..347cb3e 100644
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -733,7 +733,8 @@ static int klp_init_func(struct klp_object *obj, struct klp_func *func)
 	func->state = KLP_DISABLED;
 
 	return kobject_init_and_add(&func->kobj, &klp_ktype_func,
-				    &obj->kobj, "%s", func->old_name);
+				    &obj->kobj, "%s@%p", func->old_name,
+				    (void *)func->old_addr);
 }
 
 /* parts of the initialization that is done only when the object is loaded */
-- 
1.9.1

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