linux-kernel - [PATCH] powerpc/book3e: Fix PUD allocation size in map_kernel

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Date:   Thu, 23 Jun 2022 10:56:17 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        stable@...r.kernel.org, Mike Rapoport <rppt@...nel.org>
Subject: [PATCH] powerpc/book3e: Fix PUD allocation size in map_kernel_page()

Commit 2fb4706057bc ("powerpc: add support for folded p4d page tables")
erroneously changed PUD setup to a mix of PMD and PUD. Fix it.

While at it, use PTE_TABLE_SIZE instead of PAGE_SIZE for PTE tables
in order to avoid any confusion.

Fixes: 2fb4706057bc ("powerpc: add support for folded p4d page tables")
Cc: stable@...r.kernel.org
Cc: Mike Rapoport <rppt@...nel.org>
Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/powerpc/mm/nohash/book3e_pgtable.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/mm/nohash/book3e_pgtable.c b/arch/powerpc/mm/nohash/book3e_pgtable.c
index 7d4368d055a6..b80fc4a91a53 100644
--- a/arch/powerpc/mm/nohash/book3e_pgtable.c
+++ b/arch/powerpc/mm/nohash/book3e_pgtable.c
@@ -96,8 +96,8 @@ int __ref map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot)
 		pgdp = pgd_offset_k(ea);
 		p4dp = p4d_offset(pgdp, ea);
 		if (p4d_none(*p4dp)) {
-			pmdp = early_alloc_pgtable(PMD_TABLE_SIZE);
-			p4d_populate(&init_mm, p4dp, pmdp);
+			pudp = early_alloc_pgtable(PUD_TABLE_SIZE);
+			p4d_populate(&init_mm, p4dp, pudp);
 		}
 		pudp = pud_offset(p4dp, ea);
 		if (pud_none(*pudp)) {
@@ -106,7 +106,7 @@ int __ref map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot)
 		}
 		pmdp = pmd_offset(pudp, ea);
 		if (!pmd_present(*pmdp)) {
-			ptep = early_alloc_pgtable(PAGE_SIZE);
+			ptep = early_alloc_pgtable(PTE_TABLE_SIZE);
 			pmd_populate_kernel(&init_mm, pmdp, ptep);
 		}
 		ptep = pte_offset_kernel(pmdp, ea);
-- 
2.36.1