X-Git-Url: http://git.cascardo.info/?a=blobdiff_plain;f=arch%2Fpowerpc%2Fmm%2Fhugetlbpage.c;h=a5d3ecdabc44464e995c9a785e515359d43d4217;hb=07021b43597f506cc525d139ed1a94e79cf184f2;hp=7372ee13eb1e43e6bcf7cd955b01452dbc696add;hpb=b22734a55067adbc10216e459762dbd7dcef29d5;p=cascardo%2Flinux.git

diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index 7372ee13eb1e..a5d3ecdabc44 100644
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -1019,8 +1019,15 @@ int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr,
 
 	pte = READ_ONCE(*ptep);
 	mask = _PAGE_PRESENT | _PAGE_READ;
+
+	/*
+	 * On some CPUs like the 8xx, _PAGE_RW hence _PAGE_WRITE is defined
+	 * as 0 and _PAGE_RO has to be set when a page is not writable
+	 */
 	if (write)
 		mask |= _PAGE_WRITE;
+	else
+		mask |= _PAGE_RO;
 
 	if ((pte_val(pte) & mask) != mask)
 		return 0;