sparc32: fix page table traversal in srmmu_nocache_init()

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@linux.ibm.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Anatoly Pugachev <matorola@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/sparc/mm/srmmu.c b/arch/sparc/mm/srmmu.c
index e9f7af3..a8c2f26 100644 (file)
--- 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);