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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>
CC:     Marcin Nowakowski <marcin.nowakowski@imgtec.com>,
        "linux-mips@linux-mips.org" <linux-mips@linux-mips.org>,
        Ralf Baechle <ralf@linux-mips.org>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.4 135/167] MIPS: mm: fixed mappings: correct
 initialisation
Thread-Topic: [PATCH AUTOSEL for 4.4 135/167] MIPS: mm: fixed mappings:
 correct initialisation
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Date:   Mon, 19 Mar 2018 16:08:12 +0000
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From: Marcin Nowakowski <marcin.nowakowski@imgtec.com>

[ Upstream commit 71eb989ab5a110df8bcbb9609bacde73feacbedd ]

fixrange_init operates at PMD-granularity and expects the addresses to
be PMD-size aligned, but currently that might not be the case for
PKMAP_BASE unless it is defined properly, so ensure a correct alignment
is used before passing the address to fixrange_init.

fixed mappings: only align the start address that is passed to
fixrange_init rather than the value before adding the size, as we may
end up with uninitialised upper part of the range.

Signed-off-by: Marcin Nowakowski <marcin.nowakowski@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/15948/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 arch/mips/mm/pgtable-32.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/mips/mm/pgtable-32.c b/arch/mips/mm/pgtable-32.c
index adc6911ba748..b19a3c506b1e 100644
--- a/arch/mips/mm/pgtable-32.c
+++ b/arch/mips/mm/pgtable-32.c
@@ -51,15 +51,15 @@ void __init pagetable_init(void)
 	/*
 	 * Fixed mappings:
 	 */
-	vaddr =3D __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
-	fixrange_init(vaddr, vaddr + FIXADDR_SIZE, pgd_base);
+	vaddr =3D __fix_to_virt(__end_of_fixed_addresses - 1);
+	fixrange_init(vaddr & PMD_MASK, vaddr + FIXADDR_SIZE, pgd_base);
=20
 #ifdef CONFIG_HIGHMEM
 	/*
 	 * Permanent kmaps:
 	 */
 	vaddr =3D PKMAP_BASE;
-	fixrange_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
+	fixrange_init(vaddr & PMD_MASK, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
=20
 	pgd =3D swapper_pg_dir + __pgd_offset(vaddr);
 	pud =3D pud_offset(pgd, vaddr);
--=20
2.14.1