[POWERPC] spufs: map mmio space as guarded into user space

This fixes a bug where we don't properly map SPE MMIO space as guarded,
causing various test cases to fail, probably due to write combining and other
niceties caused by the lack of the G bit.
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

arch/powerpc/platforms/cell/spufs/file.c

@@ -204,7 +204,7 @@ static int spufs_cntl_mmap(struct file *file, struct vm_area_struct *vma)
 
 	vma->vm_flags |= VM_RESERVED;
 	vma->vm_page_prot = __pgprot(pgprot_val(vma->vm_page_prot)
-				     | _PAGE_NO_CACHE);
+				     | _PAGE_NO_CACHE | _PAGE_GUARDED);
 
 	vma->vm_ops = &spufs_cntl_mmap_vmops;
 	return 0;
@@ -675,7 +675,7 @@ static int spufs_signal1_mmap(struct file *file, struct vm_area_struct *vma)
 
 	vma->vm_flags |= VM_RESERVED;
 	vma->vm_page_prot = __pgprot(pgprot_val(vma->vm_page_prot)
-				     | _PAGE_NO_CACHE);
+				     | _PAGE_NO_CACHE | _PAGE_GUARDED);
 
 	vma->vm_ops = &spufs_signal1_mmap_vmops;
 	return 0;
@@ -762,7 +762,7 @@ static int spufs_signal2_mmap(struct file *file, struct vm_area_struct *vma)
 	/* FIXME: */
 	vma->vm_flags |= VM_RESERVED;
 	vma->vm_page_prot = __pgprot(pgprot_val(vma->vm_page_prot)
-				     | _PAGE_NO_CACHE);
+				     | _PAGE_NO_CACHE | _PAGE_GUARDED);
 
 	vma->vm_ops = &spufs_signal2_mmap_vmops;
 	return 0;
@@ -850,7 +850,7 @@ static int spufs_mss_mmap(struct file *file, struct vm_area_struct *vma)
 
 	vma->vm_flags |= VM_RESERVED;
 	vma->vm_page_prot = __pgprot(pgprot_val(vma->vm_page_prot)
-				     | _PAGE_NO_CACHE);
+				     | _PAGE_NO_CACHE | _PAGE_GUARDED);
 
 	vma->vm_ops = &spufs_mss_mmap_vmops;
 	return 0;
@@ -899,7 +899,7 @@ static int spufs_mfc_mmap(struct file *file, struct vm_area_struct *vma)
 
 	vma->vm_flags |= VM_RESERVED;
 	vma->vm_page_prot = __pgprot(pgprot_val(vma->vm_page_prot)
-				     | _PAGE_NO_CACHE);
+				     | _PAGE_NO_CACHE | _PAGE_GUARDED);
 
 	vma->vm_ops = &spufs_mfc_mmap_vmops;
 	return 0;