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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/arch/sh/kernel/io_trapped.c
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@@ -1,13 +1,10 @@
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+// SPDX-License-Identifier: GPL-2.0
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 /*
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  * Trapped io support
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  *
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  * Copyright (C) 2008 Magnus Damm
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  *
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  * Intercept io operations by trapping.
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- *
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- * This file is subject to the terms and conditions of the GNU General Public
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- * License.  See the file "COPYING" in the main directory of this archive
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- * for more details.
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  */
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 #include <linux/kernel.h>
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 #include <linux/mm.h>
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@@ -102,10 +99,9 @@
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 	return 0;
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  bad:
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-	pr_warning("unable to install trapped io filter\n");
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+	pr_warn("unable to install trapped io filter\n");
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 	return -1;
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 }
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-EXPORT_SYMBOL_GPL(register_trapped_io);
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 void __iomem *match_trapped_io_handler(struct list_head *list,
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 				       unsigned long offset,
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@@ -134,11 +130,11 @@
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 	spin_unlock_irqrestore(&trapped_lock, flags);
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 	return NULL;
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 }
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-EXPORT_SYMBOL_GPL(match_trapped_io_handler);
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 static struct trapped_io *lookup_tiop(unsigned long address)
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 {
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 	pgd_t *pgd_k;
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+	p4d_t *p4d_k;
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 	pud_t *pud_k;
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 	pmd_t *pmd_k;
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 	pte_t *pte_k;
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@@ -148,7 +144,11 @@
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 	if (!pgd_present(*pgd_k))
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 		return NULL;
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-	pud_k = pud_offset(pgd_k, address);
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+	p4d_k = p4d_offset(pgd_k, address);
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+	if (!p4d_present(*p4d_k))
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+		return NULL;
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+
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+	pud_k = pud_offset(p4d_k, address);
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 	if (!pud_present(*pud_k))
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 		return NULL;
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