From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>
Cc: stable@vger.kernel.org, Mike Rapoport <rppt@kernel.org>,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: [PATCH] powerpc/book3e: Fix PUD allocation size in map_kernel_page()
Date: Thu, 23 Jun 2022 10:56:17 +0200 [thread overview]
Message-ID: <95ddfd6176d53e6c85e13bd1c358359daa56775f.1655974558.git.christophe.leroy@csgroup.eu> (raw)
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@vger.kernel.org
Cc: Mike Rapoport <rppt@kernel.org>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.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
next reply other threads:[~2022-06-23 8:57 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-23 8:56 Christophe Leroy [this message]
2022-06-23 17:13 ` [PATCH] powerpc/book3e: Fix PUD allocation size in map_kernel_page() Mike Rapoport
2022-06-29 7:01 ` Michael Ellerman
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