linux-kernel - [PATCH 03/13] livepatch: refactor klp_init

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Date:   Thu, 21 Jan 2021 08:49:49 +0100
From:   Christoph Hellwig <hch@....de>
To:     Frederic Barrat <fbarrat@...ux.ibm.com>,
        Andrew Donnellan <ajd@...ux.ibm.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Jessica Yu <jeyu@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jiri Kosina <jikos@...nel.org>,
        Miroslav Benes <mbenes@...e.cz>,
        Petr Mladek <pmladek@...e.com>,
        Joe Lawrence <joe.lawrence@...hat.com>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        dri-devel@...ts.freedesktop.org, live-patching@...r.kernel.org,
        linux-kbuild@...r.kernel.org
Subject: [PATCH 03/13] livepatch: refactor klp_init_object

Merge three calls to klp_is_module (including one hidden inside
klp_find_object_module) into a single one to simplify the code a bit.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 kernel/livepatch/core.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index f76fdb9255323d..a7f625dc24add3 100644
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -54,9 +54,6 @@ static void klp_find_object_module(struct klp_object *obj)
 {
 	struct module *mod;
 
-	if (!klp_is_module(obj))
-		return;
-
 	mutex_lock(&module_mutex);
 	/*
 	 * We do not want to block removal of patched modules and therefore
@@ -73,7 +70,6 @@ static void klp_find_object_module(struct klp_object *obj)
 	 */
 	if (mod && mod->klp_alive)
 		obj->mod = mod;
-
 	mutex_unlock(&module_mutex);
 }
 
@@ -823,15 +819,19 @@ static int klp_init_object(struct klp_patch *patch, struct klp_object *obj)
 	int ret;
 	const char *name;
 
-	if (klp_is_module(obj) && strlen(obj->name) >= MODULE_NAME_LEN)
-		return -EINVAL;
-
 	obj->patched = false;
 	obj->mod = NULL;
 
-	klp_find_object_module(obj);
+	if (klp_is_module(obj)) {
+		if (strlen(obj->name) >= MODULE_NAME_LEN)
+			return -EINVAL;
+		name = obj->name;
+
+		klp_find_object_module(obj);
+	} else {
+		name = "vmlinux";
+	}
 
-	name = klp_is_module(obj) ? obj->name : "vmlinux";
 	ret = kobject_add(&obj->kobj, &patch->kobj, "%s", name);
 	if (ret)
 		return ret;
-- 
2.29.2