[MIPS] Fix mprotect() syscall for MIPS32 w/36-bit physical address support 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 <[e-mail]> Signed-off-by: Ralf Baechle <[e-mail]>

include/asm-mips/pgtable.h

···
 #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;
 }