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

Souptick Joarder
2018-11-19T15:09:45Z

Hi Mike,

On Sat, Nov 17, 2018 at 8:07 PM Matthew Wilcox <willy@infradead.org> 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@linux.ibm.com> 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.
* Return - int error value
* 0 - OK
* -EINVAL - Invalid argument
* -ENOMEM - No memory
* -EFAULT - Bad address
* -EBUSY - Device or resource busy
*/