[MIPS] Fix mprotect() syscall for MIPS32 w/36-bit physical address support
authorSergei Shtylyov <sshtylyov@ru.mvista.com>
Wed, 3 May 2006 18:56:43 +0000 (22:56 +0400)
committerRalf Baechle <ralf@linux-mips.org>
Mon, 5 Jun 2006 23:15:15 +0000 (00:15 +0100)
Fix mprotect() syscall for MIPS32 CPUs with 36-bit physical address
support: pte_modify() macro didn't clear the hardware page protection bits
before modifying...

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
include/asm-mips/pgtable.h

index f80fe75c780063c28805cd4ee183a2f3c0ab7e95..d0af2a3b0152f2c7d2eadae2a1f1c4b6076fa5ac 100644 (file)
@@ -353,8 +353,9 @@ static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 {
-       pte.pte_low &= _PAGE_CHG_MASK;
-       pte.pte_low |= pgprot_val(newprot);
+       pte.pte_low  &= _PAGE_CHG_MASK;
+       pte.pte_high &= ~0x3f;
+       pte.pte_low  |= pgprot_val(newprot);
        pte.pte_high |= pgprot_val(newprot) & 0x3f;
        return pte;
 }