Re: [Xen-devel] [PATCH 1/9] mm: Introduce new vm_insert_range API

[Mike Rapoport <rppt@xxxxxxxxxxxxx>]

On Mon, Nov 19, 2018 at 08:43:09PM +0530, Souptick Joarder wrote:
> Hi Mike,
> 
> On Sat, Nov 17, 2018 at 8:07 PM Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote:
> >
> > On Sat, Nov 17, 2018 at 12:26:38PM +0530, Souptick Joarder wrote:
> > > On Fri, Nov 16, 2018 at 11:59 PM Mike Rapoport <rppt@xxxxxxxxxxxxx> wrote:
> > > > > + * vm_insert_range - insert range of kernel pages into user vma
> > > > > + * @vma: user vma to map to
> > > > > + * @addr: target user address of this page
> > > > > + * @pages: pointer to array of source kernel pages
> > > > > + * @page_count: no. of pages need to insert into user vma
> > > > > + *
> > > > > + * This allows drivers to insert range of kernel pages they've 
> > > > > allocated
> > > > > + * into a user vma. This is a generic function which drivers can use
> > > > > + * rather than using their own way of mapping range of kernel pages 
> > > > > into
> > > > > + * user vma.
> > > >
> > > > Please add the return value and context descriptions.
> > > >
> > >
> > > Sure I will wait for some time to get additional review comments and
> > > add all of those requested changes in v2.
> >
> > You could send your proposed wording now which might remove the need
> > for a v3 if we end up arguing about the wording.
> 
> Does this description looks good ?
> 
> /**
>  * vm_insert_range - insert range of kernel pages into user vma
>  * @vma: user vma to map to
>  * @addr: target user address of this page
>  * @pages: pointer to array of source kernel pages
>  * @page_count: number of pages need to insert into user vma
>  *
>  * This allows drivers to insert range of kernel pages they've allocated
>  * into a user vma. This is a generic function which drivers can use
>  * rather than using their own way of mapping range of kernel pages into
>  * user vma.
>  *
>  * Context - Process context. Called by mmap handlers.

Context:

>  * Return - int error value

Return:

>  * 0                    - OK
>  * -EINVAL              - Invalid argument
>  * -ENOMEM              - No memory
>  * -EFAULT              - Bad address
>  * -EBUSY               - Device or resource busy

I don't think that elaborate description of error values is needed, just "0
on success and error code otherwise" would be sufficient.

>  */
> 

-- 
Sincerely yours,
Mike.


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