linux-kernel - [PATCH v2 1/2] sparc32: use PUD rather than PGD to get PMD in srmmu_inherit_prom

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Message-Id: <20200627081653.25311-2-rppt@kernel.org>
Date:   Sat, 27 Jun 2020 11:16:52 +0300
From:   Mike Rapoport <rppt@...nel.org>
To:     sparclinux@...r.kernel.org
Cc:     David Miller <davem@...emloft.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Mike Rapoport <rppt@...nel.org>, linux-kernel@...r.kernel.org,
        Mike Rapoport <rppt@...ux.ibm.com>
Subject: [PATCH v2 1/2] sparc32: use PUD rather than PGD to get PMD in srmmu_inherit_prom_mappings()

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

This is a misprint in the page table traversal in
srmmu_inherit_prom_mappings`() function which accessed a PMD entry using
PGD rather than PUD.

Since sparc32 has only 3 page table levels, the PGD and PUD are
essentially the same and usage of __nocache_fix() removed the type
checking.

Use PUD for the consistency and to avoid breakage because of upcoming
addition of type checking into __nocache_fix().

Fixes: 7235db268a2777bc38 ("sparc32: use pgtable-nopud instead of 4level-fixup")
Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
---
 arch/sparc/mm/srmmu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/sparc/mm/srmmu.c b/arch/sparc/mm/srmmu.c
index 0070f8b9a753..f5fa07958f34 100644
--- a/arch/sparc/mm/srmmu.c
+++ b/arch/sparc/mm/srmmu.c
@@ -822,7 +822,7 @@ static void __init srmmu_inherit_prom_mappings(unsigned long start,
 			memset(__nocache_fix(pmdp), 0, SRMMU_PMD_TABLE_SIZE);
 			pud_set(__nocache_fix(pudp), pmdp);
 		}
-		pmdp = pmd_offset(__nocache_fix(pgdp), start);
+		pmdp = pmd_offset(__nocache_fix(pudp), start);
 		if (what == 1) {
 			*(pmd_t *)__nocache_fix(pmdp) = __pmd(probed);
 			start += PMD_SIZE;
-- 
2.26.2