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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/samples/livepatch/livepatch-shadow-fix2.c
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@@ -1,18 +1,6 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * Copyright (C) 2017 Joe Lawrence <joe.lawrence@redhat.com>
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License
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- * as published by the Free Software Foundation; either version 2
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- * of the License, or (at your option) any later version.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, see <http://www.gnu.org/licenses/>.
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  */
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 /*
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@@ -50,7 +38,7 @@
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 	unsigned long jiffies_expire;
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 };
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-bool livepatch_fix2_dummy_check(struct dummy *d, unsigned long jiffies)
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+static bool livepatch_fix2_dummy_check(struct dummy *d, unsigned long jiffies)
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 {
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 	int *shadow_count;
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@@ -71,16 +59,16 @@
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 static void livepatch_fix2_dummy_leak_dtor(void *obj, void *shadow_data)
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 {
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 	void *d = obj;
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-	void **shadow_leak = shadow_data;
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+	int **shadow_leak = shadow_data;
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 	kfree(*shadow_leak);
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 	pr_info("%s: dummy @ %p, prevented leak @ %p\n",
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 			 __func__, d, *shadow_leak);
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 }
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-void livepatch_fix2_dummy_free(struct dummy *d)
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+static void livepatch_fix2_dummy_free(struct dummy *d)
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 {
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-	void **shadow_leak;
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+	int **shadow_leak;
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 	int *shadow_count;
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 	/* Patch: copy the memory leak patch from the fix1 module. */
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@@ -129,25 +117,13 @@
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 static int livepatch_shadow_fix2_init(void)
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 {
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-	int ret;
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-
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-	ret = klp_register_patch(&patch);
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-	if (ret)
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-		return ret;
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-	ret = klp_enable_patch(&patch);
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-	if (ret) {
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-		WARN_ON(klp_unregister_patch(&patch));
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-		return ret;
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-	}
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-	return 0;
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+	return klp_enable_patch(&patch);
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 }
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 static void livepatch_shadow_fix2_exit(void)
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 {
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 	/* Cleanup any existing SV_COUNTER shadow variables */
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 	klp_shadow_free_all(SV_COUNTER, NULL);
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-
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-	WARN_ON(klp_unregister_patch(&patch));
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 }
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 module_init(livepatch_shadow_fix2_init);