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2023-12-11 1f93a7dfd1f8d5ff7a5c53246c7534fe2332d6f4

 kernel/arch/arm/mm/pgd.c
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@@ -1,11 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  *  linux/arch/arm/mm/pgd.c
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  *
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  *  Copyright (C) 1998-2005 Russell King
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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  */
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 #include <linux/mm.h>
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 #include <linux/gfp.h>
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@@ -33,6 +30,7 @@
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 pgd_t *pgd_alloc(struct mm_struct *mm)
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 {
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 	pgd_t *new_pgd, *init_pgd;
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+	p4d_t *new_p4d, *init_p4d;
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 	pud_t *new_pud, *init_pud;
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 	pmd_t *new_pmd, *init_pmd;
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 	pte_t *new_pte, *init_pte;
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@@ -56,8 +54,12 @@
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 	/*
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 	 * Allocate PMD table for modules and pkmap mappings.
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 	 */
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-	new_pud = pud_alloc(mm, new_pgd + pgd_index(MODULES_VADDR),
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+	new_p4d = p4d_alloc(mm, new_pgd + pgd_index(MODULES_VADDR),
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 			    MODULES_VADDR);
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+	if (!new_p4d)
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+		goto no_p4d;
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+
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+	new_pud = pud_alloc(mm, new_p4d, MODULES_VADDR);
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 	if (!new_pud)
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 		goto no_pud;
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@@ -72,7 +74,11 @@
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 		 * contains the machine vectors. The vectors are always high
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 		 * with LPAE.
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 		 */
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-		new_pud = pud_alloc(mm, new_pgd, 0);
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+		new_p4d = p4d_alloc(mm, new_pgd, 0);
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+		if (!new_p4d)
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+			goto no_p4d;
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+
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+		new_pud = pud_alloc(mm, new_p4d, 0);
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 		if (!new_pud)
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 			goto no_pud;
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@@ -94,7 +100,8 @@
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 		pmd_val(*new_pmd) |= PMD_DOMAIN(DOMAIN_VECTORS);
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 #endif
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-		init_pud = pud_offset(init_pgd, 0);
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+		init_p4d = p4d_offset(init_pgd, 0);
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+		init_pud = pud_offset(init_p4d, 0);
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 		init_pmd = pmd_offset(init_pud, 0);
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 		init_pte = pte_offset_map(init_pmd, 0);
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 		set_pte_ext(new_pte + 0, init_pte[0], 0);
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@@ -111,6 +118,8 @@
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 no_pmd:
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 	pud_free(mm, new_pud);
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 no_pud:
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+	p4d_free(mm, new_p4d);
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+no_p4d:
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 	__pgd_free(new_pgd);
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 no_pgd:
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 	return NULL;
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@@ -119,6 +128,7 @@
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 void pgd_free(struct mm_struct *mm, pgd_t *pgd_base)
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 {
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 	pgd_t *pgd;
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+	p4d_t *p4d;
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 	pud_t *pud;
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 	pmd_t *pmd;
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 	pgtable_t pte;
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@@ -130,7 +140,11 @@
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 	if (pgd_none_or_clear_bad(pgd))
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 		goto no_pgd;
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-	pud = pud_offset(pgd, 0);
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+	p4d = p4d_offset(pgd, 0);
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+	if (p4d_none_or_clear_bad(p4d))
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+		goto no_p4d;
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+
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+	pud = pud_offset(p4d, 0);
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 	if (pud_none_or_clear_bad(pud))
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 		goto no_pud;
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@@ -147,8 +161,11 @@
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 	pmd_free(mm, pmd);
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 	mm_dec_nr_pmds(mm);
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 no_pud:
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-	pgd_clear(pgd);
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+	p4d_clear(p4d);
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 	pud_free(mm, pud);
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+no_p4d:
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+	pgd_clear(pgd);
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+	p4d_free(mm, p4d);
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 no_pgd:
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 #ifdef CONFIG_ARM_LPAE
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 	/*
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@@ -159,15 +176,21 @@
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 			continue;
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 		if (pgd_val(*pgd) & L_PGD_SWAPPER)
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 			continue;
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-		pud = pud_offset(pgd, 0);
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+		p4d = p4d_offset(pgd, 0);
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+		if (p4d_none_or_clear_bad(p4d))
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+			continue;
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+		pud = pud_offset(p4d, 0);
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 		if (pud_none_or_clear_bad(pud))
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 			continue;
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 		pmd = pmd_offset(pud, 0);
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 		pud_clear(pud);
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 		pmd_free(mm, pmd);
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 		mm_dec_nr_pmds(mm);
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-		pgd_clear(pgd);
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+		p4d_clear(p4d);
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 		pud_free(mm, pud);
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+		mm_dec_nr_puds(mm);
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+		pgd_clear(pgd);
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+		p4d_free(mm, p4d);
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 	}
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 #endif
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 	__pgd_free(pgd_base);