[PATCH mmotm] mm: page_mkwrite change prototype to match fault: fix sysfs

[PATCH mmotm] mm: page_mkwrite change prototype to match fault: fix sysfs

[Hugh Dickins]

Fix warnings and return values in sysfs bin_page_mkwrite(), fixing
fs/sysfs/bin.c: In function `bin_page_mkwrite':
fs/sysfs/bin.c:250: warning: passing argument 2 of `bb->vm_ops->page_mkwrite' from incompatible pointer type
fs/sysfs/bin.c: At top level:
fs/sysfs/bin.c:280: warning: initialization from incompatible pointer type

Signed-off-by: Hugh Dickins <hugh@veritas.com>
---
To follow mm-page_mkwrite-change-prototype-to-match-fault.patch
Expects to have my [PATCH next] sysfs: fix some bin_vm_ops errors

 fs/sysfs/bin.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- next/fs/sysfs/bin.c	2009-03-21 18:01:26.000000000 +0000
+++ mmotm/fs/sysfs/bin.c	2009-03-21 18:28:51.000000000 +0000
@@ -234,7 +234,7 @@ static int bin_fault(struct vm_area_stru
 	return ret;
 }
 
-static int bin_page_mkwrite(struct vm_area_struct *vma, struct page *page)
+static int bin_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
 {
 	struct file *file = vma->vm_file;
 	struct bin_buffer *bb = file->private_data;
@@ -242,15 +242,15 @@ static int bin_page_mkwrite(struct vm_ar
 	int ret;
 
 	if (!bb->vm_ops)
-		return -EINVAL;
+		return VM_FAULT_SIGBUS;
 
 	if (!bb->vm_ops->page_mkwrite)
 		return 0;
 
 	if (!sysfs_get_active_two(attr_sd))
-		return -EINVAL;
+		return VM_FAULT_SIGBUS;
 
-	ret = bb->vm_ops->page_mkwrite(vma, page);
+	ret = bb->vm_ops->page_mkwrite(vma, vmf);
 
 	sysfs_put_active_two(attr_sd);
 	return ret;

Re: [PATCH mmotm] mm: page_mkwrite change prototype to match fault: fix sysfs

[Eric Biederman]

On Sun, Mar 22, 2009 at 11:36 AM, Hugh Dickins <hugh@veritas.com> wrote:
> Fix warnings and return values in sysfs bin_page_mkwrite(), fixing
> fs/sysfs/bin.c: In function `bin_page_mkwrite':
> fs/sysfs/bin.c:250: warning: passing argument 2 of `bb->vm_ops->page_mkwrite' from incompatible pointer type
> fs/sysfs/bin.c: At top level:
> fs/sysfs/bin.c:280: warning: initialization from incompatible pointer type

In general this looks reasonable.  It appears that linux-next has
changed the prototype
of page_mkwrite.    Which is why I did not see this failure mode.