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From: Mike Rapoport <>
To: Linus Torvalds <>
Cc: Andrew Morton <>,
	David Miller <>, Linux-MM <>,
	kernel test robot <>,
	Anatoly Pugachev <>,, stable <>,
	Mike Rapoport <>
Subject: [PATCH] sparc32: fix page table traversal in srmmu_nocache_init()
Date: Sat, 23 May 2020 22:57:18 +0300
Message-ID: <> (raw)

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 <>
Cc: David S. Miller <>
Cc: Anatoly Pugachev <>
Cc: <>
 arch/sparc/mm/srmmu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/sparc/mm/srmmu.c b/arch/sparc/mm/srmmu.c
index e9f7af32da07..a8c2f2615fc6 100644
--- a/arch/sparc/mm/srmmu.c
+++ b/arch/sparc/mm/srmmu.c
@@ -331,8 +331,8 @@ static void __init srmmu_nocache_init(void)
 	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);

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Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-23 19:57 Mike Rapoport [this message]
2020-05-23 21:00 ` Linus Torvalds

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