linux-kernel - [PATCH 5.6 112/126] sparc32: fix page table traversal in srmmu_nocache

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Message-Id: <20200526183946.948924707@linuxfoundation.org>
Date:   Tue, 26 May 2020 20:54:09 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Mike Rapoport <rppt@...ux.ibm.com>,
        "David S. Miller" <davem@...emloft.net>,
        Anatoly Pugachev <matorola@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 5.6 112/126] sparc32: fix page table traversal in srmmu_nocache_init()

From: Mike Rapoport <rppt@...ux.ibm.com>

commit 0cfc8a8d70dcd51db783e8e87917e02149c71458 upstream.

The srmmu_nocache_init() uses __nocache_fix() macro to add an offset to
page table entry to access srmmu_nocache_pool.

But since sparc32 has only three actual page table levels, pgd, p4d and
pud are essentially the same thing and pgd_offset() and p4d_offset() are
no-ops, the __nocache_fix() should be done only at PUD level.

Remove __nocache_fix() for p4d_offset() and pud_offset() and keep it
only for PUD and lower levels.

Fixes: c2bc26f7ca1f ("sparc32: use PUD rather than PGD to get PMD in srmmu_nocache_init()")
Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
Cc: David S. Miller <davem@...emloft.net>
Cc: Anatoly Pugachev <matorola@...il.com>
Cc: <stable@...r.kernel.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/sparc/mm/srmmu.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/sparc/mm/srmmu.c
+++ b/arch/sparc/mm/srmmu.c
@@ -331,8 +331,8 @@ static void __init srmmu_nocache_init(vo

 	while (vaddr < srmmu_nocache_end) {
 		pgd = pgd_offset_k(vaddr);
-		p4d = p4d_offset(__nocache_fix(pgd), vaddr);
-		pud = pud_offset(__nocache_fix(p4d), vaddr);
+		p4d = p4d_offset(pgd, vaddr);
+		pud = pud_offset(p4d, vaddr);
 		pmd = pmd_offset(__nocache_fix(pud), vaddr);
 		pte = pte_offset_kernel(__nocache_fix(pmd), vaddr);